##### Table of Contents

##### Index to Financial Statements

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.
20549

FORM 10-K



|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the year ended December 31, 2009

Or



| ̈ | TRANSITION REPORT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | -------------------------------------------------------------------------------

For the transition period from             to

Commission File No. 333-85994-01

MEWBOURNE ENERGY PARTNERS 03-A, L.P.



|                                                         |  |                                        
|-------------------------------------------------------- |  | ---------------------------------------
|Delaware                                                 |  | 27-0055431                             
|(State or jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification Number)



|                                         |  |           
|---------------------------------------- |  | ----------
|3901 South Broadway, Tyler, Texas        |  | 75701     
|(Address of principal executive offices) |  | (Zip code)

Registrants Telephone Number, including area code: (903) 561-2900

Securities registered pursuant
to Section 12(b) of the Act: None.

Securities registered pursuant to section 12(g) of the Act:

Limited Partner Interests

(Title of class)

General Partner Interests

(Title of class)

Indicate
by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes   ̈    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to
Section 13 or 15(d) of the Act.    Yes   ̈    No  x

Note: Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15 (d) of the Exchange Act
from their obligations under those Sections.

Indicate by check mark whether the registrant (1) has filed all reports required to be
filed by Section 13 of 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for
the past 90 days.    Yes  x    No   ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to
the best of the registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    x

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every
Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes   ̈    No   ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of large accelerated
filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act. (Check one):



|                        |  |                                                  |  |                           |  |  
|----------------------- |  | ------------------------------------------------ |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈                                                |  | Accelerated filer         |  |  ̈
|                        |  |                                                  | 
|Non-accelerated filer   |  |  ̈  (Do not check if a smaller reporting company) |  | Smaller reporting company |  | x

Indicate by check mark if the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes   ̈    No  x

No market currently exists for the limited partner interests of the Registrant. Based on original
purchase price the aggregate market value of limited and general partner interests owned by non-affiliates of the Registrant is $18,000,000.

The following documents are incorporated by reference into the indicated parts of this Annual Report on Form 10-K: Part of the information called for by Part IV of the Annual Report on Form 10-K is incorporated by reference from the
Registrants Registration Statement on Form S-1, File No. 333-85994-01.



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##### Index to Financial Statements

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

INDEX



|                                             |  |                                                                                       |  |   
|-------------------------------------------- |  | ------------------------------------------------------------------------------------- |  | --
|Part I                                       |  | 3                                                                                    
|                                             |  |                                                                                      
|Item 1.                                      |  | Business                                                                              |  | 3 
|                                             |  |                                                                                      
|Item 1A.                                     |  | Risk Factors                                                                          |  | 4 
|                                             |  |                                                                                      
|Item 1B.                                     |  | Unresolved Staff Comments                                                             |  | 6 
|                                             |  |                                                                                      
|Item 2.                                      |  | Properties                                                                            |  | 6 
|                                             |  |                                                                                      
|Item 3.                                      |  | Legal Proceedings                                                                     |  | 7 
|                                             |  |                                                                                      
|Item 4.                                      |  | Reserved for Future Use                                                               |  | 7 
|                                             | 
|Part II                                      |  | 8                                                                                    
|                                             |  |                                                                                      
|Item 5.                                      |  | Market for Registrants Common Equity and Related Stockholder Matters                 |  | 8 
|                                             |  |                                                                                      
|Item 6.                                      |  | Selected Financial Data                                                               |  | 8 
|                                             |  |                                                                                      
|Item 7.                                      |  | Managements Discussion and Analysis of Financial Condition and Results of Operations |  | 8 
|                                             |  |                                                                                      
|Item 7A.                                     |  | Quantitive and Qualitative Disclosures about Market Risk                              |  | 13
|                                             |  |                                                                                      
|Item 8.                                      |  | Financial Statements and Supplementary Data                                           |  | 13
|                                             |  |                                                                                      
|Item 9.                                      |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure  |  | 13
|                                             |  |                                                                                      
|Item 9A.                                     |  | Controls and Procedures                                                               |  | 13
|                                             | 
|Part III                                     |  | 14                                                                                   
|                                             |  |                                                                                      
|Item 10.                                     |  | Directors and Executive Officers of the Registrant                                    |  | 14
|                                             |  |                                                                                      
|Item 11.                                     |  | Executive Compensation                                                                |  | 15
|                                             |  |                                                                                      
|Item 12.                                     |  | Security Ownership of Certain Beneficial Owners and Management                        |  | 15
|                                             |  |                                                                                      
|Item 13.                                     |  | Certain Relationships and Related Transactions                                        |  | 16
|                                             |  |                                                                                      
|Item 14.                                     |  | Principal Accountant Fees and Services                                                |  | 16
|                                             | 
|Part IV                                      |  | 17                                                                                   
|                                             |  |                                                                                      
|Item 15.                                     |  | Exhibits, Financial Statements, Financial Statement Schedules and Reports on Form 8K  |  | 17
|                                             | 
|SIGNATURES                                   |  | 18                                                                                   
|                                             | 
|INDEX TO EXHIBITS                            |  | 31                                                                                   
|                                             | 
|Certification of CEO Pursuant to Section 302 |  |                                                                                      
|                                             | 
|Certification of CFO Pursuant to Section 302 |  |                                                                                      
|                                             | 
|Certification of CEO Pursuant to Section 906 |  |                                                                                      
|                                             | 
|Certification of CFO Pursuant to Section 906 |  |                                                                                      
|                                             | 
|Report of Forrest A. Garb & Associates, Inc. |  |                                                                                      



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##### Index to Financial Statements

PART I



|ITEM 1. | Business
|------- | --------

Mewbourne Energy Partners 03-A,
L.P. (the Registrant or the Partnership) is a limited partnership organized under the laws of the State of Delaware on February 19, 2003 (date of inception). Mewbourne Development Corporation (MD), a Delaware
Corporation, has been appointed as the Registrants managing general partner. MD has no significant equity interest in the Registrant.

A
Registration Statement was filed pursuant to the Securities Act of 1933, as amended, registering limited and general partnership interests in a series of two Delaware limited partnerships formed under Mewbourne Energy 02-03 Drilling Programs.
General and limited partnership interests were offered at $1,000 each. The maximum offering amount was $18,000,000 (18,000 interests) per partnership. The Registration Statement was declared effective by the Securities and Exchange Commission on
May 16, 2003. On July 9, 2003, the offering of limited and general partnership interests in the Registrant was closed, with interests aggregating $18,000,000 originally being sold to 710 subscribers of which $16,107,005 were sold to 644
subscribers as general partner interests and $1,892,995 were sold to 66 subscribers as limited partner interests.

The Registrant engages
primarily in oil and gas development and production and is not involved in any other industry segment. See the financial statements in Item 8 of this report for a summary of the Registrants revenue, income and identifiable assets.

The sale of crude oil and natural gas produced by the Registrant will be affected by a number of factors that are beyond the
Registrants control. These factors include the price of crude oil and natural gas, the fluctuating supply of and demand for these products, competitive fuels, refining, transportation, extensive federal and state regulations governing the
production and sale of crude oil and natural gas, and other competitive conditions. It is impossible to predict with any certainty the future effect of these factors on the Registrant.

The market for crude oil is such that the Registrant anticipates it will be able to sell all the crude oil it can produce. Natural gas will be sold to local distribution companies, gas marketers and end
users on the spot market. The spot market reflects immediate sales of natural gas without long-term contractual commitments. The future market condition for natural gas cannot be predicted with any certainty, and the Registrant may experience delays
in marketing natural gas production and fluctuations in natural gas prices.

Many aspects of the Registrants activities are highly
competitive including, but not limited to, the acquisition of suitable drilling prospects and the procurement of drilling and related oil field equipment, and are subject to governmental regulation, both at Federal and state levels. The
Registrants ability to compete depends on its financial resources and on the managing general partners staff and facilities, none of which are significant in comparison with those of the oil and gas exploration, development and
production industry as a whole. Federal and state regulation of oil and gas operations generally includes drilling and spacing of wells on producing acreage, the imposition of maximum allowable production rates, the taxation of income and other
items, and the protection of the environment.

The Registrant does not have any employees of its own. MD is responsible for all management
functions. Mewbourne Oil Company (MOC), a wholly owned subsidiary of Mewbourne Holdings, Inc., which is also the parent of the Registrants managing general partner, has been appointed Program Manager and is responsible for
activities in accordance with a Drilling Program Agreement entered into by the Registrant, MD and MOC. At March 31, 2010, MOC employed 231 persons, many of whom dedicated a part of their time to the conduct of the Registrants business
during the period for which this report is filed.



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##### Index to Financial Statements

The production of oil and gas is not considered subject to seasonal factors although the price received by
the Registrant for natural gas sales will generally tend to increase during the winter months. Order backlog is not pertinent to the Registrants business.



|ITEM 1A. | Risk Factors
|-------- | ------------

Oil and natural gas
prices are volatile. A decline in prices could adversely affect the Registrants financial position, financial results, and cash flows.

Revenues, operating results, and profitability depend primarily upon the prices received for oil and natural gas sales. Prices also affect the amount of cash flow available for distribution. In addition, cost ceiling write-downs may be
necessary in the future if prices fall significantly.

Historically, the markets for oil and natural gas have been volatile and they are
likely to continue to be volatile. Wide fluctuations in oil and natural gas prices may result from relatively minor changes in the supply of and demand for oil and natural gas, market uncertainty and other factors that are beyond the
Registrants control, including:



| |  |  | worldwide and domestic supplies of oil and natural gas;
| | - |  | -------------------------------------------------------



| |  |  | weather conditions;
| | - |  | -------------------



| |  |  | the level of consumer demand;
| | - |  | -----------------------------



| |  |  | the price and availability of alternative fuels;
| | - |  | ------------------------------------------------



| |  |  | the proximity and capacity of natural gas pipelines and other transportation facilities;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | the price and level of foreign imports;
| | - |  | ---------------------------------------



| |  |  | domestic and foreign governmental regulations and taxes;
| | - |  | --------------------------------------------------------



| |  |  | the ability of the members of the Organization of Petroleum Exporting Countries to agree to and maintain oil price and production controls;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | political instability or armed conflict in oil-producing regions; and
| | - |  | ---------------------------------------------------------------------



| |  |  | overall domestic and global economic conditions.
| | - |  | ------------------------------------------------

These factors and the volatility of the energy markets make it extremely difficult to predict future oil and natural gas price movements with any certainty. Declines in oil and natural gas prices would
not only reduce revenue, but could reduce the amount of oil and natural gas that can be produced economically and, as a result, could have a material adverse effect on the Registrants financial condition, results of operations and reserves.
Further, oil and natural gas prices do not necessarily move in tandem. Because approximately 78% of the Registrants reserves at December 31, 2009 were natural gas reserves, the Registrant is more affected by movements in natural gas
prices.

The actual quantities and present value of proved reserves may prove to be lower than estimated.

This report contains estimates of proved reserves. These estimates are based upon various assumptions, including assumptions required by the SEC relating to
oil and natural gas prices, drilling and operating expenses, capital expenditures, taxes and availability of funds. The process of estimating oil and natural gas reserves is complex. The process involves significant decisions and assumptions in the
evaluation of available geological, geophysical, engineering and economic data for each reservoir. Therefore, these estimates are inherently imprecise.

Actual future production, oil and natural gas prices, revenues, taxes, development expenditures, operating expenses and quantities of recoverable oil and natural gas reserves most likely will vary from
these estimates. Such variations may be significant and could materially affect the estimated quantities and present value of proved reserves. In addition, the Registrant may adjust estimates of proved reserves to reflect production history, results
of exploration and development drilling, prevailing oil and natural gas prices and other factors, many of which are beyond the Registrants control. The Registrants properties may also be susceptible to hydrocarbon drainage from
production by operators on adjacent properties.



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##### Index to Financial Statements

The December 31, 2009 proved reserves estimates presented in this report have been prepared using new
SEC disclosure rules that differ in a number of respects from prior rules. As a result of changes in the reporting rules, reserve estimates beginning with December 31, 2009 will not be directly comparable to the Partnerships previously
reported reserves. Under the prior SEC rules, reserve valuation at December 31, 2009 would be 58,295 barrels of oil and 3,280,389 mcf of gas, as compared to 54,164 barrels and 2,798,121 mcf under the new rules.

The SEC has not reviewed any reporting entitys reserve estimates under the new rules and has released only limited interpretive guidance regarding
reporting of reserve estimates under the new rules. Accordingly, while the estimates of proved reserves at December 31, 2009 included in this report have been prepared based on what the Partnership and the Partnerships independent reserve
engineers believe to be reasonable interpretations of the new SEC rules, those estimates could differ materially from any estimates we might prepare applying more specific SEC interpretive guidance.

Future price declines may result in a write-down of asset carrying values.

The Registrant utilizes the full-cost method of accounting for costs related to oil and natural gas properties. Under this method, all such costs (for both productive and nonproductive properties) are
capitalized and amortized on an aggregate basis over the estimated lives of the properties using the unit-of-production method. However, these capitalized costs are subject to a ceiling test which limits such pooled costs to the aggregate of the
present value of future net revenues attributable to proved oil and natural gas reserves discounted at 10% plus the lower of cost or market value of unproved properties. The full-cost ceiling is evaluated at the end of each quarter using the oil and
gas pricing guidelines established by the Securities and Exchange Commission. A significant decline in oil and natural gas prices from current levels, or other factors, without other mitigating circumstances, could cause a future write-down of
capitalized costs and a non-cash charge against future earnings.

The Registrants ceiling test calculations during the year ended
December 31, 2009 indicated an impairment of oil and natural gas properties of approximately $3.1 million.

Oil and natural gas drilling
and producing operations can be hazardous and may expose the Registrant to environmental liabilities.

Oil and natural gas operations are
subject to many risks, including well blowouts, cratering and explosions, pipe failure, fires, formations with abnormal pressures, uncontrollable flows of oil, natural gas, brine or well fluids, and other environmental hazards and risks. If any of
these risks occurs, the Registrant could sustain substantial losses as a result of:



| |  |  | injury or loss of life;
| | - |  | -----------------------



| |  |  | severe damage to or destruction of property, natural resources and equipment;
| | - |  | -----------------------------------------------------------------------------



| |  |  | pollution or other environmental damage;
| | - |  | ----------------------------------------



| |  |  | clean-up responsibilities;
| | - |  | --------------------------



| |  |  | regulatory investigations and administrative, civil and criminal penalties; and
| | - |  | -------------------------------------------------------------------------------



| |  |  | injunctions resulting in limitation or suspension of operations.
| | - |  | ----------------------------------------------------------------



5



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##### Index to Financial Statements

There is inherent risk of incurring significant environmental costs and liabilities in exploration and
production operations due to generation, handling, and disposal of materials, including wastes and petroleum hydrocarbons. The Registrant may incur joint and several, strict liability under applicable U.S. federal and state environmental laws in
connection with releases of petroleum hydrocarbons and wastes on, under or from leased or owned properties, some of which have been used for oil and natural gas exploration and production activities for a number of years, often by third parties not
under the Registrants control. While the Registrant maintains insurance against some, but not all, of the risks described above, the Registrants insurance may not be adequate to cover casualty losses or liabilities. Also, in the future
the Registrant may not be able to obtain insurance at premium levels that justify its purchase.

In addition, in response to studies
suggesting that emissions of certain gases may be contributing to warming of the earths atmosphere, many states are beginning to consider initiatives to track and record these gases, generally referred to as greenhouse gases, with
several states having already adopted regulatory initiatives aimed at reducing emissions of greenhouse gases. Methane, a primary component of natural gas, and carbon dioxide, a byproduct of the burning of natural gas, are included among the types of
gases targeted by greenhouse gas initiatives and laws. This movement is in its infancy but regulatory initiatives or legislation placing restrictions on emissions of methane or carbon dioxide that may be imposed in various states of the United
States could adversely affect operations of oil and gas wells and the demand for oil and gas products.



|ITEM 1B. | Unresolved Staff Comments
|-------- | -------------------------

None.



|ITEM 2. | Properties
|------- | ----------

Property Interests

The Registrants properties consist primarily of interests in properties on which oil and gas wells are located. Such property interests
are often subject to landowner royalties, overriding royalties and other oil and gas leasehold interests.

Fractional working interests in
developmental oil and gas prospects, located primarily in the Anadarko Basin of Western Oklahoma, the Texas Panhandle, and the Permian Basin of New Mexico and West Texas, were acquired by the Registrant, resulting in the Registrants
participation in the drilling of oil and gas wells. At December 31, 2009, the Registrant owned working interests in sixty-seven producing wells. The Registrant had no drilling activity for the years ended December 31, 2009 and 2008.



6



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##### Index to Financial Statements

Third Party Review of Reserves Estimate

The reserves estimate shown herein has been independently evaluated by Forrest A. Garb & Associates, Inc. Their reserves estimate is filed with this report as Exhibit 99.1. The qualifications of
William Donald Harris III, P.E., the technical person primarily responsible for overseeing his firms preparation of the Partnerships reserve estimates are set forth below.



| |  |  | Over 25 years of practical experience in petroleum engineering
| | - |  | --------------------------------------------------------------



| |  |  | Registered professional engineer in the state of Texas
| | - |  | ------------------------------------------------------



| |  |  | Bachelor of Science Degree in Petroleum Engineering
| | - |  | ---------------------------------------------------



| |  |  | Master of Business Administration
| | - |  | ---------------------------------

Internal Controls Over Reserves Estimate

MD, the Registrants managing general partner, maintains internal controls such as the
following to ensure the reliability of reserves estimation:



| |  |  | No employees compensation is tied to the amount of reserves booked.
| | - |  | --------------------------------------------------------------------



| |  |  | Comprehensive SEC-compliant internal policies are followed to determine and report proved reserves.
| | - |  | ---------------------------------------------------------------------------------------------------



| |  |  | Reserves estimate is made by experienced reservoir engineers or under their direct supervision.
| | - |  | -----------------------------------------------------------------------------------------------



| |  |  | The reservoir engineers review all the Partnerships reported proved reserves at the close of each quarter.
| | - |  | -----------------------------------------------------------------------------------------------------------



|ITEM 3. | Legal Proceedings
|------- | -----------------

From time to time, the
Registrant may be a party to certain legal actions and claims arising in the ordinary course of business. While the outcome of these events cannot be predicted with certainty, the Partnership does not expect these matters to have a material effect
on its financial position or results of operations.



|ITEM 4. | Reserved for Future Use
|------- | -----------------------



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##### Index to Financial Statements

PART II



|ITEM 5. | Market for Registrants Common Equity and Related Stockholder Matters
|------- | ---------------------------------------------------------------------

At March 31, 2010, the Registrant had 18,000 outstanding limited partnership interests held of record by 710 subscribers. There is no established public or organized trading market for the limited
partner interests.

Revenues which, in the sole judgment of the managing general partner, are not required to meet the Registrants
obligations will be distributed to the partners at least quarterly in accordance with the Registrants Partnership Agreement. Distributions made to partners during the years ended December 31, 2009 and 2008 were $755,873 and $1,657,132,
respectively.



|ITEM 6. | Selected Financial Data
|------- | -----------------------

Not required
under Regulation S-K, Item 301 for smaller reporting companies.



|ITEM 7. | Managements Discussion and Analysis of Financial Condition and Results of Operations
|------- | -------------------------------------------------------------------------------------

General

The Registrant was organized as a Delaware
limited partnership on February 19, 2003. The offering of limited and general partnership interests began May 16, 2003 as a part of an offering registered under the name Mewbourne Energy Partners 02-03 Drilling Programs. The offering of
limited and general partner interests in the Registrant concluded July 9, 2003, with total investor partner contributions of $18,000,000.

The Registrant was formed to engage primarily in the business of drilling development wells, to produce and market crude oil and natural gas produced from such properties, to distribute any net proceeds from operations to the general and
limited partners and to the extent necessary, acquire leases which contain drilling prospects. The economic life of the Registrant depends on the period over which the Registrants oil and gas reserves are economically recoverable.



8



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##### Index to Financial Statements

Results of Operations

Year ended December 31, 2009 compared to the year ended December 31, 2008:



|                  |  |      |         |      |   |          
|----------------- |  | ---- | ------- | ---- | - | ---------
|                  |  | 2009 |         | 2008
|Oil sales         |  | $    | 145,837 |      | $ | 294,911  
|Barrels produced  |  |      | 2,546   |      |   | 2,987    
|Average price/bbl |  | $    | 57.28   |      | $ | 98.73    
|                  |  |     
|Gas sales         |  | $    | 986,890 |      | $ | 2,433,773
|Mcf produced      |  |      | 235,646 |      |   | 315,579  
|Average price/mcf |  | $    | 4.19    |      | $ | 7.71     

Oil and gas revenues. As shown in the
above table, total oil and gas sales decreased by $1,595,957, a 58.5% decline, for the year ended December 31, 2009 as compared to year ended December 31, 2008.

Of this decrease, $123,813 and $1,112,122 were due to decreases in the average prices of oil and gas sold, respectively. Average prices fell to $57.28 from $98.73 per bbl and to $4.19 from $7.71 per mcf
for the year ended December 31, 2009 as compared to the year ended December 31, 2008. In addition, $25,261 and $334,761 were due to decreases in the volumes of oil and gas sold by 441 bbls of oil and 79,933 mcf of gas. The decrease in
volumes sold was primarily due to normal declines in production, in which some wells was substantial.

Lease operations. Lease operating
expense during the year ended December 31, 2009 decreased to $393,493 from $450,812 due to fewer well repairs and workovers.

Production
taxes. Production taxes during the year ended December 31, 2009 decreased to $82,948 from $183,918 for the year ended December 31, 2008 due to decreased revenue.

Administrative and general expenses. Administrative and general expenses decreased to $70,926 in 2009 from $140,056 in 2008 due to decreased administrative expenses allocable to the Partnership.

Depreciation, depletion and amortization. Depreciation, depletion and amortization decreased from $474,285 in 2008 to $288,470 in 2009. The
decrease was primarily due to the lower amortizable base as a result of the $3,146,765 cost ceiling writedown in 2009.

The $3,146,765 cost
ceiling writedown at March 31, 2009 was a result of decreased oil and gas prices on that date. There were no cost ceiling writedowns during 2008.

Liquidity and Capital Resources

Cash decreased by $35,008 during the year ended December 31, 2009. Cash flows from operating
activities were utilized primarily for cash distributions to partners. All wells for which funds have been committed have been drilled. Any incidental future capital expenditures incurred will be paid with current available cash and revenues
generated through oil and gas sales. Revenues which, in the sole judgment of the managing general partner, are not required to meet the Registrants obligations will be distributed to the partners at least quarterly in accordance with the
Registrants Partnership Agreement.



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##### Index to Financial Statements

Critical Accounting Policies

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Significant estimates inherent in the Registrants financial statements include the estimate of oil and gas reserves and future abandonment costs.
Changes in oil and gas prices and the changes in production estimates could have a significant effect on reserve estimates. The reserve estimates directly impact the computation of depreciation, depletion, and amortization, asset retirement
obligation, and the ceiling test for the Registrants oil and gas properties.

The Registrant follows the full-cost method of accounting
for its oil and gas activities. Under the full-cost method, all productive and non-productive costs incurred in the acquisition, exploration and development of oil and gas properties are capitalized. Depreciation, depletion and amortization of oil
and gas properties subject to amortization is computed on the units-of-production method based on the proved reserves underlying the oil and gas properties. Oil and gas properties are subject to a quarterly ceiling test that limits such costs to the
aggregate of the present value of future net cash flows of proved reserves and the lower of cost or fair value of unproved properties. The present value of future net cash flows has been prepared using the oil and gas pricing guidelines established
by the Securities and Exchange Commission, year-end development and production costs and a 10 percent annual discount rate.

In December 2008,
the SEC issued its final rule for Modernization of Oil and Gas Reporting. Pursuant to this rule the SEC adopted revisions to its oil and gas reporting disclosures effective for annual reports on Form 10-K for fiscal years ending on or after
December 31, 2009. The revisions are intended to provide investors with a more meaningful and comprehensive understanding of oil and gas reserves, which should help investors evaluate the relative value of oil and gas entities. In the three
decades that have passed since the original adoption of oil and gas disclosure items, there have been significant changes in the oil and gas industry. These revisions are designed to modernize and update the oil and gas disclosure requirements to
align them with current practices and changes in technology.

The new rules include provisions that permit the use of new technologies to
determine proved reserves. The requirements require entities to report any third party that is relied upon to prepare or audit reserve estimates. In addition, the new rules require that oil and gas reserves be reported and the full cost ceiling
value calculated using average first-of-the-month natural gas and oil prices during the twelve month period ending in the reporting period, compared to prices at period end under prior SEC rules. Under the prior SEC rules, DD&A expense for the
year ended December 31, 2009 would have been $282,068, with a corresponding net loss of $2,858,283 as compared to $288,470 DD&A expense and a net loss of $2,864,685 under the new rules. There would be no cost ceiling write-down differences,
as no write-downs occurred after the rule change effective date. Under the prior SEC rules, reserve valuation at December 31, 2009 would be 58,295 barrels of oil and 3,280,389 mcf of gas, as compared to 54,164 barrels and 2,798,121 mcf under
the new rules.

All financing activities of the Registrant are reported in the financial statements. The Registrant does not engage in any
off-balance sheet financing arrangements. Additionally, the Registrant has no contractual obligations but has a financial obligation to plug and abandon non-producing properties as discussed below.



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##### Index to Financial Statements

New Accounting Pronouncements

Modernization of Natural Gas and Oil Reporting. In January 2009, the SEC issued revisions to the natural gas and oil reporting disclosures, Modernization of Oil and Gas Reporting, Final
Rule (the Final Rule). In January 2010, the FASB updated its oil and gas estimation and disclosure requirements to align its requirements with the SECs modernized oil and gas reporting rules, which are described above. The
update amends the definition of proved reserves to use the average of first-day-of-the-month prices during the twelve months preceding the end of the reporting period, adds definitions used in estimating and disclosing proved oil and natural gas
quantities and expands the disclosures required for equity-method investments. The update must be applied prospectively as a change in accounting principle that is inseparable from a change in accounting estimate and is effective for entities with
annual reporting periods ending on or after December 31, 2009. The Partnership adopted the new standards effective December 31, 2009. See the notes to the financial statements for disclosures regarding natural gas and oil reserves.

FASB Accounting Standards Codification and the Hierarchy of Generally Accepted Accounting Principles. In June 2009, the Financial
Accounting Standards Board (FASB) issued guidance on the accounting standards codification and the hierarchy of generally accepted accounting principles. The accounting standards codification is intended to be the source of authoritative
US GAAP and reporting standards as issued by the FASB. Its primary purpose is to improve clarity and use of existing standards by grouping authoritative literature under common topics. The accounting standards codification is effective for
financial statements issued for interim and annual periods ending after September 15, 2009. The Partnership now describes the authoritative guidance used within the footnotes but no longer uses numerical references. The accounting standards
codification does not change or alter existing US GAAP, and there has been no expected impact on the Partnerships financial position, results of operations or cash flows.

Asset Retirement Obligations

The Partnership has recognized an estimated liability for future
plugging and abandonment costs. A liability for the estimated fair value of the future plugging and abandonment costs is recorded with a corresponding increase in the full cost pool at the time a new well is drilled. Depreciation expense associated
with estimated plugging and abandonment costs is recognized in accordance with the full cost methodology.

The Partnership estimates a
liability for plugging and abandonment costs based on historical experience and estimated well life. The liability is discounted using the credit-adjusted risk-free rate. Revisions to the liability could occur due to changes in well plugging and
abandonment costs or well useful lives, or if federal or state regulators enact new well restoration requirements. The Partnership recognizes accretion expense in connection with the discounted liability over the remaining life of the well.

A reconciliation of the Partnerships liability for well plugging and abandonment costs for the years ended December 31, 2009 and
December 31, 2008 is as follows:



|                             |  |      |         |      |   |         |  
|---------------------------- |  | ---- | ------- | ---- | - | ------- | -
|                             |  | 2009 |         | 2008 |  
|Balance, beginning of period |  | $    | 422,080 |      | $ | 420,949 |  
|Liabilities reduced          |  |      |        |      |   | (9,986  | )
|Accretion expense            |  |      | 14,884  |      |   | 11,117  |  
|                             |  |      |         |      |   |         |  
|                             |  |     
|Balance, end of period       |  | $    | 436,964 |      | $ | 422,080 |  
|                             |  |      |         |      |   |         |  



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##### Index to Financial Statements

Organization and Related Party Transactions

The Partnership was organized on February 19, 2003 in accordance with the laws of the state of Delaware. MD, a Delaware Corporation, has been appointed as the Registrants managing general
partner. MD has no significant equity interest in the Registrant. Mewbourne Oil Company (MOC) is operator of oil and gas properties owned by the Partnership. Mewbourne Holdings, Inc. is the parent of both MD and MOC. Substantially all transactions
are with MD and MOC.

In the ordinary course of business, MOC will incur certain costs that will be passed on to well owners of the well for
which the costs were incurred. The Partnership will receive their portion of these costs based upon their ownership in each well incurring the costs. These costs are referred to as operator charges and are standard and customary in the oil and gas
industry. Operator charges include recovery of gas marketing costs, fixed rate overhead, supervision, pumping, and equipment furnished by the operator, some of which will be included in the full cost pool pursuant to Rule 4-10(c)(2) of Regulation
S-X. Reimbursement to MOC for operator charges totaled $240,863 and $237,402 for the years ended December 31, 2009 and 2008, respectively. Operator charges are billed in accordance with the Program and Partnership Agreements.

In general, during any particular calendar year, the total amount of administrative expenses allocated to the Partnership by MOC shall not exceed the
greater of (a) 3.5% of the Partnerships gross revenue from the sale of oil and natural gas production during each year (calculated without any deduction for operating costs or other costs and expenses) or (b) the sum of $50,000 plus
..25% of the capital contributions of limited and general partners. Administrative expenses can only be paid out of funds available for distributions. Under this arrangement, $47,773 and $100,316 were allocated to the Partnership during the years
ended December 31, 2009 and 2008, respectively.

The Partnership participates in oil and gas activities through a Drilling Program
Agreement (the Program). The Partnership and MD are parties to the Program Agreement. The costs and revenues of the Program are allocated to MD and the Partnership as follows:



|                                                                                                       |  |             |   |  |     |  
|------------------------------------------------------------------------------------------------------ |  | ----------- | - |  | --- | -
|                                                                                                       |  | Partnership |   |  | MD  |  
|Revenues:                                                                                              |  |             |   |  |     |  
|Proceeds from disposition of depreciable and depletable properties                                     |  | 60          | % |  | 40  | %
|All other revenues                                                                                     |  | 60          | % |  | 40  | %
|Costs and expenses:                                                                                    |  |             |   |  |     |  
|Organization and offering costs (1)                                                                    |  | 0           | % |  | 100 | %
|Lease acquisition costs (1)                                                                            |  | 0           | % |  | 100 | %
|Tangible and intangible drilling costs (1)                                                             |  | 100         | % |  | 0   | %
|Operating costs, reporting and legal expenses, general and administrative expenses and all other costs |  | 60          | % |  | 40  | %



|(1) | As noted above, pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which should approximate 30% of total
capital costs. To the extent that organization and offering costs and lease acquisition costs are less than 30% of total capital costs, MD is responsible for tangible drilling costs until its share of the Programs total capital costs reaches
approximately 30%. The Partnerships financial statements reflect its respective proportionate interest in the Program.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|ITEM 7A. | Quantitative and Qualitative Disclosures about Market Risk
|-------- | ----------------------------------------------------------

Not required under Regulation S-K, Item 305 for smaller reporting companies.



|ITEM 8. | Financial Statements and Supplementary Data
|------- | -------------------------------------------

The required financial statements of the Registrant are contained in a separate section of this report following the signature attestation. See Item 15. Exhibits, Financial Statements, Financial Statement Schedules and Reports on Form
8-K.



|ITEM 9. | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
|------- | ------------------------------------------------------------------------------------

None.



|ITEM 9A. | Controls and Procedures
|-------- | -----------------------

(a) Evaluation
of Disclosure Controls and Procedures

As of the end of the period covered by this report, MDs management conducted an evaluation, under
the supervision and with the participation of MDs principal executive officer and principal financial officer, of the Registrants disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act).
Based on this evaluation, MDs principal executive officer and principal financial officer concluded that, as of the end of the period covered by this report, the Registrants disclosure controls and procedures are effective.
Notwithstanding the foregoing, a control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that it will detect or uncover failures within the Registrant to disclose material information otherwise
required to be set forth in the Registrants periodic reports.

(b) MD Managements Annual Report on Internal Control Over Financial
Reporting

MDs management is responsible for establishing and maintaining adequate internal control over financial reporting, as such
term is defined in Exchange Act Rules 13a-15(f). Under the supervision and with the participation of MDs management, including MDs principal executive officer and principal financial officer, MD conducted an evaluation of the
effectiveness of the Partnerships internal control over financial reporting based on the framework in Internal Control  Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on
MDs evaluation under the framework in Internal Control  Integrated Framework, MDs management concluded that internal control over financial reporting was effective as of December 31, 2009. This annual report does not include
an attestation report of the Registrants registered public accounting firm regarding internal control over financial reporting. Managements report was not subject to attestation by the Registrants registered public accounting firm
pursuant to temporary rules of the Securities and Exchange Commission that permit the Registrant to provide only managements report in this annual report. There have been no changes in MDs internal controls for the quarter ended
December 31, 2009 or in other factors which have materially affected, or are reasonably likely to materially affect the internal controls over financial reporting.



13



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##### Index to Financial Statements

PART III



|ITEM 10. | Directors and Executive Officers of the Registrant
|-------- | --------------------------------------------------

The Registrant does not have any officers or directors. Under the Registrants Partnership Agreement, the Registrants managing partner, MD, is granted the exclusive right and full authority to
manage, control and administer the Registrants business. MD is a wholly owned subsidiary of Mewbourne Holdings, Inc.

Set forth below
are the names, ages and positions of the directors and executive officers of MD, the Registrants managing general partner. Directors of MD are elected to serve until the next annual meeting of stockholders or until their successors are elected
and qualified.



|                    |  |                           |  |                                                     
|------------------- |  | ------------------------- |  | ----------------------------------------------------
|Name                |  | Age as ofDecember 31,2009 |  | Position                                            
|Curtis W. Mewbourne |  | 74                        |  | President and Director                              
|                    |  |                          
|J. Roe Buckley      |  | 47                        |  | Executive Vice President and Chief Financial Officer
|                    |  |                          
|Alan Clark          |  | 57                        |  | Treasurer and Controller                            
|                    |  |                          
|Michael F. Shepard  |  | 63                        |  | Secretary and General Counsel                       
|                    |  |                          
|Dorothy M. Cuenod   |  | 49                        |  | Assistant Secretary and Director                    
|                    |  |                          
|Ruth M. Buckley     |  | 48                        |  | Assistant Secretary and Director                    
|                    |  |                          
|Julie M. Greene     |  | 46                        |  | Assistant Secretary and Director                    

Curtis W. Mewbourne, age 74, formed Mewbourne Holdings, Inc. in 1965 and serves as Chairman of the Board and President of Mewbourne Holdings, Inc., MD and MOC. He has operated as an independent oil and gas producer for the past 44
years. Mr. Mewbourne received a Bachelor of Science Degree in Petroleum Engineering from the University of Oklahoma in 1957. Mr. Mewbourne is the father of Dorothy M. Cuenod, Ruth M. Buckley, and Julie M. Greene and the father-in-law of J.
Roe Buckley.

J. Roe Buckley, age 47, joined Mewbourne Holdings, Inc. in July, 1990 and serves as Executive Vice
President and Chief Financial Officer of both MD and MOC. Mr. Buckley was employed by Mbank Dallas from 1985 to 1990 where he served as a commercial loan officer. He received a Bachelor of Arts in Economics from Sewanee in 1984.
Mr. Buckley is the son-in-law of Curtis W. Mewbourne and is married to Ruth M. Buckley. He is also the brother-in-law of Dorothy M. Cuenod and Julie M. Greene.



14



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##### Index to Financial Statements

Alan Clark, age 57, joined MOC in 1979 and serves as Treasurer and Controller of both
MD and MOC. Prior to joining MOC, Mr. Clark was employed by Texas Oil and Gas Corporation as Assistant Supervisor of joint interest accounting from 1976 to 1979. Mr. Clark has served in several accounting/finance positions with MOC prior
to his current assignment. Mr. Clark received a Bachelor of Business Administration from the University of Texas at Arlington.

Michael F. Shepard, age 63, joined MOC in 1986 and serves as Secretary and General Counsel of MD. He has practiced law exclusively in the oil and gas industry since 1979 and formerly was counsel with Parker Drilling Company and its
Perry Gas subsidiary for seven years. Mr. Shepard holds the Juris Doctor degree from the University of Tulsa where he received the National Energy Law and Policy Institute award as the outstanding graduate in the Energy Law curriculum. He
received a B.A. degree, magna cum laude, from the University of Massachusetts in 1976. Mr. Shepard is a member of the bar in Texas and Oklahoma.

Dorothy M. Cuenod, age 49 received a B.A. degree in Art History from The University of Texas and a Masters of Business Administration Degree from Southern Methodist University. Since 1984 she has
served as a Director and Assistant Secretary of both MD and MOC. Ms. Cuenod is the daughter of Curtis W. Mewbourne and is the sister of Ruth M. Buckley and Julie M. Greene. She is also the sister-in-law of J. Roe Buckley.

Ruth M. Buckley, age 48, received a Bachelor of Science Degree in both Engineering and Geology from Vanderbilt University. Since 1987
she has served as a Director and Assistant Secretary of both MD and MOC. Ms. Buckley is the daughter of Curtis W. Mewbourne and is the sister of Dorothy M. Cuenod and Julie M. Greene. She is also the wife of J. Roe Buckley.

Julie M. Greene, age 46, received a B.A. degree in Business Administration from The University of Oklahoma. Since 1988 she has served
as a Director and Assistant Secretary of both MD and MOC. Prior to that time she was employed by Rauscher, Pierce, Refsnes, Inc. Ms. Greene is the daughter of Curtis W. Mewbourne and is the sister of Dorothy M. Cuenod and Ruth M. Buckley. She
is also the sister-in-law of J. Roe Buckley.

The organizational structure of the Partnership does not provide for an audit committee and
therefore the Partnership does not have an audit committee or financial expert serving in such capacity.



|ITEM 11. | Executive Compensation
|-------- | ----------------------

The Registrant
does not have any officers or directors. Management of the Registrant is vested in the managing general partner. None of the officers or directors of MD or MOC will receive remuneration directly from the Registrant, but will continue to be
compensated by their present employers. The Registrant will reimburse MD and MOC and affiliates thereof for certain costs of overhead falling within the definition of Administrative Costs, including without limitation, salaries of the officers and
employees of MD and MOC; provided that no portion of the salaries of the directors or of the executive officer of MOC or MD may be reimbursed as Administrative Costs.



|ITEM 12. | Security Ownership of Certain Beneficial Owners and Management
|-------- | --------------------------------------------------------------

(a) Beneficial owners of more than five percent



|               |  |                        |  |                                     |  |               
|-------------- |  | ---------------------- |  | ----------------------------------- |  | --------------
|Title of Class |  | Name ofBeneficialOwner |  | Amount andNature ofBeneficial Owner |  | PercentofClass
|None           |  | None                   |  | N/A                                 |  | N/A           



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##### Index to Financial Statements

(b) Security ownership of management

The Registrant does not have any officers or directors. The managing general partner of the Registrant, MD, has the exclusive right and full authority to manage, control and administer the
Registrants business. Under the Registrants Partnership Agreement, limited and general partners holding a majority of the outstanding limited and general partnership interests have the right to take certain actions, including the removal
of the managing general partner. The Registrant is not aware of any current arrangement or activity that may lead to such removal.



|ITEM 13. | Certain Relationships and Related Transactions
|-------- | ----------------------------------------------

Transactions with MD and its affiliates

Pursuant to the Registrants Partnership Agreement, the Registrant had the following
related party transactions with MD and its affiliates during the years ended December 31, 2009 and 2008:



|                                                                                                                                                                                  |  |      |         |      |   |        
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ---- | ------- | ---- | - | -------
|                                                                                                                                                                                  |  | 2009 |         | 2008
|Administrative and general expense, management fees (if applicable) and payment of well charges and supervision charges in
accordance with standard industry operating agreements |  | $    | 288,636 |      | $ | 337,718
|                                                                                                                                                                                  |  |      |         |      |   |        

The Registrant participates in oil and gas activities through a
drilling program created by the Program. Pursuant to the Program, MD pays approximately 30% of the Programs capital expenditures and approximately 40% of its operating and general and administrative expenses. The Registrant pays the remainder
of the costs and expenses of the Program. In return, MD is allocated approximately 40% of the Programs revenues.



|ITEM 14. | Principal Accountant Fees and Services
|-------- | --------------------------------------

The Partnership has retained BDO Seidman, LLP as their independent registered public accounting firm to perform auditing services. BDO Seidman, LLPs fees for 2009 and 2008 are set forth below:



|           |  |                                  |        |      |   |       
|---------- |  | -------------------------------- | ------ | ---- | - | ------
|           |  | For the Years Ended December 31,
|           |  | 2009                             |        | 2008
|Audit Fees |  | $                                | 24,859 |      | $ | 24,000
|           |  |                                  |        |      |   |       



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##### Index to Financial Statements

PART IV



|ITEM 15. | Exhibits, Financial Statements, Financial Statement Schedules and Reports on Form 8-K
|-------- | -------------------------------------------------------------------------------------



|    |  |                     |  |                                                                                                                     |  |                                                                                           |  |   
|--- |  | ------------------- |  | ------------------------------------------------------------------------------------------------------------------- |  | ----------------------------------------------------------------------------------------- |  | --
|(a) |  | 1.                  |  | Financial statements                                                                                                |  |                                                                                          
|    |  |                     | 
|    |  |                     |  | The following are filed as part of this annual report:                                                              |  |                                                                                          
|    |  |                     |  |                                                                                                                    
|    |  |                     |  |                                                                                                                     |  | Report of Independent Registered Accounting Firm                                          |  | 20
|    |  |                     |  |                                                                                                                    
|    |  |                     |  |                                                                                                                     |  | Balance sheets as of December 31, 2009 and 2008                                           |  | 21
|    |  |                     |  |                                                                                                                    
|    |  |                     |  |                                                                                                                     |  | Statements of operations for the years ended December 31, 2009 and 2008                   |  | 22
|    |  |                     |  |                                                                                                                    
|    |  |                     |  |                                                                                                                     |  | Statements of changes in partners capital for the years ended December 31, 2009 and 2008 |  | 23
|    |  |                     |  |                                                                                                                    
|    |  |                     |  |                                                                                                                     |  | Statements of cash flows for the years ended December 31, 2009 and 2008                   |  | 24
|    |  |                     |  |                                                                                                                    
|    |  |                     |  |                                                                                                                     |  | Notes to financial statements                                                             |  | 25
|    |  |                     | 
|    |  | 2.                  |  | Financial statement schedules                                                                                       |  |                                                                                          
|    |  |                     | 
|    |  |                     |  | Not required for smaller reporting companies                                                                        |  |                                                                                          
|    |  |                     | 
|    |  | 3.                  |  | Exhibits                                                                                                            |  |                                                                                          
|    |  |                     | 
|    |  |                     |  | The exhibits listed on the accompanying index are filed or incorporated by reference as part of this annual report. |  |                                                                                          
|    |  |                    
|(b) |  | Reports on Form 8-K |  |                                                                                                                    
|    |  |                     | 
|    |  |                     |  | None.                                                                                                               |  |                                                                                          



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereto duly authorized.



Mewbourne Energy Partners 03-A, L.P.By:

Mewbourne Development CorporationManaging General PartnerBy:

/s/ Curtis W. MewbourneCurtis W. MewbournePresident and Director(Principal Executive Officer)


Pursuant to the
requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the date indicated.



|                                            |  |                                                  |  |               
|------------------------------------------- |  | ------------------------------------------------ |  | --------------
|/s/ Curtis W. Mewbourne Curtis W. Mewbourne |  | President/Director                               |  | March 31, 2010
|                                            |  |                                                 
|/s/ J. Roe Buckley J. Roe Buckley           |  | Executive Vice President Chief Financial Officer |  | March 31, 2010
|                                            |  |                                                 
|/s/ Alan Clark Alan Clark                   |  | Treasurer and Controller                         |  | March 31, 2010
|                                            |  |                                                 
|/s/ Dorothy M. Cuenod Dorothy M. Cuenod     |  | Director                                         |  | March 31, 2010
|                                            |  |                                                 
|/s/ Ruth M. Buckley Ruth M. Buckley         |  | Director                                         |  | March 31, 2010
|                                            |  |                                                 
|/s/ Julie M. Greene Julie M. Greene         |  | Director                                         |  | March 31, 2010

Supplemental Information to be Furnished
With Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act

No annual report or proxy material has been sent to the Registrants security holders.



18



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##### Index to Financial Statements

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

FINANCIAL STATEMENTS

WITH REPORT OF INDEPENDENT REGISTERED ACCOUNTING FIRM

For the years ended December 31, 2009 and 2008



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##### Index to Financial Statements

Report of Independent Registered Public Accounting Firm

To the Partners of Mewbourne Energy Partners 03-A L.P. and to the Board of Directors of Mewbourne Development Corporation, Tyler, Texas

We have audited the accompanying balance sheets of Mewbourne Energy Partners 03-A L.P. as of December 31, 2009 and 2008 and the related consolidated
statements of operations, changes in partners capital and cash flows for each of the two years in the period ended December 31, 2009. These financial statements are the responsibility of the Companys management. Our responsibility
is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the
Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Company is not
required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are
appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Companys internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We
believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Mewbourne Energy Partners 03-A L.P. at December 31, 2009 and 2008, and the results of its operations and its cash flows for each of the two years in the period ended December 31,
2009, in conformity with accounting principles generally accepted in the United States of America.

As discussed in Note 1 to the
financial statements, during 2009 the Partnership changed its reserve estimates and related disclosures as a result of adopting new oil and natural gas reserve estimation and disclosure requirements.

/s/ BDO Seidman, LLP

Dallas, Texas

March 31, 2010



20



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##### Index to Financial Statements

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

BALANCE SHEETS

December 31, 2009 and 2008



|                                                                      |  |      |             |   |      |   |             |  
|--------------------------------------------------------------------- |  | ---- | ----------- | - | ---- | - | ----------- | -
|                                                                      |  | 2009 |             |   | 2008 |  
|ASSETS                                                                |  |      |             |   |      |   |             |  
|                                                                      |  |     
|Cash                                                                  |  | $    | 1,348       |   |      | $ | 36,356      |  
|Accounts receivable, affiliate                                        |  |      | 180,379     |   |      |   | 340,021     |  
|Prepaid state taxes                                                   |  |      | 6,121       |   |      |   | 6,179       |  
|                                                                      |  |      |             |   |      |   |             |  
|Total current assets                                                  |  |      | 187,848     |   |      |   | 382,556     |  
|                                                                      |  |      |             |   |      |   |             |  
|                                                                      |  |     
|Oil and gas properties at cost, full-cost method                      |  |      | 19,576,157  |   |      |   | 19,578,827  |  
|Less accumulated depreciation, depletion, amortization and impairment |  |      | (17,034,414 | ) |      |   | (13,599,179 | )
|                                                                      |  |      |             |   |      |   |             |  
|                                                                      |  |      | 2,541,743   |   |      |   | 5,979,648   |  
|                                                                      |  |      |             |   |      |   |             |  
|Total assets                                                          |  | $    | 2,729,591   |   |      | $ | 6,362,204   |  
|                                                                      |  |      |             |   |      |   |             |  
|                                                                      |  |     
|LIABILITIES AND PARTNERS CAPITAL                                     |  |      |             |   |      |   |             |  
|                                                                      |  |     
|Accounts payable, affiliate                                           |  | $    | 48,044      |   |      | $ | 74,983      |  
|                                                                      |  |      |             |   |      |   |             |  
|Total current liabilities                                             |  |      | 48,044      |   |      |   | 74,983      |  
|                                                                      |  |      |             |   |      |   |             |  
|                                                                      |  |     
|Asset retirement obligation                                           |  |      | 436,964     |   |      |   | 422,080     |  
|                                                                      |  |     
|Partners capital                                                     |  |      | 2,244,583   |   |      |   | 5,865,141   |  
|                                                                      |  |      |             |   |      |   |             |  
|                                                                      |  |     
|Total liabilities and partners capital                               |  | $    | 2,729,591   |   |      | $ | 6,362,204   |  
|                                                                      |  |      |             |   |      |   |             |  

The accompanying notes are an integral part of the financial statements.



21



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MEWBOURNE ENERGY PARTNERS 03-A, L.P.

STATEMENTS OF OPERATIONS

For the years ended December 31, 2009 and 2008



|                                                                                        |  |      |            |   |      |   |          
|--------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------
|                                                                                        |  | 2009 |            |   | 2008
|Revenues and other income:                                                              |  |      |            |   |      |   |          
|Oil sales                                                                               |  | $    | 145,837    |   |      | $ | 294,911  
|Gas sales                                                                               |  |      | 986,890    |   |      |   | 2,433,773
|Interest income                                                                         |  |      | 74         |   |      |   | 389      
|                                                                                        |  |      |            |   |      |   |          
|Total revenues and other income                                                         |  |      | 1,132,801  |   |      |   | 2,729,073
|                                                                                        |  |      |            |   |      |   |          
|                                                                                        |  |     
|Expenses:                                                                               |  |      |            |   |      |   |          
|Lease operating expense                                                                 |  |      | 393,493    |   |      |   | 450,812  
|Production taxes                                                                        |  |      | 82,948     |   |      |   | 183,918  
|Administrative and general expense                                                      |  |      | 70,926     |   |      |   | 140,056  
|Depreciation, depletion, and amortization                                               |  |      | 288,470    |   |      |   | 474,285  
|Cost ceiling write-down                                                                 |  |      | 3,146,765  |   |      |   |         
|Asset retirement obligation accretion                                                   |  |      | 14,884     |   |      |   | 11,117   
|                                                                                        |  |      |            |   |      |   |          
|Total expenses                                                                          |  |      | 3,997,486  |   |      |   | 1,260,188
|                                                                                        |  |      |            |   |      |   |          
|                                                                                        |  |     
|Net income (loss)                                                                       |  | $    | (2,864,685 | ) |      | $ | 1,468,885
|                                                                                        |  |      |            |   |      |   |          
|                                                                                        |  |     
|Basic and diluted net income (loss) per partner interest (18,000 interests outstanding) |  | $    | (159.15    | ) |      | $ | 81.60    
|                                                                                        |  |      |            |   |      |   |          

The accompanying notes are an integral part of the
financial statements.



22



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MEWBOURNE ENERGY PARTNERS 03-A, L.P.

STATEMENTS OF CHANGES IN PARTNERS CAPITAL

For the years ended December 31, 2009 and 2008



|                                                                              |  |                  |            |  
|----------------------------------------------------------------------------- |  | ---------------- | ---------- | -
|                                                                              |  | PartnersCapital |           
|Balance at December 31, 2007                                                  |  | $                | 6,053,388  |  
|                                                                              | 
|Cash distributions                                                            |  |                  | (1,657,132 | )
|Net income                                                                    |  |                  | 1,468,885  |  
|                                                                              |  |                  |            |  
|                                                                              | 
|Balance at December 31, 2008                                                  |  |                  | 5,865,141  |  
|                                                                              | 
|Cash distributions                                                            |  |                  | (755,873   | )
|Net loss                                                                      |  |                  | (2,864,685 | )
|                                                                              |  |                  |            |  
|                                                                              | 
|Balance at December 31, 2009                                                  |  | $                | 2,244,583  |  
|                                                                              |  |                  |            |  
|                                                                              | 
|Distribution amount per partnership unit for the year ended December 31, 2008 |  | $                | 92.06      |  
|                                                                              |  |                  |            |  
|                                                                              | 
|Distribution amount per partnership unit for the year ended December 31, 2009 |  | $                | 41.99      |  
|                                                                              |  |                  |            |  

The accompanying notes are an integral part of the financial statements.



23



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##### Index to Financial Statements

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

STATEMENTS OF CASH FLOWS

For the years ended December 31, 2009 and 2008



|                                                                                            |  |      |            |   |      |   |            |  
|------------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                                                                            |  | 2009 |            |   | 2008 |  
|Cash flows from operating activities:                                                       |  |      |            |   |      |   |            |  
|Net income (loss)                                                                           |  | $    | (2,864,685 | ) |      | $ | 1,468,885  |  
|Adjustments to reconcile net income (loss) to net cash provided by operating activities:    |  |      |            |   |      |   |            |  
|Depreciation, depletion, and amortization                                                   |  |      | 288,470    |   |      |   | 474,285    |  
|Cost ceiling write-down                                                                     |  |      | 3,146,765  |   |      |   |           |  
|Asset retirement obligation accretion                                                       |  |      | 14,884     |   |      |   | 11,117     |  
|Changes in operating assets and liabilities:                                                |  |      |            |   |      |   |            |  
|Accounts receivable, affiliate                                                              |  |      | 159,642    |   |      |   | 84,741     |  
|Prepaid state taxes                                                                         |  |      | 58         |   |      |   | (6,179     | )
|Accounts payable, affiliate                                                                 |  |      | (26,939    | ) |      |   | (346,029   | )
|                                                                                            |  |      |            |   |      |   |            |  
|Net cash provided by operating activities                                                   |  |      | 718,195    |   |      |   | 1,686,820  |  
|                                                                                            |  |      |            |   |      |   |            |  
|                                                                                            |  |     
|Cash flows from investing activities:                                                       |  |      |            |   |      |   |            |  
|Proceeds from sale of oil and gas properties                                                |  |      | 2,670      |   |      |   |           |  
|Purchase and development of oil and gas properties                                          |  |      |           |   |      |   | (4,221     | )
|                                                                                            |  |      |            |   |      |   |            |  
|Net cash provided by (used in) investing activities                                         |  |      | 2,670      |   |      |   | (4,221     | )
|                                                                                            |  |      |            |   |      |   |            |  
|                                                                                            |  |     
|Cash flows from financing activities:                                                       |  |      |            |   |      |   |            |  
|Cash distributions to partners                                                              |  |      | (755,873   | ) |      |   | (1,657,132 | )
|                                                                                            |  |      |            |   |      |   |            |  
|Net cash used in financing activities                                                       |  |      | (755,873   | ) |      |   | (1,657,132 | )
|                                                                                            |  |      |            |   |      |   |            |  
|                                                                                            |  |     
|Net increase (decrease) in cash                                                             |  |      | (35,008    | ) |      |   | 25,467     |  
|Cash, beginning of period                                                                   |  |      | 36,356     |   |      |   | 10,889     |  
|                                                                                            |  |      |            |   |      |   |            |  
|                                                                                            |  |     
|Cash, end of period                                                                         |  | $    | 1,348      |   |      | $ | 36,356     |  
|                                                                                            |  |      |            |   |      |   |            |  
|                                                                                            |  |     
|Supplemental Cash Flow Information:                                                         |  |      |            |   |      |   |            |  
|Non-cash changes to oil & gas properties related to asset retirement obligation liabilities |  | $    |           |   |      | $ | (9,986     | )
|                                                                                            |  |      |            |   |      |   |            |  

The accompanying notes are an integral part of the financial statements.



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##### Index to Financial Statements

Mewbourne Energy Partners 03-A, L.P.

NOTES TO FINANCIAL STATEMENTS

1.
Significant Accounting Policies:

Accounting for Oil and Gas Producing Activities

Mewbourne Energy Partners 03-A, L.P., (the Registrant or the Partnership), a Delaware limited partnership engaged primarily in oil and gas development and production in Texas,
Oklahoma, and New Mexico, was organized on February 19, 2003. The offering of limited and general partnership interests began May 16, 2003 as a part of an offering registered under the name Mewbourne Energy Partners 02-03 Drilling
Programs, (the Program), and concluded July 9, 2003, with total investor contributions of $18,000,000 originally being sold to 710 subscribers of which $16,107,005 were sold to 644 subscribers as general partner equity interests and
$1,892,995 were sold to 66 subscribers as limited partner equity interests. During 2005 all general partner equity interests were converted to limited partner interests. The managing general partner has no significant equity interest in the
Partnership.

The Programs sole business is the development and production of oil and gas with a concentration on gas. A substantial
portion of the Programs gas production is being sold regionally in the spot market. Due to the highly competitive nature of the spot market, prices are subject to seasonal and regional pricing fluctuations. In addition, such spot market sales
are generally short-term in nature and are dependent upon obtaining transportation services provided by pipelines. The prices received for the Programs oil and gas are subject to influences such as global consumption and supply trends.

The Partnership follows the full-cost method of accounting for its oil and gas activities. Under the full-cost method, all productive and
non-productive costs incurred in the acquisition, exploration and development of oil and gas properties are capitalized. Depreciation, depletion and amortization of oil and gas properties subject to amortization is computed on the
units-of-production method based on the proved reserves underlying the oil and gas properties. At December 31, 2009 and 2008, all capitalized costs were subject to amortization. Proceeds from the sale or other disposition of properties are
credited to the full cost pool. Gains and losses are not recognized unless such adjustments would significantly alter the relationship between capitalized costs and the proved oil and gas reserves. Capitalized costs are subject to a quarterly
ceiling test that limits such costs to the aggregate of the present value of future net cash flows of proved reserves and the lower of cost or fair value of unproved properties. There was a cost ceiling writedown of $3,146,765 on March 31, 2009
due to lower oil and gas prices on that date.

Significant estimates inherent in the Registrants financial statements include the
estimate of oil and gas reserves and future abandonment costs. Changes in oil and gas prices and the changes in production estimates could have a significant effect on reserve estimates. The reserve estimates directly impact the computation of
depreciation, depletion, and amortization, asset retirement obligation, and the ceiling test for the Registrants oil and gas properties.

In December 2008, the SEC issued its final rule for Modernization of Oil and Gas Reporting. Pursuant to this rule the SEC adopted revisions to its oil and gas reporting disclosures effective for annual reports on Form 10-K for fiscal years
ending on or after December 31, 2009. The revisions are intended to provide investors with a more meaningful and comprehensive understanding of oil and gas reserves, which should help investors evaluate the relative value of oil and gas
entities. In the three decades that have passed since the original adoption of oil and gas disclosure items, there have been significant changes in the oil and gas industry. These revisions are designed to modernize and update the oil and gas
disclosure requirements to align them with current practices and changes in technology.



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##### Index to Financial Statements

The new rules include provisions that permit the use of new technologies to determine proved reserves. The
requirements require entities to report any third party that is relied upon to prepare or audit reserve estimates. In addition, the new rules require that oil and gas reserves be reported and the full cost ceiling value calculated using average
first-of-the-month natural gas and oil prices during the twelve month period ending in the reporting period, compared to prices at period end under prior SEC rules. These revisions and requirements affect the comparability between reporting periods
for reserve volume and value estimates, full cost pool write-down calculations and the calculation of depreciation, depletion and amortization of oil and gas assets.

Under the prior SEC rules, DD&A expense for the year ended December 31, 2009 would have been $282,068, with a corresponding net loss of $2,858,283 as compared to $288,470 DD&A expense and a
net loss of $2,864,685 under the new rules. There would be no cost ceiling write-down differences, as no write-downs occurred after the rule change effective date. Adopting the new rules also had an effect on the net proved oil and gas reserves
presented in Note 3.

The preparation of financial statements in conformity with generally accepted accounting principles requires management
to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.

New Accounting Pronouncements

Modernization of Natural Gas and Oil Reporting. In January 2009, the SEC issued revisions to the natural gas and oil reporting disclosures,
Modernization of Oil and Gas Reporting, Final Rule (the Final Rule). In January 2010, the FASB updated its oil and gas estimation and disclosure requirements to align its requirements with the SECs modernized oil and
gas reporting rules, which are described above. The update amends the definition of proved reserves to use the average of first-day-of-the-month prices during the twelve months preceding the end of the reporting period, adds definitions used in
estimating and disclosing proved oil and natural gas quantities and expands the disclosures required for equity-method investments. The update must be applied prospectively as a change in accounting principle that is inseparable from a change in
accounting estimate and is effective for entities with annual reporting periods ending on or after December 31, 2009. The Partnership adopted the new standards effective December 31, 2009.

FASB Accounting Standards Codification and the Hierarchy of Generally Accepted Accounting Principles. In June 2009, the Financial Accounting
Standards Board (FASB) issued guidance on the accounting standards codification and the hierarchy of generally accepted accounting principles. The accounting standards codification is intended to be the source of authoritative
US GAAP and reporting standards as issued by the FASB. Its primary purpose is to improve clarity and use of existing standards by grouping authoritative literature under common topics. The accounting standards codification is effective for
financial statements issued for interim and annual periods ending after September 15, 2009. The Partnership now describes the authoritative guidance used within the footnotes but no longer uses numerical references. The accounting standards
codification does not change or alter existing US GAAP, and there has been no expected impact on the Partnerships financial position, results of operations or cash flows.

Cash

The Partnership maintains all its cash in one financial institution. At various times
throughout the year, the cash amount may be in excess of the amount insured by the Federal Deposit Insurance Corporation.

Fair Value of
Financial Instruments

The Financial Accounting Standards Board (FASB) has issued guidance on determining the estimated fair value
for financial instruments. This disclosure states that the fair value of financial instruments is determined at discrete points in time based on relevant market information. Such estimates involve uncertainties and cannot be determined with
precision. The estimated fair value of cash, accounts receivable and accounts payable approximates their carrying value due to their short-term nature.



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##### Index to Financial Statements

Asset Retirement Obligations

The Partnership has recognized an estimated liability for future plugging and abandonment costs. The estimated liability is based on historical experience and estimated well life. The liability is
discounted using the credit-adjusted risk-free rate. Revisions to the liability could occur due to changes in well plugging and abandonment costs or well useful lives, or if federal or state regulators enact new well restoration requirements. The
Partnership recognizes accretion expense in connection with the discounted liability over the remaining life of the well.

A reconciliation of
the Partnerships liability for well plugging and abandonment costs for the years ended December 31, 2009 and December 31, 2008 is as follows:



|                             |  |      |         |      |   |         |  
|---------------------------- |  | ---- | ------- | ---- | - | ------- | -
|                             |  | 2009 |         | 2008 |  
|Balance, beginning of period |  | $    | 422,080 |      | $ | 420,949 |  
|Liabilities reduced          |  |      |        |      |   | (9,986  | )
|Accretion expense            |  |      | 14,884  |      |   | 11,117  |  
|                             |  |      |         |      |   |         |  
|                             |  |     
|Balance, end of period       |  | $    | 436,964 |      | $ | 422,080 |  
|                             |  |      |         |      |   |         |  

Oil and Gas Sales

The Programs oil and condensate production is sold and revenue recognized at or near the Programs wells under short-term purchase contracts at prevailing prices in accordance with arrangements which are customary in the oil
industry. Sales of gas applicable to the Programs interest are recorded as revenue when the gas is metered and title transferred pursuant to the gas sales contracts covering the Programs interest in gas reserves. The Partnership uses the
sales method to recognize oil and gas revenue whereby revenue is recognized for the amount of production taken regardless of the amount for which the Partnership is entitled based on its working interest ownership. As of December 31, 2009 and
2008, no material gas imbalances between the Partnership and other working interest owners existed.

Substantially all of the
Partnerships accounts receivable result from oil and natural gas sales to third parties in the oil and natural gas industry. This concentration of customers may impact the Partnerships overall credit risk in that these entities may be
similarly affected by changes in economic and other conditions. Historically, the Partnership has not experienced significant credit losses on such receivables. No bad debt expense was recorded in 2009 or 2008. The Partnership cannot ensure that
such losses will not be realized in the future.

Income Taxes

The Partnership is treated as a partnership for income tax purposes and, as a result, income of the Partnership is reported on the tax returns of the partners and no recognition is given to income taxes
in the financial statements. The Partnerships financial reporting bases of its net assets exceeded the tax bases of its net assets by $2,312,476 and $5,561,252 at December 31, 2009 and 2008, respectively.

2. Organization and Related Party Transactions:

The Partnership was organized on February 19, 2003 in accordance with the laws of the state of Delaware. MD, a Delaware Corporation, has been appointed as the Registrants managing general partner. MD has no significant equity
interest in the Registrant. Mewbourne Oil Company (MOC) is operator of oil and gas properties owned by the Partnership. Mewbourne Holdings, Inc. is the parent of both MD and MOC. Substantially all transactions are with MD and MOC.



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##### Index to Financial Statements

In the ordinary course of business, MOC will incur certain costs that will be passed on to well owners of
the well on which the costs were incurred. The Partnership will be charged their portion of these costs based upon their ownership in each well incurring the costs. These costs are referred to as Operator charges and are standard and customary in
the oil and gas industry. Operator charges include recovery of gas marketing costs, fixed rate overhead, supervision, pumping, and equipment furnished by the operator, some of which will be included in the full cost pool pursuant to Rule 4-10(c)(2)
of Regulation S-X. Reimbursement to MOC for operator charges totaled $240,863 and $237,402 for the years ended December 31, 2009 and 2008, respectively. Operator charges are billed in accordance with the Program and Partnership Agreements.

In general, during any particular calendar year, the total amount of administrative expenses allocated to the Partnership by MOC shall not
exceed the greater of (a) 3.5% of the Partnerships gross revenue from the sale of oil and natural gas production during each year (calculated without any deduction for operating costs or other costs and expenses) or (b) the sum of
$50,000 plus .25% of the capital contributions of limited and general partners. Administrative expenses can only be paid out of funds available for distributions. Under this arrangement, $47,773 and $100,316 were allocated to the Partnership during
the years ended December 31, 2009 and 2008, respectively.

The Partnership participates in oil and gas activities through a Drilling
Program Agreement (the Program). The Partnership and MD are parties to the Program Agreement. The costs and revenues of the Program are allocated to MD and the Partnership as follows:



|                                                                                                       |  |             |   |  |     |  
|------------------------------------------------------------------------------------------------------ |  | ----------- | - |  | --- | -
|                                                                                                       |  | Partnership |   |  | MD  |  
|Revenues:                                                                                              |  |             |   |  |     |  
|Proceeds from disposition of depreciable and depletable properties                                     |  | 60          | % |  | 40  | %
|All other revenues                                                                                     |  | 60          | % |  | 40  | %
|Costs and expenses:                                                                                    |  |             |   |  |     |  
|Organization and offering costs (1)                                                                    |  | 0           | % |  | 100 | %
|Lease acquisition costs (1)                                                                            |  | 0           | % |  | 100 | %
|Tangible and intangible drilling costs (1)                                                             |  | 100         | % |  | 0   | %
|Operating costs, reporting and legal expenses, general and administrative expenses and all other costs |  | 60          | % |  | 40  | %



|(1) | As noted above, pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which should approximate 30% of total
capital costs. To the extent that organization and offering costs and lease acquisition costs are less than 30% of total capital costs, MD is responsible for tangible drilling costs until its share of the Programs total capital costs reaches
approximately 30%. The Partnerships financial statements reflect its respective proportionate interest in the Program.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Index to Financial Statements

3. Supplemental Oil and Gas Information (unaudited):

The tables presented below provide supplemental information about oil and natural gas exploration and production activities.

Costs Incurred and Capitalized Costs:

Costs
incurred in oil and natural gas acquisition, exploration and development activities for the years ended December 31, 2009 and 2008 were:



|            |  |      |   |      |   |      
|----------- |  | ---- | - | ---- | - | -----
|            |  | 2009 |   | 2008
|Development |  | $    |  |      | $ | 4,221
|            |  |      |   |      |   |      

Capitalized costs related to oil and natural gas acquisition,
exploration and development activities for the years ended December 31, 2009 and 2008 were as follows:



|                                                                 |  |      |             |   |      |   |             |  
|---------------------------------------------------------------- |  | ---- | ----------- | - | ---- | - | ----------- | -
|                                                                 |  | 2009 |             |   | 2008 |  
|Cost of oil and natural gas properties at year-end:              |  |      |             |   |      |   |             |  
|Producing assets - Proved properties                             |  | $    | 19,242,286  |   |      | $ | 19,244,956  |  
|Asset retirement obligation                                      |  |      | 333,871     |   |      |   | 333,871     |  
|                                                                 |  |      |             |   |      |   |             |  
|Total capitalized cost                                           |  |      | 19,576,157  |   |      |   | 19,578,827  |  
|Accumulated depreciation, depletion, amortization and impairment |  |      | (17,034,414 | ) |      |   | (13,599,179 | )
|                                                                 |  |      |             |   |      |   |             |  
|Net capitalized costs                                            |  | $    | 2,541,743   |   |      | $ | 5,979,648   |  
|                                                                 |  |      |             |   |      |   |             |  

Estimated Net Quantities of Proved Oil and Gas Reserves:

Reserve estimates as well as certain information regarding future production and discounted cash flows were determined by the Partnerships independent petroleum consultants, Forrest A.
Garb & Associates Inc., in accordance with guidelines established by the Securities and Exchange Commission and the FASBs accounting standard. The Partnership considers reserve estimates to be reasonable; however, due to inherent
uncertainties and the limited nature of reservoir data, estimates of oil and gas reserves are imprecise and subject to change over time as additional information becomes available.

These reserve estimates have been prepared based on year-end prices and costs as of December 31, 2008 and the average first-of-the-month natural gas and oil prices for the twelve months ended
December 31, 2009 and the year-end costs as of December 31, 2009. The prior rules required that reserve estimates be calculated using last-day-of the-year pricing. Under those prior rules, reserve valuation at December 31, 2009
would be 58,295 barrels of oil and 3,280,389 mcf of gas, as compared to 54,164 barrels and 2,798,121 mcf under the new rules.



29



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##### Index to Financial Statements

There have been no favorable or adverse events that have caused a significant change in estimated proved
reserves since December 31, 2009. The Partnership has no long-term supply agreements or contracts with governments or authorities in which it acts as producer nor does it have any interest in oil and gas operations accounted for by the equity
method. All reserves are located onshore within the United States. All proved reserves are developed; therefore, the Partnership has no proved undeveloped properties for the years ended December 31, 2009 and 2008.



|                                            |  |                               |   |  |                   |  
|------------------------------------------- |  | ----------------------------- | - |  | ----------------- | -
|                                            |  | Crude Oil andCondensate(MBbl) |   |  | Natural Gas(MMcf) |  
|Proved Reserves:                            |  |                               |   |  |                   |  
|Balance at December 31, 2007 (1)            |  | 68                            |   |  | 4,255             |  
|                                            |  |                              
|Revisions to previous estimates             |  | (15                           | ) |  | (359              | )
|Extensions, discoveries and other additions |  | 0                             |   |  | 55                |  
|Production                                  |  | (3                            | ) |  | (316              | )
|                                            |  |                               |   |  |                   |  
|                                            |  |                              
|Balance at December 31, 2008 (1)            |  | 50                            |   |  | 3,635             |  
|                                            |  |                              
|Revisions to previous estimates             |  | 7                             |   |  | (601              | )
|Production                                  |  | (3                            | ) |  | (236              | )
|                                            |  |                               |   |  |                   |  
|                                            |  |                              
|Balance at December 31, 2009 (1)            |  | 54                            |   |  | 2,798             |  
|                                            |  |                               |   |  |                   |  



|(1) | All of these reserves are categorized as proved developed.
|--- | ----------------------------------------------------------

Technologies Used in Reserves Estimation

Proved reserves are those quantities of oil and natural
gas, which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and
government regulations. The term reasonable certainty implies a high degree of confidence that the quantities of oil technologies that an entity can use to establish reserves. The SEC now allows use of techniques that have been proved
effective by actual production from projects in the same reservoir or an analogous reservoir or by other evidence using reliable technology that establishes reasonable certainty. Reliable technology is a grouping of one or more technologies
(including computational methods) that have been field tested and has been demonstrated to provide reasonably certain results with consistency and repeatability in the formation being evaluated or in an analogous formation. To achieve reasonable
certainty, our technical team employs technologies that have been demonstrated to yield results with consistency and repeatability. The technologies and economic data used in the estimation of our proved reserves may include, but are not limited to,
empirical evidence through drilling results and well performance, well logs, geologic maps and available downhole and production data, seismic data, well test data and reservoir simulation modeling.



30



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##### Index to Financial Statements

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

INDEX TO EXHIBITS

The following documents are
incorporated by reference in response to Item 15(a)3.



|               |  |                                                                                                                                                                                                  
|-------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|EXHIBIT NUMBER |  | DESCRIPTION                                                                                                                                                                                      
|3.1            |  | Form of Certificate of Limited Partnership (filed as Exhibit 3.1 to Registration Statement on Form S-1, File No. 333-113340 and incorporated herein by reference)                                
|               | 
|3.2            |  | Form of Certificate of Amendment of the Certificate of Limited Partnership (filed as Exhibit 3.2 to Registration Statement on Form S-1, File No. 333-113340 and incorporated herein
by reference)
|               | 
|4.1            |  | Form of Agreement of Partnership (filed as Exhibit 4.1 to Registration Statement on Form S-1, File No. 333-113340 and incorporated herein by reference)                                          
|               | 
|10.1           |  | Form of Drilling Program Agreement (filed as Exhibit 10.1 to Registration Statement on Form S-1, File No. 333-113340 and incorporated herein by reference)                                       
|               | 
|10.3           |  | Form of Operating Agreement (filed as Exhibit 10.3 to Registration Statement on Form S-1, File No. 333-113340 and incorporated herein by reference)                                              
|               | 
|31.1           |  | Certification of CEO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.                                                                                                                      
|               | 
|31.2           |  | Certification of CFO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.                                                                                                                      
|               | 
|32.1           |  | Certification of CEO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.                                                                                                                      
|               | 
|32.2           |  | Certification of CFO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.                                                                                                                      
|               | 
|99.1           |  | Report of Forrest A. Garb & Associates, Inc.                                                                                                                                                     



31