##### Table of Contents

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549



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FORM 10-K



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

For the year ended December 31, 2006

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



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MEWBOURNE ENERGY PARTNERS 03-A, L.P.



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|                                                         |  |                                        
|-------------------------------------------------------- |  | ---------------------------------------
|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: None.



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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

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 is a large accelerated filer, an accelerated filer or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of
the Exchange Act. (Check one):

Large accelerated filer ̈Accelerated filer ̈Non-accelerated
filer  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 and general partnership interest of the registrant. Based on original purchase price the aggregate market value of limited and
general partnership interest 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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##### Table of Contents

TABLE OF CONTENTS



|                                             |  |                                                                                       |  |     
|-------------------------------------------- |  | ------------------------------------------------------------------------------------- |  | ----
|                                             |  |                                                                                       |  | Page
|PART I                                       |  |                                                                                       |  |     
|ITEM 1.                                      |  | Business                                                                              |  | 3   
|ITEM 1A.                                     |  | Risk Factors                                                                          |  | 4   
|ITEM 1B.                                     |  | Unresolved Staff Comments                                                             |  | 6   
|ITEM 2.                                      |  | Properties                                                                            |  | 6   
|ITEM 3.                                      |  | Legal Proceedings                                                                     |  | 6   
|ITEM 4.                                      |  | Submission of Matters to a Vote of Security Holders                                   |  | 6   
|                                             |  |                                                                                      
|PART II                                      |  |                                                                                       |  |     
|ITEM 5.                                      |  | Market for Registrants Common Equity and Related Stockholder Matters                 |  | 7   
|ITEM 6.                                      |  | Selected Financial Data                                                               |  | 7   
|ITEM 7.                                      |  | Managements Discussion and Analysis of Financial Condition and Results of Operations |  | 7   
|ITEM 7A.                                     |  | Quantitative and Qualitative Disclosures about Market Risk                            |  | 11  
|ITEM 8.                                      |  | Financial Statements and Supplementary Data                                           |  | 12  
|ITEM 9.                                      |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure  |  | 12  
|ITEM 9A.                                     |  | Controls and Procedures                                                               |  | 12  
|                                             |  |                                                                                      
|PART III                                     |  |                                                                                       |  |     
|ITEM 10.                                     |  | Directors and Executive Officers of the Registrant                                    |  | 13  
|ITEM 11.                                     |  | Executive Compensation                                                                |  | 15  
|ITEM 12.                                     |  | Security Ownership of Certain Beneficial Owners and Management                        |  | 15  
|ITEM 13.                                     |  | Certain Relationships and Related Transactions                                        |  | 15  
|ITEM 14.                                     |  | Principal Accountant Fees and Services                                                |  | 16  
|                                             |  |                                                                                      
|PART IV                                      |  |                                                                                       |  |     
|ITEM 15.                                     |  | Exhibits, Financial Statements, Financial Statement Schedules and Reports on Form 8-K |  | 16  
|                                             | 
|SIGNATURES                                   |  | 17                                                                                   
|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 |  |                                                                                      



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##### Table of Contents

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). In accordance with the laws of the state of Delaware, Mewbourne Development Corporation (MD), a Delaware Corporation,
has been appointed as the Registrants managing general partner. MD has no 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 Registrant 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 selected financial data in Item 6 and 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 Registrant
does not have long-term contracts with purchasers of its crude oil or natural gas. 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.



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##### Table of Contents

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 30, 2007, MOC employed 161 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.

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 88% of the Registrants reserves at December 31, 2006 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.



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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.

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 prices for oil and natural gas at that date. A significant decline in oil and natural gas prices from current levels, or other factors, without other
mitigating circumstances, could cause a future writedown of capitalized costs and a non-cash charge against future earnings.

The Registrants ceiling
test calculations for the year ended December 31, 2006 indicated an impairment of oil and natural gas properties of approximately $6.3 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.
| | - |  | ----------------------------------------------------------------

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.



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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 and the demand for oil and gas products.



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

None.



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

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, 2006, 65 wells had been drilled and were productive and 8 wells had been drilled and abandoned. The following table summarizes the
Registrants drilling activity for the years ended December 31, 2006, 2005 and 2004:



|                          |  |       |  |       |  |       |  |       |  |       |  |      
|------------------------- |  | ----- |  | ----- |  | ----- |  | ----- |  | ----- |  | -----
|                          |  | 2006  |  | 2005  |  | 2004 
|                          |  | Gross |  | Net   |  | Gross |  | Net   |  | Gross |  | Net  
|Development Wells         |  |       |  |       |  |       |  |       |  |       |  |      
|Oil and natural gas wells |  | 0     |  | 0.000 |  | 2     |  | 0.103 |  | 40    |  | 6.643
|Non-productive wells      |  | 0     |  | 0.000 |  | 1     |  | 0.035 |  | 0     |  | 0    

Reserve estimates were prepared by Forrest A Garb & Associates, Inc., the Registrants independent
petroleum consultants, in accordance with guidelines established by the Securities and Exchange Commission.



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

The Registrant is not aware of any pending legal proceedings to which it is a party.



|ITEM 4. | Submission of Matters to a Vote of Security Holders
|------- | ---------------------------------------------------

No matter was submitted to a vote of security holders during
the period ended December 31, 2006 covered by this report.



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##### Table of Contents

PART II



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

At March 30, 2007, the Registrant
had 18,000 outstanding limited and general partnerships interests held of record by 710 subscribers. There is no established public or organized trading market for the limited and general 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 limited and general partners during the years ended December 31, 2006, 2005 and 2004, were $3,705,705, $5,578,735 and $4,746,991,
respectively.



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

The following table sets forth selected financial data for the years ended
December 31, 2006, 2005, 2004 and for the period from February 19, 2003 (date of inception) through December 31, 2003:



|                                                                                                  |  |      |            |   |      |   |            |  |      |            |  |   |           
|------------------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- |  | ---- | ---------- |  | - | ----------
|Operating results                                                                                 |  | 2006 |            |   | 2005 |   | 2004       |  | 2003
|Oil and gas sales                                                                                 |  | $    | 4,062,540  |   |      | $ | 7,233,251  |  | $    | 7,458,793  |  | $ | 370,391   
|Net income (loss)                                                                                 |  |      | (4,467,006 | ) |      |   | 3,776,848  |  |      | 3,492,274  |  |   | 99,165    
|Basic and diluted net income (loss) per limited and general partner interest (18,000 outstanding) |  | $    | (248.17    | ) |      | $ | 209.82     |  | $    | 194.02     |  | $ | 5.51      
|                                                                                                  |  |      |            |   |      |   |            |  |      |            |  |   |           
|                                                                                                  |  |      |            |  
|At year-end:                                                                                      |  |      |            |   |      |   |            |  |      |            |  |   |           
|Total Assets                                                                                      |  | $    | 7,502,302  |   |      | $ | 15,588,777 |  | $    | 17,370,937 |  | $ | 18,392,821
|Cash Distributions per limited and general partner interest 18,000 outstanding)                   |  | $    | 205.88     |   |      | $ | 309.93     |  | $    | 263.73     |  | $ | 10.00     



|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.



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##### Table of Contents

Results of Operations

The
following table sets forth certain operating data for the years ended December 31, 2006, 2005 and 2004:



|                  |  |      |           |      |   |           |  |   |          
|----------------- |  | ---- | --------- | ---- | - | --------- |  | - | ---------
|                  |  | 2006 |           | 2005 |   | 2004     
|Oil and gas sales |  | $    | 4,062,540 |      | $ | 7,233,251 |  | $ | 7,458,796
|Barrels produced  |  |      | 6,153     |      |   | 11,502    |  |   | 18,591   
|Mcf produced      |  |      | 588,777   |      |   | 900,037   |  |   | 1,230,543
|Average price/bbl |  | $    | 63.81     |      | $ | 53.53     |  | $ | 39.05    
|Average price/mcf |  | $    | 6.23      |      | $ | 7.35      |  | $ | 5.47     

Year ended December 31, 2006 compared to the year ended December 31, 2005

Oil and natural gas sales. As shown in the table above, total oil and gas sales decreased $3,170,711 (44.0%) for the year ended December 31, 2006 as compared to
the year ended December 31, 2005. Of this decrease, $223,065 and $2,947,646, respectively, were related to decreases in volumes of oil and gas sold. Volumes of oil and gas sold decreased 5,349 bbls of oil and 311,260 mcf of gas for the year
ended December 31, 2006 as compared to the year ended December 31, 2005. The decrease in volumes of oil sold was primarily due to a substantial decline in the production of four wells. The decrease in volumes of gas sold was primarily due
to normal declines in production. The wells with a substantial decline in production are not expected to return to previous levels of production. The average oil price increased to $63.81 per bbl for the year ended December 31, 2006 from $53.53
per bbl for the year ended December 31, 2005. The average gas price decreased to $6.23 per mcf for the year ended December 31, 2006 from $7.35 per mcf for the year ended December 31, 2005.

Lease operating expense and production taxes. Lease operating expense decreased from $563,716 in 2005 to $494,639 in 2006. Production taxes decreased from $576,687 in
2005 to $307,106 in 2006. Production taxes decreased due to decreased oil and gas revenues for 2006.

Depreciation, depletion and amortization.
Depreciation, depletion and amortization decreased from $2,052,840 in 2005 to $1,208,828 in 2006. The decrease is primarily due to the decline in production volumes.

Cost ceiling write-down. There was a cost ceiling write-down of $6,268,874 in 2006. The cost ceiling write-down was caused by lower gas prices during the year. There was no cost ceiling write-down for 2005.

Year ended December 31, 2005 compared to the year ended December 31, 2004

Oil and natural gas sales. As shown in the table above, total oil and gas sales decreased $225,545 (3.0%) for the year ended December 31, 2005 as compared to the year ended December 31, 2004. Of this
decrease, $379,500 and $2,426,914, respectively, were related to decreases in volumes of oil and gas sold. Volumes of oil and gas sold decreased 7,089 bbls of oil and 330,506 mcf of gas for the year ended December 31, 2005 as compared to the
year ended December 31, 2004. The decrease in volumes of oil sold was primarily due to a substantial decline in the production of three wells partially offset by (i) the addition of two new wells and (ii) the substantial increase in
the production of one well added in the fourth quarter of 2004. The decrease in volumes of gas sold was primarily due to (i) normal declines in production and (ii) a substantial decline in the production of one well partially offset by the
addition of two new wells. The wells with a substantial decline in production are not expected to return to previous levels of production. These decreases were partially offset by increases of $269,115 and $2,311,754, respectively, related to
increases in the average prices of oil and gas sold. Average oil and gas prices increased to $53.53 per bbl and $7.35 per mcf for the year ended December 31, 2005 from $39.05 per bbl and $5.47 per mcf for the year ended December 31, 2004.



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##### Table of Contents

Interest income. Interest income decreased from $20,301 in 2004 to $2,325 in 2005 due to expenditures for the drilling of
oil and gas wells, which resulted in a decrease of capital available for investments.

Lease operating expense and production taxes. Lease operating
expense increased from $403,211 in 2004 to $563,716 in 2005. Lease operating expense increased primarily due to the addition of two new wells and the workover and repair of three wells during the period ended December 31, 2005. Production taxes
decreased from $593,726 in 2004 to $576,687 in 2005. Production taxes decreased due to decreased oil and gas revenues for 2005.

Depreciation, depletion
and amortization. Depreciation, depletion and amortization decreased from $2,739,865 in 2004 to $2,052,840 in 2005. The decrease is primarily due to the decline in production volumes.

Cost ceiling write-down. There were no cost ceiling write-downs for 2005 or 2004.

Liquidity and capital resources

Cash decreased by $486 during the year ended December 31, 2006. 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 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.

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 assuming year-end selling prices, year-end development and production costs and a 10 percent annual discount rate.

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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##### Table of Contents

Asset Retirement Obligations

In accordance with FAS 143, 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, 2006 and 2005, is as follows:



|                               |  |      |         |      |   |         |  
|------------------------------ |  | ---- | ------- | ---- | - | ------- | -
|                               |  | 2006 |         | 2005 |  
|Balance, beginning of period   |  | $    | 393,088 |      | $ | 379,022 |  
|Sale of oil and gas properties |  |      | 0       |      |   | (4,950  | )
|Liabilities incurred           |  |      | 0       |      |   | 2,905   |  
|Accretion expense              |  |      | 13,745  |      |   | 16,111  |  
|                               |  |      |         |      |   |         |  
|Balance, end of period         |  | $    | 406,833 |      | $ | 393,088 |  
|                               |  |      |         |      |   |         |  

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 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. Reimbursement to MOC for operator charges totaled $251,516, $271,919 and $834,580 for the years ended December 31, 2006, 2005
and 2004, 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. Under this arrangement, $151,110, $244,840 and 201,067 were allocated to
the Partnership during the years ended December 31, 2006, 2005 and 2004, respectively.



10



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##### Table of Contents

The Partnership participates in oil and gas activities through a Drilling Program Agreement (the Program).
The Partnership and MD are parties to the Program. 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) | Pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which 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.



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

Interest Rate Risk

The Partnership Agreement allows borrowings from banks or other financial sources of up to 20% of the total capital contributions to the Partnership without investor
approval. Should the Partnership elect to borrow monies for additional development activity on Partnership properties, it will be subject to the interest rate risk inherent in borrowing activities. Changes in interest rates could significantly
affect the Partnerships results of operations and the amount of net cash flow available for partner distributions. Also, to the extent that changes in interest rates affect general economic conditions, the Partnership will be affected by such
changes.

Commodity Price Risk

The Partnership does not
expect to engage in commodity futures trading or hedging activities or enter into derivative financial instrument transactions for trading or other speculative purposes. The Partnership currently expects to sell a vast majority of its
production from successful oil and gas wells on a month-to-month basis at market prices. Accordingly, the Partnership is at risk for the volatility in commodity prices inherent in the oil and gas industry, and the level of commodity prices will have
a significant impact on the Partnerships results of operations. For the year ended December 31, 2006, a 10% change in the price received for natural gas production would have had an approximate $367,000 impact on revenue.

Exchange Rate Risk

The Partnership currently has no income from foreign
sources or operations in foreign countries that would subject it to currency exchange rate risk. The Partnership does not currently expect to purchase any prospects located outside of either the United States or United States coastal waters in the
Gulf of Mexico.



11



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##### Table of Contents

|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 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
|-------- | -----------------------

MD maintains a system of controls and procedures designed to provide reasonable
assurance as to the reliability of the financial statements and other disclosures included in this report, as well as to safeguard assets from unauthorized use or disposition. MDs Chief Executive Officer and Chief Financial Officer have
evaluated the effectiveness of the design and operation of its disclosure controls and procedures with the assistance and participation of other members of management. Based upon that evaluation, MDs Chief Executive Officer and Chief Financial
Officer concluded that as of December 31, 2006 its disclosure controls and procedures are effective for gathering, analyzing and disclosing the information the Partnership is required to disclose in the reports it files under the Securities
Exchange Act of 1934 within the time periods specified in the SECs rules and forms. There have been no changes in MDs internal controls for the quarter ended December 31, 2006 or in other factors which have materially affected, or
is reasonable likely to materially affect the internal controls over financial reporting.



12



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##### Table of Contents

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 of December 31, 2006 |  | Position                                  
|Curtis W. Mewbourne |  | 71                          |  | President and Director                    
|                    |  |                            
|J. Roe Buckley      |  | 44                          |  | Vice President and Chief Financial Officer
|                    |  |                            
|Alan Clark          |  | 54                          |  | Treasurer and Controller                  
|                    |  |                            
|Michael F. Shepard  |  | 60                          |  | Secretary and General Counsel             
|                    |  |                            
|Dorothy M. Cuenod   |  | 46                          |  | Assistant Secretary and Director          
|                    |  |                            
|Ruth M. Buckley     |  | 45                          |  | Assistant Secretary and Director          
|                    |  |                            
|Julie M. Greene     |  | 43                          |  | Assistant Secretary and Director          



13



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##### Table of Contents

Curtis W. Mewbourne, age 71, 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 42 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 44, joined Mewbourne Holdings, Inc. in July, 1990 and serves as 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.

Alan Clark, age 54, 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 60, 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 46, 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 45, 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 43, 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.



14



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##### Table of Contents

|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 & Natureof BeneficialOwner |  | PercentofClass
|None           |  | None                   |  | N/A                               |  | N/A           



|(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, 2006, 2005 and 2004:



|                                                                                                                                               |  |      |         |      |   |         |  |   |          
|---------------------------------------------------------------------------------------------------------------------------------------------- |  | ---- | ------- | ---- | - | ------- |  | - | ---------
|                                                                                                                                               |  | 2006 |         | 2005 |   | 2004   
|Administrative & general expense and payment of well charges and supervision charges in accordance with standard industry operating
agreements |  | $    | 443,300 |      | $ | 516,759 |  | $ | 1,035,647

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.



15



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##### Table of Contents

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

In August 2006, the
Registrant changed audit firms, from PricewaterhouseCoopers LLP to BDO Seidman, LLP. The firm of PricewaterhouseCoopers was originally engaged at inception of the Registrant to serve as the Registrants independent registered public accounting
firm and subsequently retained for the annual audits through fiscal years ended December 31, 2005. The aggregate fees billed, including expenses, by BDO Seidman, LLP and PricewaterhouseCoopers LLP for 2006, 2005 and 2004 for various services
are set forth below:



|                       |  |                                  |        |      |   |        |  |   |       
|---------------------- |  | -------------------------------- | ------ | ---- | - | ------ |  | - | ------
|                       |  | For the Year Ended December, 31,
|                       |  | 2006                             |        | 2005 |   | 2004  
|Audit                  |  | $                                | 24,000 |      | $ | 30,814 |  | $ | 20,777
|Tax Return Preparation |  | $                                | 0      |      | $ | 3,500  |  | $ | 4,454 
|                       |  |                                  |        |      |   |        |  |   |       
|                       |  | $                                | 24,000 |      | $ | 34,314 |  | $ | 25,231
|                       |  |                                  |        |      |   |        |  |   |       

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:

Reports
of Independent Registered Public Accounting Firms

Balance sheets as of December 31, 2006 and 2005

Statements of operations for the years ended December 31, 2006, 2005 and 2004

Statements of changes in partners capital for the years ended December 31, 2006, 2005 and 2004

Statements of cash flows for the years ended December 31, 2006, 2005 and 2004

Notes to financial statements



| | 2. | Financial statement schedules
| | -- | -----------------------------

None.

All required information is in the financial statements or the notes thereto, or is not applicable or required.



| | 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.



16



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##### Table of Contents

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 |  | President/Director       |  | March 30, 2007
|Curtis W. Mewbourne     |  |                          |  |               
|                        |  |                         
|/s/ J. Roe Buckley      |  | Vice President           |  | March 30, 2007
|J. Roe Buckley          |  | Chief Financial Officer  |  |               
|                        |  |                         
|/s/ Alan Clark          |  | Treasurer and Controller |  | March 30, 2007
|Alan Clark              |  |                          |  |               
|                        |  |                         
|/s/ Dorothy M. Cuenod   |  | Director                 |  | March 30, 2007
|Dorothy M. Cuenod       |  |                          |  |               
|                        |  |                         
|/s/ Ruth M. Buckley     |  | Director                 |  | March 30, 2007
|Ruth M. Buckley         |  |                          |  |               
|                        |  |                         
|/s/ Julie M. Greene     |  | Director                 |  | March 30, 2007
|Julie M. Greene         |  |                          |  |               

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.



17



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##### Table of Contents

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

FINANCIAL STATEMENTS

WITH REPORTS OF INDEPENDENT REGISTERED PUBLIC
ACCOUNTING FIRMS

For the years ended December 31, 2006 and 2005



18



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##### Table of Contents

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:

In our opinion, the accompanying balance sheet and the related statements of operations, of changes in partners capital and of cash flows present fairly, in all
material respects, the financial position of Mewbourne Energy Partners 03-A, L.P. at December 31, 2005 and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2005 in conformity with
accounting principles generally accepted in the United States of America. 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 of these statements 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. An audit 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, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.



|                              
|------------------------------
|/s/ PricewaterhouseCoopers LLP
|                              
|Dallas, Texas                 
|March 31, 2006                



19



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##### Table of Contents

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:

We have audited the accompanying balance sheet of Mewbourne Energy Partners 03-A, L.P. as of December 31, 2006 and the related statements of operations, of changes
in partners capital, and cash flows for the year then ended. These financial statements are the responsibility of the Partnerships management. Our responsibility is to express an opinion on these financial statements based on our audit.

We conducted our audit 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 Partnership is not required to have, nor were we engaged to perform, an audit of its internal control over
financial reporting. Our audit 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 Partnership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 audit provides 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, 2006, and the results of its operations and its cash flows for the year then ended, in conformity with accounting principles generally accepted in the United States of America.



|                    
|--------------------
|/s/ BDO Seidman, LLP
|                    
|Dallas, Texas       
|March 30, 2007      



20



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##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

BALANCE SHEETS

December 31, 2006 and 2005



|                                                                      |  |      |             |      |   |            |  
|--------------------------------------------------------------------- |  | ---- | ----------- | ---- | - | ---------- | -
|                                                                      |  | 2006 |             | 2005 |  
|ASSETS                                                                |  |      |             |      |   |            |  
|Cash and cash equivalents                                             |  | $    | 554         |      | $ | 1,040      |  
|Accounts receivable, affiliate                                        |  |      | 617,225     |      |   | 1,430,737  |  
|                                                                      |  |      |             |      |   |            |  
|Total current assets                                                  |  |      | 617,779     |      |   | 1,431,777  |  
|                                                                      |  |      |             |      |   |            |  
|Oil and gas properties at cost, full cost method                      |  |      | 19,411,664  |      |   | 19,206,439 |  
|Less accumulated depreciation, depletion, amortization and impairment |  |      | (12,527,141 |      |   | (5,049,439 | )
|                                                                      |  |      |             |      |   |            |  
|                                                                      |  |      | 6,884,523   |      |   | 14,157,000 |  
|                                                                      |  |      |             |      |   |            |  
|Total assets                                                          |  | $    | 7,502,302   |      | $ | 15,588,777 |  
|                                                                      |  |      |             |      |   |            |  
|                                                                      |  |     
|LIABILITIES AND PARTNERS CAPITAL                                     |  |      |             |      |   |            |  
|Accounts payable, affiliate                                           |  | $    | 405,619     |      | $ | 333,128    |  
|                                                                      |  |      |             |      |   |            |  
|Asset retirement obligation-plugging liability                        |  |      | 406,833     |      |   | 393,088    |  
|                                                                      |  |      |             |      |   |            |  
|Partners capital                                                     |  |      |             |      |   |            |  
|Limited partners                                                      |  |      | 6,689,850   |      |   | 14,862,561 |  
|                                                                      |  |      |             |      |   |            |  
|Total partners capital                                               |  |      | 6,689,850   |      |   | 14,862,561 |  
|                                                                      |  |      |             |      |   |            |  
|Total liabilities and partners capital                               |  | $    | 7,502,302   |      | $ | 15,588,777 |  
|                                                                      |  |      |             |      |   |            |  

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



21



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##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

STATEMENTS OF OPERATIONS

For the years ended December 31, 2006, 2005 and 2004



|                                                                             |  |      |            |   |      |   |           |  |   |          
|---------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | --------- |  | - | ---------
|                                                                             |  | 2006 |            |   | 2005 |   | 2004     
|Revenues and other income:                                                   |  |      |            |   |      |   |           |  |   |          
|Oil and gas sales                                                            |  | $    | 4,062,540  |   |      | $ | 7,233,251 |  | $ | 7,458,796
|Interest income                                                              |  |      | 3,225      |   |      |   | 2,325     |  |   | 20,301   
|                                                                             |  |      |            |   |      |   |           |  |   |          
|                                                                             |  |      | 4,065,765  |   |      |   | 7,235,576 |  |   | 7,479,097
|                                                                             |  |      |            |   |      |   |           |  |   |          
|Expenses:                                                                    |  |      |            |   |      |   |           |  |   |          
|Lease operating expense                                                      |  |      | 494,639    |   |      |   | 563,716   |  |   | 403,211  
|Production taxes                                                             |  |      | 307,106    |   |      |   | 576,687   |  |   | 593,726  
|Administrative and general expense                                           |  |      | 239,579    |   |      |   | 249,374   |  |   | 225,980  
|Depreciation, depletion, and amortization                                    |  |      | 1,208,828  |   |      |   | 2,052,840 |  |   | 2,739,865
|Cost ceiling write-down                                                      |  |      | 6,268,874  |   |      |   | 0         |  |   | 0        
|Asset retirement obligation accretion                                        |  |      | 13,745     |   |      |   | 16,111    |  |   | 24,041   
|                                                                             |  |      |            |   |      |   |           |  |   |          
|                                                                             |  |      | 8,532,771  |   |      |   | 3,458,728 |  |   | 3,986,823
|                                                                             |  |      |            |   |      |   |           |  |   |          
|Net income (loss)                                                            |  | $    | (4,467,006 | ) |      | $ | 3,776,848 |  | $ | 3,492,274
|                                                                             |  |      |            |   |      |   |           |  |   |          
|Allocation of net income (loss):                                             |  |      |            |   |      |   |           |  |   |          
|General partners                                                             |  | $    | 0          |   |      | $ | 0         |  | $ | 3,125,003
|                                                                             |  |      |            |   |      |   |           |  |   |          
|Limited partners                                                             |  | $    | (4,467,006 | ) |      | $ | 3,776,848 |  | $ | 367,271  
|                                                                             |  |      |            |   |      |   |           |  |   |          
|Basic and diluted net income (loss) per limited and general partner interest |  |      |            |   |      |   |           |  |   |          
|(18,000 interests outstanding)                                               |  | $    | (248.17    | ) |      | $ | 209.82    |  | $ | 194.02   
|                                                                             |  |      |            |   |      |   |           |  |   |          

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



22



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##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

STATEMENT OF CHANGES IN PARTNERS CAPITAL

For the years ended December 31,
2006, 2005 and 2004



|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|-------------------------------------------------------------------- |  | --------------- | ----------- | - | --------------- | - | ---------- | ----- |  | - | ---------- | -
|                                                                     |  | GeneralPartners |             |   | LimitedPartners |   |            | Total | 
|Balance at December 31, 2003                                         |  |                 | 16,034,671  |   |                 |   | 1,884,494  |       |  |   | 17,919,165 |  
|Cash distributions                                                   |  |                 | (4,247,766  | ) |                 |   | (499,225   | )     |  |   | (4,746,991 | )
|Net income                                                           |  |                 | 3,125,003   |   |                 |   | 367,271    |       |  |   | 3,492,274  |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at December 31, 2004                                         |  |                 | 14,911,908  |   |                 |   | 1,752,540  |       |  |   | 16,664,448 |  
|Conversion of general partner interests to limited partner interests |  |                 | (14,911,908 | ) |                 |   | 14,911,908 |       |  |   | 0          |  
|Cash distributions                                                   |  |                 | 0           |   |                 |   | (5,578,735 | )     |  |   | (5,578,735 | )
|Net income                                                           |  |                 | 0           |   |                 |   | 3,776,848  |       |  |   | 3,776,848  |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at December 31, 2005                                         |  |                 | 0           |   |                 |   | 14,862,561 |       |  |   | 14,862,561 |  
|Cash distributions                                                   |  |                 | 0           |   |                 |   | (3,705,705 | )     |  |   | (3,705,705 | )
|Net loss                                                             |  |                 | 0           |   |                 |   | (4,467,006 | )     |  |   | (4,467,006 | )
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at December 31, 2006                                         |  | $               | 0           |   |                 | $ | 6,689,850  |       |  | $ | 6,689,850  |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  

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



23



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##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

STATEMENTS OF CASH FLOWS

For the years ended December 31, 2006, 2005, and 2004



|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|---------------------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | ---- |  | - | ---------- | -
|                                                                                                     |  | 2006 |            |   | 2005 |   |            | 2004 | 
|Cash flows from operating activities:                                                                |  |      |            |   |      |   |            |      |  |   |            |  
|Net income (loss)                                                                                    |  | $    | (4,467,006 | ) |      | $ | 3,776,848  |      |  | $ | 3,492,274  |  
|Adjustment to reconcile net income (loss) to net cash provided by operating activities:              |  |      |            |   |      |   |            |      |  |   |            |  
|Depreciation, depletion and amortization                                                             |  |      | 1,208,828  |   |      |   | 2,052,840  |      |  |   | 2,739,865  |  
|Cost ceiling write-down                                                                              |  |      | 6,268,874  |   |      |   | 0          |      |  |   | 0          |  
|Asset retirement obligation accretion                                                                |  |      | 13,745     |   |      |   | 16,111     |      |  |   | 24,041     |  
|Changes in operating assets and liabilities:                                                         |  |      |            |   |      |   |            |      |  |   |            |  
|Accounts receivable, affiliate                                                                       |  |      | 813,512    |   |      |   | 259,059    |      |  |   | (1,389,993 | )
|Accounts receivable, other                                                                           |  |      | 0          |   |      |   | 33         |      |  |   | 7,416      |  
|Accounts payable, affiliate                                                                          |  |      | 72,491     |   |      |   | 5,661      |      |  |   | (1,050     | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|Net cash provided by operating activities                                                            |  |      | 3,910,444  |   |      |   | 6,110,552  |      |  |   | 4,872,553  |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|                                                                                                     |  |      |           
|Cash flows from investing activities:                                                                |  |      |            |   |      |   |            |      |  |   |            |  
|Purchase and development of oil and gas properties                                                   |  |      | (205,225   | ) |      |   | (534,429   | )    |  |   | (5,628,161 | )
|Prepaid well cost                                                                                    |  |      | 0          |   |      |   | 0          |      |  |   | (45,685    | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|Net cash used in investing activities                                                                |  |      | (205,225   | ) |      |   | (534,429   | )    |  |   | (5,673,846 | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|                                                                                                     |  |      |           
|Cash flows from financing activities:                                                                |  |      |            |   |      |   |            |      |  |   |            |  
|Cash distributions to partners                                                                       |  |      | (3,705,705 | ) |      |   | (5,578,735 | )    |  |   | (4,746,991 | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|Net cash used in financing activities                                                                |  |      | (3,705,705 | ) |      |   | (5,578,735 | )    |  |   | (4,746,991 | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|Net decrease in cash and cash equivalents                                                            |  |      | (486       | ) |      |   | (2,612     | )    |  |   | (5,548,284 | )
|Cash and cash equivalents, beginning of period                                                       |  |      | 1,040      |   |      |   | 3,652      |      |  |   | 5,551,936  |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|Cash and cash equivalents, end of period                                                             |  | $    | 554        |   |      | $ | 1,040      |      |  | $ | 3,652      |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  
|Supplemental Cash Flow Information:                                                                  |  |      |            |   |      |   |            |      |  |   |            |  
|Non-cash increase to oil & gas properties related to asset retirement obligation liabilities assumed |  | $    | 0          |   |      | $ | (2,045     | )    |  | $ | 209,842    |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |            |  

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



24



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##### Table of Contents

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 interests and $1,892,995 were sold to 66 subscribers as limited partner interests. During 2005 all general partner equity interests were converted to limited partner equity interests. The managing
general partner has no equity interest in the partnership.

The Programs sole business is the development and production of oil and gas with a
concentration on gas. Substantially all of the Programs gas reserves are 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, 2006 and 2005 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 write-down for December 31, 2006 of
$6,268,874. There were no cost ceiling write-downs for the years ended December 31, 2005 and 2004.

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 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.



25



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##### Table of Contents

Cash and cash equivalents

The Partnership considers all highly liquid investments, those with original maturities of three months or less at the date of acquisition, to be cash equivalents. 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.

Asset Retirement Obligations

In accordance with FAS 143, 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, 2006 and 2005, is
as follows:



|                               |  |      |         |      |   |         |  
|------------------------------ |  | ---- | ------- | ---- | - | ------- | -
|                               |  | 2006 |         | 2005 |  
|Balance, beginning of period   |  | $    | 393,088 |      | $ | 379,022 |  
|Sale of oil and gas properties |  |      | 0       |      |   | (4,950  | )
|Liabilities incurred           |  |      | 0       |      |   | 2,905   |  
|Accretion expense              |  |      | 13,745  |      |   | 16,111  |  
|                               |  |      |         |      |   |         |  
|Balance, end of period         |  | $    | 406,833 |      | $ | 393,088 |  
|                               |  |      |         |      |   |         |  

Oil and Gas Sales

The Programs oil and condensate production is sold, title passed, 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, 2006, 2005 and 2004, no material gas imbalances between the Partnership and other working interest owners existed.

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.



|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 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.



26



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##### Table of Contents

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 for 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. Reimbursement to MOC for operator charges totaled $251,516, $271,919 and $834,580 for the
years ended December 31, 2006, 2005 and 2004. 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. Under this arrangement, $151,110,
$244,840 and $201,067 were allocated to the Partnership during the years ended December 31, 2006, 2005 and 2004 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) | Pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which will 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.



27



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##### Table of Contents

|3. | Reconciliation of Net income per Statements of Operations with Net income (loss) per Federal Income Tax Return:
|-- | ---------------------------------------------------------------------------------------------------------------

The following is a reconciliation of net income per statements of operations with net income (loss) per federal income tax return for the years ended December 31,
2006, 2005 and 2004:



|                                                                                                                  |  |      |            |   |      |   |           |      |  |   |            |  
|----------------------------------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | --------- | ---- |  | - | ---------- | -
|                                                                                                                  |  | 2006 |            |   | 2005 |   |           | 2004 | 
|Net income per statements of operations                                                                           |  | $    | (4,467,006 | ) |      | $ | 3,776,848 |      |  | $ | 3,492,274  |  
|Intangible development costs capitalized for financial reporting purposes and expensed for tax reporting purposes |  |      | (178,893   | ) |      |   | (344,072  | )    |  |   | (4,820,465 | )
|Dry hole costs capitalized for financial reporting purposes and expensed for tax reporting purposes               |  |      | (904       | ) |      |   | (57,157   | )    |  |   | (24,632    | )
|Depreciation, depletion and amortization for financial reporting purposes over amounts for tax reporting purposes |  |      | 852,102    |   |      |   | 1,559,095 |      |  |   | 2,121,829  |  
|Cost ceiling write-down for financial reporting purposes                                                          |  |      | 6,268,874  |   |      |   | 0         |      |  |   | 0          |  
|Gain on sale of oil and gas equipment recognized for tax reporting purposes                                       |  |      | 5,811      |   |      |   | 3,698     |      |  |   | 129,525    |  
|ARO accretion expense for financial reporting purposes                                                            |  |      | 13,745     |   |      |   | 16,111    |      |  |   | 24,041     |  
|Other                                                                                                             |  |      | (124,001   | ) |      |   | 93,299    |      |  |   | 0          |  
|                                                                                                                  |  |      |            |   |      |   |           |      |  |   |            |  
|Net income (loss) per federal income tax return before tentative tax depletion                                    |  | $    | 2,369,728  |   |      | $ | 5,047,822 |      |  | $ | 922,572    |  
|                                                                                                                  |  |      |            |   |      |   |           |      |  |   |            |  

The Partnerships financial reporting bases of its net assets exceeded the tax bases of its net assets by
$5,633,279, $12,831,653 and $13,979,384 at December 31, 2006, 2005 and 2004, respectively.



|4. | Quarterly Financial Data (unaudited):
|-- | -------------------------------------

Summarized unaudited quarterly
financial data for 2006 and 2005 are as follows:



|                                                                                                            |  |                |            |      |              |   |           |                   |  |   |                  |      |  |   |          
|----------------------------------------------------------------------------------------------------------- |  | -------------- | ---------- | ---- | ------------ | - | --------- | ----------------- |  | - | ---------------- | ---- |  | - | ---------
|                                                                                                            |  | Quarters Ended
|                                                                                                            |  | March 31,2006  |            |      | June 30,2006 |   |           | September 30,2006 |  |   | December 31,2006
|Total revenues                                                                                              |  | $              | 1,269,575  |      |              | $ | 912,961   |                   |  | $ | 996,173          |      |  | $ | 883,832  
|Gross profit (loss) (a)                                                                                     |  |                | (1,404,092 | )(b) |              |   | (326,183  | )(c)              |  |   | (3,182,573       | )(d) |  |   | 449,067  
|Net income (loss)                                                                                           |  |                | (1,405,214 | )(b) |              |   | (327,165  | )(c)              |  |   | (3,183,168       | )(d) |  |   | 448,541  
|Basic and diluted net income (loss) per limited and general partner interest (18,000 interests outstanding) |  | $              | (78.07     | )    |              | $ | (18.18    | )                 |  | $ | (176.84          | )    |  | $ | 24.92    
|                                                                                                            | 
|                                                                                                            |  | Quarters Ended
|                                                                                                            |  | March 31,2005  |            |      | June 30,2005 |   |           | September 30,2005 |  |   | December 31,2005
|Total revenues                                                                                              |  | $              | 1,551,056  |      |              | $ | 1,499,187 |                   |  | $ | 1,747,320        |      |  | $ | 2,435,688
|Gross profit (a)                                                                                            |  |                | 697,401    |      |              |   | 676,244   |                   |  |   | 980,102          |      |  |   | 1,425,427
|Net income                                                                                                  |  |                | 696,217    |      |              |   | 675,802   |                   |  |   | 979,666          |      |  |   | 1,425,163
|Basic and diluted net income per limited and general partner interest (18,000 interests outstanding)        |  | $              | 38.68      |      |              | $ | 37.54     |                   |  | $ | 54.43            |      |  | $ | 79.18    

---

|(a) | Total revenue less operating costs.
|--- | -----------------------------------

|(b) | Includes cost ceiling write-down of 1,971,537.
|--- | ----------------------------------------------

|(c) | Includes cost ceiling write-down of 705,339.
|--- | --------------------------------------------

|(d) | Includes cost ceiling write-down of 3,591,998.
|--- | ----------------------------------------------



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##### Table of Contents

|5. | Supplemental Oil and Gas Information (unaudited):
|-- | -------------------------------------------------

The tables presented
below provide supplemental information about oil and natural gas exploration and production activities as defined by SFAS No. 69, Disclosures about Oil and Gas Producing Activities.

Costs Incurred and Capitalized Costs:

Costs incurred in oil
and natural gas acquisition, exploration and development activities for the years ended December 31, 2006, 2005 and 2004:



|                             |  |      |         |      |   |         |  |   |          
|---------------------------- |  | ---- | ------- | ---- | - | ------- |  | - | ---------
|                             |  | 2006 |         | 2005 |   | 2004   
|Costs incurred for the year: |  |      |         |      |   |         |  |   |          
|Development                  |  | $    | 205,226 |      | $ | 580,114 |  | $ | 9,756,584
|                             |  |      |         |      |   |         |  |   |          

Capitalized costs related to oil and natural gas acquisition, exploration and development activities for the years
ended December 31, 2006 and 2005 are as follows:



|                                                                 |  |      |             |   |      |   |            |  
|---------------------------------------------------------------- |  | ---- | ----------- | - | ---- | - | ---------- | -
|                                                                 |  | 2006 |             |   | 2005 |  
|Cost of oil and natural gas properties at year-end:              |  |      |             |   |      |   |            |  
|Producing assets  Proved properties                             |  | $    | 19,067,446  |   |      | $ | 18,862,221 |  
|Asset retirement obligation                                      |  |      | 344,218     |   |      |   | 344,218    |  
|                                                                 |  |      |             |   |      |   |            |  
|Total capitalized cost                                           |  |      | 19,411,664  |   |      |   | 19,206,439 |  
|Accumulated depreciation, depletion, amortization and impairment |  |      | (12,527,141 | ) |      |   | (5,049,439 | )
|                                                                 |  |      |             |   |      |   |            |  
|Net capitalized costs                                            |  | $    | 6,884,523   |   |      | $ | 14,157,000 |  
|                                                                 |  |      |             |   |      |   |            |  

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 and MOCs petroleum reservoir engineers. 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.

There have been no favorable or adverse events that have caused a significant
change in estimated proved reserves since December 31, 2006. 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.



29



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##### Table of Contents

Proved Reserves:



|                                           |  |                                        |   |  |                                       |  
|------------------------------------------ |  | -------------------------------------- | - |  | ------------------------------------- | -
|                                           |  | Crude Oil and Condensate (bbls of Oil) |   |  | Natural Gas (Thousands of Cubic
Feet) |  
|                                           |  | (In thousands)                         |  
|Balance at December 31, 2003 (1)           |  | 50                                     |   |  | 3,274                                 |  
|Revisions to previous estimates            |  | 0                                      |   |  | (200                                  | )
|Extension, discoveries and other additions |  | 53                                     |   |  | 5,126                                 |  
|Production                                 |  | (19                                    | ) |  | (1,231                                | )
|                                           |  |                                        |   |  |                                       |  
|Balance at December 31, 2004 (1)           |  | 84                                     |   |  | 6,969                                 |  
|Revisions to previous estimates            |  | 6                                      |   |  | (377                                  | )
|Extension, discoveries and other additions |  | 4                                      |   |  | 186                                   |  
|Production                                 |  | (12                                    | ) |  | (900                                  | )
|                                           |  |                                        |   |  |                                       |  
|Balance at December 31, 2005 (1)           |  | 82                                     |   |  | 5,878                                 |  
|Revisions to previous estimates            |  | (5                                     | ) |  | (209                                  | )
|Extension, discoveries and other additions |  | 1                                      |   |  | 35                                    |  
|Production                                 |  | (7                                     | ) |  | (589                                  | )
|                                           |  |                                        |   |  |                                       |  
|Balance at December 31, 2006 (1)           |  | 71                                     |   |  | 5,115                                 |  
|                                           |  |                                        |   |  |                                       |  

---

|(1) | All of these reserves are categorized as proved developed as of December 31, 2006, 2005 and 2004.
|--- | -------------------------------------------------------------------------------------------------



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##### Table of Contents

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

INDEX TO EXHIBITS

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



|              |  |                                                                                                                                                                                                    
|------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|EXHIBITNUMBER |  | DESCRIPTION                                                                                                                                                                                        
|3.1           |  | Form of Certificate of Limited Partnership (filed as Exhibit 3.1 to Registration Statement on Form S-1, File No. 333-85994-01 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. 333-85994-01 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. 333-85994-01 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. 333-85994-01 and incorporated herein by reference)                                       
|              | 
|10.4          |  | Form of Operating Agreement (filed as Exhibit 10.4 to Registration Statement on Form S-1, File No. 333-85994-01 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.                                                                                                                        



31