##### Table of Contents

---

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549



---

FORM 10-Q



---



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

For the quarterly period ended September 30, 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



---

MEWBOURNE ENERGY PARTNERS 03-A, L.P.



---



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



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

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

Not Applicable

(Former name, former
address and former fiscal year, if changed since last report)



---

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 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



---



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

INDEX



|                |  |                                                                                                                                                                 |  |   
|--------------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | --
|                |  | Page No.                                                                                                                                                       
|Part I       -  |  | Financial Information                                                                                                                                           |  |   
|                |  |                                                                                                                                                                
|Item 1.         |  | Financial Statements                                                                                                                                            |  |   
|                |  |                                                                                                                                                                
|                |  | Condensed Balance Sheets -September 30, 2006 (Unaudited) and December 31, 2005                                                                                  |  | 3 
|                |  |                                                                                                                                                                
|                |  | Condensed Statements of Operations (Unaudited) -For the three months ended September 30, 2006 and 2005 and    the nine months ended September 30, 2006 and 2005 |  | 4 
|                |  |                                                                                                                                                                
|                |  | Condensed Statements of Cash Flows (Unaudited) -For the nine months ended September 30, 2006 and 2005                                                           |  | 5 
|                |  |                                                                                                                                                                
|                |  | Condensed Statement of Changes In Partners Capital (Unaudited) -For the nine months ended September 30, 2006                                                   |  | 6 
|                |  |                                                                                                                                                                
|                |  | Notes to Condensed Financial Statements                                                                                                                         |  | 7 
|                |  |                                                                                                                                                                
|Item 2.         |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                                                           |  | 10
|                |  |                                                                                                                                                                
|Item 3.         |  | Quantitative and Qualitative Disclosures about Market Risk                                                                                                      |  | 13
|                |  |                                                                                                                                                                
|Item 4.         |  | Disclosure Controls and Procedures                                                                                                                              |  | 13
|                |  |                                                                                                                                                                
|Part II       - |  | Other Information                                                                                                                                               |  |   
|                |  |                                                                                                                                                                
|Item 1.         |  | Legal Proceedings                                                                                                                                               |  | 13
|                |  |                                                                                                                                                                
|Item 6.         |  | Exhibits and Reports on Form 8-K                                                                                                                                |  | 14



2



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

Part I - Financial Information

Item 1. Financial Statements

CONDENSED BALANCE SHEETS

September 30, 2006 and December 31, 2005



|                                                                      |  |                   |             |   |                  |   |            |  
|--------------------------------------------------------------------- |  | ----------------- | ----------- | - | ---------------- | - | ---------- | -
|                                                                      |  | September 30,2006 |             |   | December 31,2005 |  
|                                                                      |  | (Unaudited)       |             |   |                  |  
|ASSETS                                                                |  |                   |             |   |                  |   |            |  
|                                                                      |  |                  
|Cash                                                                  |  | $                 | 5,797       |   |                  | $ | 1,040      |  
|Accounts receivable, affiliate                                        |  |                   | 689,346     |   |                  |   | 1,430,737  |  
|                                                                      |  |                   |             |   |                  |   |            |  
|Total current assets                                                  |  |                   | 695,143     |   |                  |   | 1,431,777  |  
|                                                                      |  |                   |             |   |                  |   |            |  
|Oil and gas properties at cost, full cost method                      |  |                   | 19,330,976  |   |                  |   | 19,206,439 |  
|Less accumulated depreciation, depletion, amortization and impairment |  |                   | (12,357,353 | ) |                  |   | (5,049,439 | )
|                                                                      |  |                   |             |   |                  |   |            |  
|                                                                      |  |                   | 6,973,623   |   |                  |   | 14,157,000 |  
|                                                                      |  |                   |             |   |                  |   |            |  
|Total assets                                                          |  | $                 | 7,668,766   |   |                  | $ | 15,588,777 |  
|                                                                      |  |                   |             |   |                  |   |            |  
|LIABILITIES AND PARTNERS CAPITAL                                     |  |                   |             |   |                  |   |            |  
|Accounts payable, affiliate                                           |  | $                 | 387,942     |   |                  | $ | 333,128    |  
|                                                                      |  |                   |             |   |                  |   |            |  
|Asset retirement obligation plugging liability                        |  |                   | 403,513     |   |                  |   | 393,088    |  
|                                                                      |  |                   |             |   |                  |   |            |  
|Partners capital                                                     |  |                   | 6,877,311   |   |                  |   | 14,862,561 |  
|                                                                      |  |                   |             |   |                  |   |            |  
|Total liabilities and partners capital                               |  | $                 | 7,668,766   |   |                  | $ | 15,588,777 |  
|                                                                      |  |                   |             |   |                  |   |            |  

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



3



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

CONDENSED STATEMENTS OF OPERATIONS

For the three months ended September 30, 2006 and 2005 and

the nine months ended September 30, 2006 and 2005

(Unaudited)



|                                                                                                |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          
|----------------------------------------------------------------------------------------------- |  | ------------------------------- | ---------- | ------------------------------ | ---- | - | --------- |  | - | ---------- | - |  | - | ---------
|                                                                                                |  | Three Months EndedSeptember 30, |            | Nine Months EndedSeptember 30,
|                                                                                                |  | 2006                            |            |                                | 2005 |   | 2006      |  |   | 2005      
|Revenues and other income:                                                                      |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          
|                                                                                                |  |                                 |            |                               
|Oil and gas sales                                                                               |  | $                               | 1,028,999  |                                |      | $ | 1,715,503 |  | $ | 3,178,710  |   |  | $ | 4,797,563
|Interest income                                                                                 |  |                                 | 595        |                                |      |   | 436       |  |   | 2,699      |   |  |   | 2,062    
|                                                                                                |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          
|Total revenues and other income                                                                 |  |                                 | 1,029,594  |                                |      |   | 1,715,939 |  |   | 3,181,409  |   |  |   | 4,799,625
|                                                                                                |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          
|Expenses:                                                                                       |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          
|                                                                                                |  |                                 |            |                               
|Lease operating expense                                                                         |  |                                 | 114,462    |                                |      |   | 113,852   |  |   | 334,895    |   |  |   | 341,381  
|Production taxes                                                                                |  |                                 | 81,942     |                                |      |   | 138,097   |  |   | 245,167    |   |  |   | 376,756  
|Administrative and general expense                                                              |  |                                 | 43,471     |                                |      |   | 57,596    |  |   | 198,555    |   |  |   | 209,795  
|Depreciation, depletion, and amortization                                                       |  |                                 | 347,730    |                                |      |   | 441,502   |  |   | 1,039,040  |   |  |   | 1,506,676
|Cost ceiling write-down                                                                         |  |                                 | 3,591,998  |                                |      |   |          |  |   | 6,268,874  |   |  |   |         
|Asset retirement obligation accretion                                                           |  |                                 | 3,418      |                                |      |   | 3,437     |  |   | 10,425     |   |  |   | 13,331   
|                                                                                                |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          
|Net income (loss)                                                                               |  | $                               | (3,153,427 | )                              |      | $ | 961,455   |  | $ | (4,915,547 | ) |  | $ | 2,351,686
|                                                                                                |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          
|Basic and diluted net income (loss) per limited partner interest (18,000 interests outstanding) |  | $                               | (175.19    | )                              |      | $ | 53.41     |  | $ | (273.09    | ) |  | $ | 130.65   
|                                                                                                |  |                                 |            |                                |      |   |           |  |   |            |   |  |   |          

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



4



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

CONDENSED STATEMENTS OF CASH FLOWS

For the nine months ended September 30, 2006 and 2005

(Unaudited)



|                                                                                         |  |      |            |   |      |   |            |  
|---------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                                                                         |  | 2006 |            |   | 2005 |  
|Cash flows from operating activities:                                                    |  |      |            |   |      |   |            |  
|Net income (loss)                                                                        |  | $    | (4,915,547 | ) |      | $ | 2,351,686  |  
|Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |      |            |   |      |   |            |  
|Depreciation, depletion, and amortization                                                |  |      | 1,039,040  |   |      |   | 1,506,676  |  
|Cost ceiling write-down                                                                  |  |      | 6,268,874  |   |      |   |           |  
|Asset retirement obligation accretion                                                    |  |      | 10,425     |   |      |   | 13,331     |  
|Changes in operating assets and liabilities:                                             |  |      |            |   |      |   |            |  
|Accounts receivable, affiliate                                                           |  |      | 741,391    |   |      |   | 450,011    |  
|Accounts payable, affiliate                                                              |  |      | 54,814     |   |      |   | 52,544     |  
|                                                                                         |  |      |            |   |      |   |            |  
|Net cash provided by operating activities                                                |  |      | 3,198,997  |   |      |   | 4,374,248  |  
|                                                                                         |  |      |            |   |      |   |            |  
|Cash flows from investing activities:                                                    |  |      |            |   |      |   |            |  
|Purchase and development of oil and gas properties                                       |  |      | (124,537   | ) |      |   | (397,250   | )
|                                                                                         |  |      |            |   |      |   |            |  
|Net cash used in investing activities                                                    |  |      | (124,537   | ) |      |   | (397,250   | )
|                                                                                         |  |      |            |   |      |   |            |  
|Cash flows from financing activities:                                                    |  |      |            |   |      |   |            |  
|Cash distributions to partners                                                           |  |      | (3,069,703 | ) |      |   | (3,980,404 | )
|                                                                                         |  |      |            |   |      |   |            |  
|Net cash used in financing activities                                                    |  |      | (3,069,703 | ) |      |   | (3,980,404 | )
|                                                                                         |  |      |            |   |      |   |            |  
|Net increase (decrease) in cash                                                          |  |      | 4,757      |   |      |   | (3,406     | )
|                                                                                         |  |     
|Cash, beginning of period                                                                |  |      | 1,040      |   |      |   | 3,652      |  
|                                                                                         |  |      |            |   |      |   |            |  
|Cash, end of period                                                                      |  | $    | 5,797      |   |      | $ | 246        |  
|                                                                                         |  |      |            |   |      |   |            |  

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



5



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

CONDENSED STATEMENT OF CHANGES IN PARTNERS CAPITAL

For the nine months ended September 30, 2006

(Unaudited)



|                              |  |                  |            |  
|----------------------------- |  | ---------------- | ---------- | -
|                              |  | PartnersCapital |           
|Balance at December 31, 2005  |  | $                | 14,862,561 |  
|Cash distributions            |  |                  | (3,069,703 | )
|Net loss                      |  |                  | (4,915,547 | )
|                              |  |                  |            |  
|Balance at September 30, 2006 |  | $                | 6,877,311  |  
|                              |  |                  |            |  

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



6



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(Unaudited)

1. Accounting
Policies

Reference is hereby made to the Registrants Annual Report on Form 10-K for 2005, which contains a summary of significant accounting policies
followed by the partnership in the preparation of its financial statements. These policies are also followed in preparing the quarterly report included herein.

In the opinion of management, the accompanying unaudited financial statements contain all adjustments of a normal recurring nature necessary to present fairly our financial position, results of operations, cash flows and partners
capital for the periods presented. The results of operations for the interim periods are not necessarily indicative of the final results expected for the full year.

2. Accounting for Oil and Gas Producing Activities

Mewbourne Energy Partners 03-A, L.P., (the Registrant or the Partnership), a Delaware limited partnership is engaged primarily in oil and gas development and production in Texas, Oklahoma, and New Mexico, and 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 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 the quarter ended March 31, 2005 all general partner interests, other than the managing general partner, were converted to limited partner interests and accordingly all partnership interests have been reflected in the accompanying
financial statements as limited partner interests.

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 September 30, 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 on the sale or other disposition of properties 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 of $6,268,874 for the nine month period ended September 30, 2006. The cost ceiling write-down was principally caused by lower gas prices at September 30, 2006.



7



---

##### Table of Contents

3. Asset Retirement Obligations

In accordance with Financial Accounting Standards Board Statement No. 143, Accounting for Asset Retirement Obligations, the Partnership has recognized an
estimated liability for future plugging and abandonment costs. The estimated liability is based on historical experience and estimated well life. The liability is discounted using the credit-adjusted risk-free rate. Revisions to the liability could
occur due to changes in well plugging and abandonment costs or well useful lives, or if federal or state regulators enact new well restoration requirements. The Partnership recognizes accretion expense in connection with the discounted liability
over the remaining life of the well.

A reconciliation of the Partnerships liability for well plugging and abandonment costs for the nine months
ended September 30, 2006, is as follows:



|                             |  |   |        
|---------------------------- |  | - | -------
|Balance, beginning of period |  | $ | 393,088
|Accretion expense            |  |   | 10,425 
|                             |  |   |        
|Balance, end of period       |  | $ | 403,513
|                             |  |   |        

4. Related Party Transactions

Mewbourne Development Corporation (MD) is managing general partner and 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.
Services and 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.



8



---

##### 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) | As noted above, 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.



9



---

##### Table of Contents

Item 2. Managements Discussion and Analysis of Financial Condition and Results of Operations

Liquidity and Capital Resources

Mewbourne Energy Partners 03-A, L.P. was formed February 19, 2003. The offering of limited and general
partnership interests began May 16, 2003 and concluded July 9, 2003, with total investor contributions of $18,000,000. During the quarter ended March 31, 2005, all general partner interests were converted to limited partner interests
and accordingly all partnership interests have been reflected in the accompanying financial statements as limited partner interests.

The Partnership has
acquired interests in oil and gas prospects for the purpose of development drilling. The Partnership participated in the drilling of 73 wells. 65 wells were productive and 8 wells were abandoned.

Future capital requirements and operations will be conducted with available funds generated from oil and gas activities. No bank borrowing is anticipated. The
Partnership had net working capital of $307,201 at September 30, 2006.

During the nine months ended September 30, 2006, the Partnership made
cash distributions to the investor partners in the amount of $3,069,703 as compared to $3,980,404 for the nine months ended September 30, 2005. The Partnership expects that cash distributions will continue during 2006 as additional oil and gas
revenues are sufficient to produce cash flows from operations.

The sale of crude oil and natural gas produced by the Partnership will be affected by a
number of factors that are beyond the Partnership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 Partnership.



10



---

##### Table of Contents

Results of Operations

Three months ended September 30, 2006 as compared to the three months ended September 30, 2005.

Oil and gas revenues.



|                  |  |                                  |           |      |   |          
|----------------- |  | -------------------------------- | --------- | ---- | - | ---------
|                  |  | Three Months Ended September 30,
|                  |  | 2006                             |           | 2005
|Oil and gas sales |  | $                                | 1,028,999 |      | $ | 1,715,503
|Barrels produced  |  |                                  | 1,615     |      |   | 2,551    
|Mcf produced      |  |                                  | 158,009   |      |   | 201,469  
|Average price/bbl |  | $                                | 67.71     |      | $ | 60.27    
|Average price/mcf |  | $                                | 5.82      |      | $ | 7.75     

As shown in the table above, total oil and gas sales decreased $686,504 (40.0%) for the three months ended
September 30, 2006 as compared to the three months ended September 30, 2005. Of this decrease, $63,381, $252,899 and $389,208, respectively, were related to decreases in volumes of oil sold, volumes of gas sold and decreases in the average
prices of gas sold. Volumes of oil and gas sold decreased 936 bbls of oil and 43,460 mcf of gas for the three months ended September 30, 2006 as compared to the three months ended September 30, 2005. The decrease in volumes of oil sold was
primarily due to a substantial decline in the production of three wells. 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 two wells. The wells
with a substantial decline in production are not expected to return to previous levels of production. Average gas prices decreased to $5.82 per mcf for the three months ended September 30, 2006 from $7.75 per mcf for the three months ended
September 30, 2005. These decreases were partially offset by an increase of $18,984 related to an increase in the average price of oil sold. Average oil prices increased to $67.71 per bbl for the three months ended September 30, 2006 from
$60.27 per bbl for the three months ended September 30, 2005.

Lease operations and production taxes. Lease operating expense during the period ended
September 30, 2006 totaled $114,462 and was comparable to $113,852 for the period ended September 30, 2005. Production taxes during the period ended September 30, 2006 totaled $81,942 as compared to $138,097 for the period ended
September 30, 2005. The decrease in production taxes is due to the decrease in oil and gas revenues.

Depreciation, depletion and amortization.
Depreciation, depletion and amortization for the three month period ended September 30, 2006 total $347,730 compared to $441,502 for the three month period ended September 30, 2005. The decrease is due to the decline in production volumes.

Cost ceiling write-down. There was a cost ceiling write-down of $3,591,998 for the three month period ended September 30, 2006. The cost ceiling
write-down was caused by lower gas prices at September 30, 2006. There was no cost ceiling write-down for the three month period ended September 30, 2005.

Administrative and general expense. Administrative and general expense for the three month period ended September 30, 2006 total $43,471 compared to $57,596 for the period ended September 30, 2005. The
overall decrease is due to reduced administrative charges caused by decreased oil and gas revenues since administrative charges are a percentage of gross revenue.



11



---

##### Table of Contents

Nine months ended September 30, 2006 as compared to the nine months ended
September 30, 2005.

Oil and gas revenues.



|                  |  |                                 |           |      |   |          
|----------------- |  | ------------------------------- | --------- | ---- | - | ---------
|                  |  | Nine months Ended September 30,
|                  |  | 2006                            |           | 2005
|Oil and gas sales |  | $                               | 3,178,710 |      | $ | 4,797,563
|Barrels produced  |  |                                 | 5,154     |      |   | 9,030    
|Mcf produced      |  |                                 | 455,755   |      |   | 667,417  
|Average price/bbl |  | $                               | 65.18     |      | $ | 52.37    
|Average price/mcf |  | $                               | 6.24      |      | $ | 6.48     

As shown in the table above, total oil and gas sales decreased $1,618,853 (33.7%) for the nine months ended
September 30, 2006 as compared to the nine months ended September 30, 2005. Of this decrease, $252,653, $1,321,901 and $159,941, respectively, were related to decreases in volumes of oil sold, volumes of gas sold and decreases in the
average prices of gas sold. Volumes of oil and gas sold decreased 3,876 bbls of oil and 211,662 mcf of gas for the nine months ended September 30, 2006 as compared to the nine months ended September 30, 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. Average gas prices decreased to $6.24 per mcf for the nine months ended September 30, 2006 from $6.48 per mcf for the nine months ended September 30, 2005. These decreases were partially offset by an increase
of $115,642 related to an increase in the average price of oil sold. Average oil prices increased to $65.18 per bbl for the nine months ended September 30, 2006 from $52.37 per bbl for the nine months ended September 30, 2005.

Lease operations and production taxes. Lease operating expense during the period ended September 30, 2006 totaled $334,895 and was comparable to $341,381 for the
period ended September 30, 2005. Production taxes during the period ended September 30, 2006 totaled $245,167 as compared to $376,756 for the period ended September 30, 2005. The decrease in production taxes is due to the decrease in
oil and gas revenues.

Depreciation, depletion and amortization. Depreciation, depletion and amortization for the nine month period ended
September 30, 2006 total $1,039,040 compared to $1,506,676 for the nine month period ended September 30, 2005. The decrease is due to the decline in production volumes.

Cost ceiling write-down. There was a cost ceiling write-down of $6,268,874 for the nine month period ended September 30, 2006. The cost ceiling write-down was caused by lower gas prices at September 30,
2006. There was no cost ceiling write-down for the nine month period ended September 30, 2005.

Administrative and general expense. Administrative and
general expense for the nine month period ended September 30, 2006 total $198,555 compared to $209,795 for the period ended September 30, 2005. The overall decrease is due to reduced administrative charges caused by decreased oil and gas
revenues since administrative charges are a percentage of gross revenue.



12



---

##### Table of Contents

Item 3. Quantitative and Qualitative Disclosures about Market Risk

1. 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.

2. 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 nine months ended September 30, 2006, a 10% change in the price received for natural gas production would have
had an approximate $284,000 impact on our revenue.

3. 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.

Item 4. Disclosure 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 its disclosure controls and procedures are effective as of September 30, 2006 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 MDCs internal controls or in other factors which has materially affected, or is reasonable likely to materially affect the
internal controls over financial reporting.

Part II - Other Information

Item 1. Legal Proceedings

None.



13



---

##### Table of Contents

Item 6. Exhibits and Reports on Form 8-K

(a) Exhibits filed herewith.



|     |  |                                                                            
|---- |  | ---------------------------------------------------------------------------
|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.

(b) Reports on Form 8-K

None.



14



---

##### Table of Contents

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Partnership 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 Corporation
|                        |  |                                      |  | Managing General Partner         
|                        |  |                                     
|Date: November 14, 2006 |  |                                      |  |                                  
|                        |  |                                     
|                        |  | By:                                  |  | /s/ Alan Clark                   
|                        |  |                                      |  | Alan Clark, Treasurer            



15



---

##### Table of Contents

INDEX TO EXHIBITS



|              |  |                                                                            
|------------- |  | ---------------------------------------------------------------------------
|EXHIBITNUMBER |  | DESCRIPTION                                                                
|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.



16