EXHIBIT 31.2

CERTIFICATIONS

I, J. Roe Buckley certify that:

1. I have reviewed this annual report on Form 10-K of Mewbourne Energy Partners 09-A, L.P.

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to the period covered by this annual report;

3. Based on my knowledge, the
financial statements, and other financial information included in this annual report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in
this annual report;

4. The registrants other certifying officers and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a) Designed
such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known
to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed
such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the
effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on
such evaluation; and

(d) Disclosed in this report any change in the registrants internal control over financial
reporting that occurred during the registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
registrants internal control over financial reporting; and

5. The registrants other certifying officers and I have disclosed,
based on our most recent evaluation, to the registrants auditors and the audit committee of the registrants board of directors (or persons performing the equivalent function):

(a) all significant deficiencies in the design or operation of internal controls which could adversely affect the registrants
ability to record, process, summarize and report financial data and have identified for the registrants auditors any material weaknesses in internal controls; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control over financial reporting.



|                     |  |  |  |                                           
|-------------------- |  |  |  | ------------------------------------------
|Date: March 31, 2011 |  |  |  | /s/ J. Roe Buckley                        
|                     |  |  |  | J. Roe Buckley                            
|                     |  |  |  | Chairman of the Board                     
|                     |  |  |  | Chief Financial Officer                   
|                     |  |  |  | Mewbourne Development Corporation,        
|                     |  |  |  | Managing General Partner of the Registrant