A mechanic reports he inadvertently referenced the maintenance procedures for MEL 36-11-07a when MEL...

Attributes
ACN	891978
Time
Date	201006
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Pneumatic Valve/Bleed Valve
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural MEL Deviation - Procedural Published Material / Policy

Narrative:

Inadvertently looked at procedures for MEL 36-11-07-a when MEL 36-11-07-b is what I was clearing condition for. 'A' does not lock hp (high pressure) valve in 'closed' position. Condition 'B' does lock hp valve 'closed;' which led to me allowing an airbus A320 to fly with hp valve locked out (closed).contract maintenance noticed valve in closed position. I was the last one to do maintenance on system I believe this was the aircraft's first flight since maintenance. I did not look close enough at MEL. Contract maintenance unlocked (opened) valve. My supervisor informed me of my mistake and issued me a performance report. My suggestions [would be] to take my time.

Original NASA ASRS Text

Title: A Mechanic reports he inadvertently referenced the Maintenance procedures for MEL 36-11-07a when MEL 36-11-07b was the correct MEL. An A320 departed with the HP (High Pressure) valve in the locked out ('Closed') position.

Narrative: Inadvertently looked at procedures for MEL 36-11-07-a when MEL 36-11-07-b is what I was clearing condition for. 'A' does not lock HP (High Pressure) valve in 'Closed' position. Condition 'B' does lock HP valve 'Closed;' which led to me allowing an Airbus A320 to fly with HP valve locked out (Closed).Contract Maintenance noticed valve in closed position. I was the last one to do Maintenance on system I believe this was the aircraft's first flight since maintenance. I did not look close enough at MEL. Contract Maintenance unlocked (opened) valve. My Supervisor informed me of my mistake and issued me a performance report. My suggestions [would be] to take my time.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A mechanic reports he inadvertently referenced the maintenance procedures for MEL 36-11-07a when MEL 36-11-07b was the correct MEL. An A320 departed with the hp (high pressure) valve in the locked out ('closed') position.