The B737-300 MEL procedure for deferring a thrust reverser requires circuit breakers to be pulled and locked. All breakers labeled per engine except control and indication on P6-2 panel.

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Attributes
ACN	692412
Time
Date	200604
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : san.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 5000
ASRS Report	692412
Person 2
Affiliation	company : air carrier
Function	oversight : coordinator
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Aircraft Chart Or Publication Flight Crew Human Performance Maintenance Human Performance
Primary Problem	Aircraft
Situations
Publication	MEL

Narrative:

Reference engine #1 thrust reverser inoperative. MEL. The procedure requires sync lock; thrust reverser control and indication circuit breakers to be pulled. Engine sync lock circuit breaker is labeled indicating which engine #1 or #2; but cont and ind circuit breakers are not labeled which engine they belong to on the P6-2 panel. If the incorrect circuit breaker was inadvertently pulled; both reversers wouldn't work. After talking with line maintenance we both felt the MEL card should be more descriptive and the P6-2 panel should be placarded to indicate which engine is associated with the cont and ind circuit breakers. I also just talked to maintenance headquarters and he also said this deferral is confusing. Just something to consider from a safety perspective.

Original NASA ASRS Text

Title: THE B737-300 MEL PROC FOR DEFERRING A THRUST REVERSER REQUIRES CIRCUIT BREAKERS TO BE PULLED AND LOCKED. ALL BREAKERS LABELED PER ENG EXCEPT CTL AND INDICATION ON P6-2 PANEL.

Narrative: REF ENG #1 THRUST REVERSER INOP. MEL. THE PROC REQUIRES SYNC LOCK; THRUST REVERSER CONTROL AND INDICATION CIRCUIT BREAKERS TO BE PULLED. ENG SYNC LOCK CIRCUIT BREAKER IS LABELED INDICATING WHICH ENG #1 OR #2; BUT CONT AND IND CIRCUIT BREAKERS ARE NOT LABELED WHICH ENG THEY BELONG TO ON THE P6-2 PANEL. IF THE INCORRECT CIRCUIT BREAKER WAS INADVERTENTLY PULLED; BOTH REVERSERS WOULDN'T WORK. AFTER TALKING WITH LINE MAINT WE BOTH FELT THE MEL CARD SHOULD BE MORE DESCRIPTIVE AND THE P6-2 PANEL SHOULD BE PLACARDED TO INDICATE WHICH ENG IS ASSOCIATED WITH THE CONT AND IND CIRCUIT BREAKERS. I ALSO JUST TALKED TO MAINT HEADQUARTERS AND HE ALSO SAID THIS DEFERRAL IS CONFUSING. JUST SOMETHING TO CONSIDER FROM A SAFETY PERSPECTIVE.

Data retrieved from NASA's ASRS site as of January 2009 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.