A mechanic working an oil leak on #2 engine on a commercial fixed wing aircraft reports the work job...

Attributes
ACN	376365
Time
Date	199708
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	376365
Person 2
Affiliation	company : air carrier
Function	other personnel other oversight : supervisor
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I was called in by XXX air carrier to inspect an oil leak coming from #2 engine. After inspection I found oil leak was from a banjo fitting on an oil sense line. I received facsimile instruction from XXX on how to replace the sense line. But the problem was that the fitting could not be replaced without taking the entire sense line out. There was no procedure to remove/replace the fitting by itself. So I followed the entire checklist for replacement of oil sense line just to replace the 'O' rings on that banjo fitting. Checklist called for pulling/tagging 4 circuit breakers, including engine ignition circuit breaker on dc transfer bus. After 'O' rings were installed per checklist I tried to motor the engine for leak check but engine would not turn. After discussing the matter with maintenance control, it was determined the checklist was in error in calling for closing the ignition AC circuit breaker prior to motoring engine. Note: checklist called for pulling ignition AC and dc circuit breakers, and in order to start or motor engine ignition dc circuit breaker must be closed prior to engine motoring. Air carrier technician center is in process of correcting this checklist.

Original NASA ASRS Text

Title: A MECH WORKING AN OIL LEAK ON #2 ENG ON A COMMERCIAL FIXED WING ACFT RPTS THE WORK JOB CARD CHKLIST IS IN ERROR.

Narrative: I WAS CALLED IN BY XXX ACR TO INSPECT AN OIL LEAK COMING FROM #2 ENG. AFTER INSPECTION I FOUND OIL LEAK WAS FROM A BANJO FITTING ON AN OIL SENSE LINE. I RECEIVED FAX INSTRUCTION FROM XXX ON HOW TO REPLACE THE SENSE LINE. BUT THE PROB WAS THAT THE FITTING COULD NOT BE REPLACED WITHOUT TAKING THE ENTIRE SENSE LINE OUT. THERE WAS NO PROC TO REMOVE/REPLACE THE FITTING BY ITSELF. SO I FOLLOWED THE ENTIRE CHKLIST FOR REPLACEMENT OF OIL SENSE LINE JUST TO REPLACE THE 'O' RINGS ON THAT BANJO FITTING. CHKLIST CALLED FOR PULLING/TAGGING 4 CIRCUIT BREAKERS, INCLUDING ENG IGNITION CIRCUIT BREAKER ON DC TRANSFER BUS. AFTER 'O' RINGS WERE INSTALLED PER CHKLIST I TRIED TO MOTOR THE ENG FOR LEAK CHK BUT ENG WOULD NOT TURN. AFTER DISCUSSING THE MATTER WITH MAINT CTL, IT WAS DETERMINED THE CHKLIST WAS IN ERROR IN CALLING FOR CLOSING THE IGNITION AC CIRCUIT BREAKER PRIOR TO MOTORING ENG. NOTE: CHKLIST CALLED FOR PULLING IGNITION AC AND DC CIRCUIT BREAKERS, AND IN ORDER TO START OR MOTOR ENG IGNITION DC CIRCUIT BREAKER MUST BE CLOSED PRIOR TO ENG MOTORING. ACR TECHNICIAN CTR IS IN PROCESS OF CORRECTING THIS CHKLIST.

Data retrieved from NASA's ASRS site as of July 2007 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 working an oil leak on #2 engine on a commercial fixed wing aircraft reports the work job card checklist is in error.