<< >> NASA ASRS Report 562636, October 2002

A B757-200 with a report of an engine overheat warning, was improperly signed off with a high power run but without a pneumatic duct leak check.

Attributes
ACN	562636
Time
Date	200210
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : lead technician
Qualification	technician : airframe technician : powerplant
ASRS Report	562636
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : #2 eng overheat warning
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : briefing performance deficiency : repair performance deficiency : logbook entry performance deficiency : testing performance deficiency : inspection performance deficiency : fault isolation
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Crew reported, on climb out, right engine overheat EICAS and warning came on. Right bleed switched off, power reduced light went out. Continued with bleed off. I performed right engine high power run for approximately 5 mins at takeoff power. No discrepancies noted with or without engine bleeds. Ok for continued service. After signing the logbook, maintenance control requested the following action: continue T/south of this write-up by a leak check of the pneumatic ducting, control air tubing in the nacelle area of the right engine. The technician that received the turnover from me found a leak on high power 6 duct between hpsov and top of engine. It was in my judgement that the aircraft did not have a leak in the high power ducting because I would have been able to duplicate the fault at the high power engine run. I made the mistake of signing the logbook without performing a routine general visual inspection or performing an idle leak check on the high power ducting.

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Original NASA ASRS Text

Title: A B757-200 WITH A RPT OF AN ENG OVERHEAT WARNING, WAS IMPROPERLY SIGNED OFF WITH A HIGH PWR RUN BUT WITHOUT A PNEUMATIC DUCT LEAK CHK.

Narrative: CREW RPTED, ON CLBOUT, R ENG OVERHEAT EICAS AND WARNING CAME ON. R BLEED SWITCHED OFF, PWR REDUCED LIGHT WENT OUT. CONTINUED WITH BLEED OFF. I PERFORMED R ENG HIGH PWR RUN FOR APPROX 5 MINS AT TKOF PWR. NO DISCREPANCIES NOTED WITH OR WITHOUT ENG BLEEDS. OK FOR CONTINUED SVC. AFTER SIGNING THE LOGBOOK, MAINT CTL REQUESTED THE FOLLOWING ACTION: CONTINUE T/S OF THIS WRITE-UP BY A LEAK CHK OF THE PNEUMATIC DUCTING, CTL AIR TUBING IN THE NACELLE AREA OF THE R ENG. THE TECHNICIAN THAT RECEIVED THE TURNOVER FROM ME FOUND A LEAK ON HIGH PWR 6 DUCT BTWN HPSOV AND TOP OF ENG. IT WAS IN MY JUDGEMENT THAT THE ACFT DID NOT HAVE A LEAK IN THE HIGH PWR DUCTING BECAUSE I WOULD HAVE BEEN ABLE TO DUPLICATE THE FAULT AT THE HIGH PWR ENG RUN. I MADE THE MISTAKE OF SIGNING THE LOGBOOK WITHOUT PERFORMING A ROUTINE GENERAL VISUAL INSPECTION OR PERFORMING AN IDLE LEAK CHK ON THE HIGH PWR DUCTING.

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.