<< >> NASA ASRS Report 1290815, August 2015

A large hot air duct leak was discovered on an MEL'd APU during an oil servicing that was not previously detected by the nearby fire loop.

Attributes
ACN	1290815
Time
Date	201508
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	APU
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 196.43 Flight Crew Total 28000 Flight Crew Type 1196.57
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

This APU was deferred due to a large hot air leak in the APU exhaust duct. The leak was only found because the APU needed oil; and the leak was found while adding oil. There is a fire loop here that apparently never detected the leak. This duct leak was not new. It looks like it had been there for at least weeks; perhaps months?

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Original NASA ASRS Text

Title: A large hot air duct leak was discovered on an MEL'd APU during an oil servicing that was not previously detected by the nearby fire loop.

Narrative: This APU was deferred due to a large hot air leak in the APU exhaust duct. The leak was only found because the APU needed oil; and the leak was found while adding oil. There is a fire loop here that apparently never detected the leak. This duct leak was NOT new. It looks like it had been there for at least weeks; perhaps months?

Data retrieved from NASA's ASRS site 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.