<< >> NASA ASRS Report 837752, May 2009

A mechanic reports about a series of procedural oversights that resulted in the installation of an unserviceable APU into a B737 aircraft.

Attributes
ACN	837752
Time
Date	200905
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	APU
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

A series of procedural oversights for wrong APU installation. Serviceable tag didn't have stub removed when removed from an aircraft; which would have rendered the APU unserviceable. Several times; tag should have been checked against serial number (south/north) of APU. Outcome was; an unserviceable APU was mistaken for a serviceable unit several times and ended up being installed.

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Original NASA ASRS Text

Title: A Mechanic reports about a series of procedural oversights that resulted in the installation of an unserviceable APU into a B737 aircraft.

Narrative: A series of procedural oversights for wrong APU installation. Serviceable tag didn't have stub removed when removed from an aircraft; which would have rendered the APU unserviceable. Several times; tag should have been checked against serial number (S/N) of APU. Outcome was; an unserviceable APU was mistaken for a serviceable unit several times and ended up being installed.

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.