A mechanic reports he inadvertently reinstalled the same APU fuel flow divider; he had just removed ...

Narrative:

I was working a B757-200 and I removed an APU fuel flow divider from the APU; at approx xa:30 local time. Reinstalled the old part on the APU engine in error. Taking the serviceable part in error; as the unserviceable part; and documenting the error on the unserviceable parts tag and log page.this event happened on pad 5 at the hangar. I was the one involved in this incident. The unserviceable parts list shows the serviceable part was never installed on this aircraft. I documented the removal of the unserviceable part the same as the serviceable part serial number.I was working the B757-200 in a very dark lighting; (tail of aircraft). I set down removed old part on the tool storage lid; (normally used for a bench) and removed fittings and o-rings; to install on new part. However; I was complacent and installed fittings and o-rings back on old part. The old removed part was reinstalled; in error.supervisor informed me about this error of part information of an APU fuel flow divider. Going through maintenance parts history; we realized for sure the new part was never installed; and the old part remains installed on the aircraft. The B757-200 was reported by line manager; to be arriving early morning for an outbound flight. Maintenance control notified by supervisor of the situation of the part discrepancy. I would; that I pay better attention in this situation of dim lighting.

Original NASA ASRS Text

Title: A Mechanic reports he inadvertently reinstalled the same APU fuel flow divider; he had just removed from a B757-200 and labeled the new serviceable part as unserviceable. The unserviceable parts list showed the serviceable part was never installed on the aircraft.

Narrative: I was working a B757-200 and I removed an APU fuel flow divider from the APU; at approx XA:30 local time. Reinstalled the old part on the APU engine in error. Taking the serviceable part in error; as the unserviceable part; and documenting the error on the unserviceable parts tag and log page.This event happened on Pad 5 at the hangar. I was the one involved in this incident. The unserviceable parts list shows the serviceable part was never installed on this aircraft. I documented the removal of the unserviceable part the same as the serviceable part serial number.I was working the B757-200 in a very dark lighting; (tail of aircraft). I set down removed old part on the tool storage lid; (normally used for a bench) and removed fittings and O-rings; to install on new part. However; I was complacent and installed fittings and O-rings back on old part. The old removed part was reinstalled; in error.Supervisor informed me about this error of part information of an APU fuel flow divider. Going through maintenance parts history; we realized for sure the new part was never installed; and the old part remains installed on the aircraft. The B757-200 was reported by Line Manager; to be arriving early morning for an outbound flight. Maintenance Control notified by Supervisor of the situation of the part discrepancy. I would; that I pay better attention in this situation of dim lighting.

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.

Attributes
ACN	841991
Time
Date	200906
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	APU Fuel System
Person 1
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural FAR Deviation - Procedural Maintenance

A mechanic reports he inadvertently reinstalled the same APU fuel flow divider; he had just removed from a B757-200 and labeled the new serviceable part as unserviceable. The unserviceable parts list showed the serviceable part was never installed on the aircraft.