<< >> NASA ASRS Report 260873, December 1993

Flight crew of an light transport air carrier aircraft inadvertently operated the aircraft in an unairworthy status due to a part replacement.

Attributes
ACN	260873
Time
Date	199312
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : iad
State Reference	VA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 7000
ASRS Report	260873
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I flew an aircraft operated by air carrier X airlines. The flight was from iad to swf without incident. 2 days later I learned that the aircraft may not have been legal to fly. Apparently the aircraft was involved in a part swapping incident with another aircraft which is apparently not legal in this case. The aircraft part that was written up was a yaw-damper. It was interchanged with the other aircraft and worked fine, so it was put back on original aircraft and released for service. I had no knowledge of this until 2 days later.

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Original NASA ASRS Text

Title: FLC OF AN LTT ACR ACFT INADVERTENTLY OPERATED THE ACFT IN AN UNAIRWORTHY STATUS DUE TO A PART REPLACEMENT.

Narrative: I FLEW AN ACFT OPERATED BY ACR X AIRLINES. THE FLT WAS FROM IAD TO SWF WITHOUT INCIDENT. 2 DAYS LATER I LEARNED THAT THE ACFT MAY NOT HAVE BEEN LEGAL TO FLY. APPARENTLY THE ACFT WAS INVOLVED IN A PART SWAPPING INCIDENT WITH ANOTHER ACFT WHICH IS APPARENTLY NOT LEGAL IN THIS CASE. THE ACFT PART THAT WAS WRITTEN UP WAS A YAW-DAMPER. IT WAS INTERCHANGED WITH THE OTHER ACFT AND WORKED FINE, SO IT WAS PUT BACK ON ORIGINAL ACFT AND RELEASED FOR SVC. I HAD NO KNOWLEDGE OF THIS UNTIL 2 DAYS LATER.

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.