Narrative:

I am a pilot. On feb/09 I test flew and ferried (1.4 hours) a bell 206 from ZZZ following a main transmission change. After the flight; I was informed that the transmission installed had not been registered. The aircraft was flown 3 times afterward by other pilots until error was found. Following discovery of the error the aircraft was grounded and new transmission installed.

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Original NASA ASRS Text

Title: After test flying and ferrying a Bell 206-L1 (LongRanger-2) evacuation helicopter; following a main transmission change; pilot is informed the transmission was not registered and the aircraft had flown three more times prior to being grounded.

Narrative: I am a pilot. On Feb/09 I test flew and ferried (1.4 hours) a Bell 206 from ZZZ following a main transmission change. After the flight; I was informed that the transmission installed had not been registered. The aircraft was flown 3 times afterward by other pilots until error was found. Following discovery of the error the aircraft was grounded and new transmission 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.