Narrative:

Events to the best of my knowledge: aircraft X arrived on ferry flight. Aircraft ferried with open maintenance item X. Captain's airspeed indicator reads 60 KTS not moving; aircraft copilot's was 90 KTS and increasing. Aircraft also required daily check; had additional write-up on left wing navigation light and what was thought to be damage by jetway. Operations wanted aircraft turned in approximately 30 mins. In the rush of things; I installed wrong air data computer. Wrong effectivity; should have been Y. Although wrong effectivity installed; a complete check was accomplished in accordance with amm with no faults indicated. Part was subsequently changed with correct one. Aircraft records/quality assurance discovered. I should not have felt pressure to get aircraft out. Had I slowed down and took time to verify part number; this could have been avoided. Also; I was multi-tasking; had more than 1 thing at a time on my mind; with the additional work on aircraft.

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Original NASA ASRS Text

Title: MECHANIC DESCRIBES HOW HIS EFFORTS TO MEET A TURN AROUND DEPARTURE SCHEDULE CONTRIBUTED TO HIS INSTALLING THE WRONG AIR DATA COMPUTER (ADC); EVEN THOUGH THE AMM TEST PROCEDURE PASSED ON A B757-200 ACFT.

Narrative: EVENTS TO THE BEST OF MY KNOWLEDGE: ACFT X ARRIVED ON FERRY FLT. ACFT FERRIED WITH OPEN MAINT ITEM X. CAPT'S AIRSPD INDICATOR READS 60 KTS NOT MOVING; ACFT COPLT'S WAS 90 KTS AND INCREASING. ACFT ALSO REQUIRED DAILY CHK; HAD ADDITIONAL WRITE-UP ON L WING NAV LIGHT AND WHAT WAS THOUGHT TO BE DAMAGE BY JETWAY. OPS WANTED ACFT TURNED IN APPROX 30 MINS. IN THE RUSH OF THINGS; I INSTALLED WRONG ADC. WRONG EFFECTIVITY; SHOULD HAVE BEEN Y. ALTHOUGH WRONG EFFECTIVITY INSTALLED; A COMPLETE CHK WAS ACCOMPLISHED IN ACCORDANCE WITH AMM WITH NO FAULTS INDICATED. PART WAS SUBSEQUENTLY CHANGED WITH CORRECT ONE. ACFT RECORDS/QUALITY ASSURANCE DISCOVERED. I SHOULD NOT HAVE FELT PRESSURE TO GET ACFT OUT. HAD I SLOWED DOWN AND TOOK TIME TO VERIFY PART NUMBER; THIS COULD HAVE BEEN AVOIDED. ALSO; I WAS MULTI-TASKING; HAD MORE THAN 1 THING AT A TIME ON MY MIND; WITH THE ADDITIONAL WORK ON ACFT.

Data retrieved from NASA's ASRS site as of May 2009 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.