Narrative:

Air carrier aircraft ZZZ arrived airport gate yy apr/xa/97 a few mins before XA00 with a first officer's airspeed bug discrepancy and requiring a daily check. When the check was complete, a review of the aircraft log revealed a history of first officer airspeed problems and the instrument was replaced apr/xb/97. A phone call was placed to avionics tech desk, a decision was made to change the flight control computer 'B', but the computer (parts) showed the flight control computer part number in transit. A call was made to stores who confirmed part number was not on shelf. 10 mins later, stores called, flight control computer was found. I replaced the flight control computer 'B' in the aircraft, performed bite through the FMC for 'a' and 'B' and then 'B' channel alone -- all passed. I did not remove aircraft ZZZ from CAT IIIA status as required by air carrier procedures manual. Aircraft then departed for a non maintenance destination in XXX, the flew to ZZZ, a maintenance station where it was removed from CAT IIIA status. I discovered my discrepancy apr/xc/97 while checking the maintenance computers aircraft ZZZ history of airspeed write-ups. I then called the avionic tech desk about the CAT IIIA discrepancy.

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Original NASA ASRS Text

Title: A B737-300 WAS RETURNED TO SVC IN AUTOLAND STATUS AFTER AUTOPLT WORK WAS ACCOMPLISHED WITH INCOMPLETE OPERATIONAL TESTING.

Narrative: ACR ACFT ZZZ ARRIVED ARPT GATE YY APR/XA/97 A FEW MINS BEFORE XA00 WITH A FO'S AIRSPD BUG DISCREPANCY AND REQUIRING A DAILY CHK. WHEN THE CHK WAS COMPLETE, A REVIEW OF THE ACFT LOG REVEALED A HISTORY OF FO AIRSPD PROBS AND THE INST WAS REPLACED APR/XB/97. A PHONE CALL WAS PLACED TO AVIONICS TECH DESK, A DECISION WAS MADE TO CHANGE THE FLT CTL COMPUTER 'B', BUT THE COMPUTER (PARTS) SHOWED THE FLT CTL COMPUTER PART NUMBER IN TRANSIT. A CALL WAS MADE TO STORES WHO CONFIRMED PART NUMBER WAS NOT ON SHELF. 10 MINS LATER, STORES CALLED, FLT CTL COMPUTER WAS FOUND. I REPLACED THE FLT CTL COMPUTER 'B' IN THE ACFT, PERFORMED BITE THROUGH THE FMC FOR 'A' AND 'B' AND THEN 'B' CHANNEL ALONE -- ALL PASSED. I DID NOT REMOVE ACFT ZZZ FROM CAT IIIA STATUS AS REQUIRED BY ACR PROCS MANUAL. ACFT THEN DEPARTED FOR A NON MAINT DEST IN XXX, THE FLEW TO ZZZ, A MAINT STATION WHERE IT WAS REMOVED FROM CAT IIIA STATUS. I DISCOVERED MY DISCREPANCY APR/XC/97 WHILE CHKING THE MAINT COMPUTERS ACFT ZZZ HISTORY OF AIRSPD WRITE-UPS. I THEN CALLED THE AVIONIC TECH DESK ABOUT THE CAT IIIA DISCREPANCY.

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.