Narrative:

In 3/90 aircraft XXXX had the #2 engine hydromechanical metering unit (hmu) changed for parameter fluctuations. The hmu is rigged on the bench prior to installation on the engine. After installation on the right-hand engine, the runs proved to require further rigging of the hmu. After numerous adjustments and engine runs, the hmu had is final rigging. Operations and leak checked good. I finished the safety wiring of the arm adjustments. I also thought I had cotter pinned the 3 linkages connected to the hmu. I then had the inspector xx inspect my work. I then filled out a non-routine work card abc as compliance of work completed. I then had xy review the paperwork so he could sign off the discrepancy on logbook dgf item G and sign the airworthiness release for item G, since I am not yet authority/authorized to sign a logbook discrepancy. On 4/sun/90 aircraft XXXX landed at lch. Upon landing the aircraft had no beta light or reverse. The aft landed west/O any other incident. Maintenance was dispatched from iah to lch to troubleshoot the discrepancy. Upon inspection of the right-hand engine it was found that the linkage from the hmu to PCU at the hmu was disconnected. It appeared that I had missed the cotter pin at the hmu connection. This unfortunate incident has raised my consciousness to a higher degree for maintenance practices. The counseling any training I have received I feel have ensured that this type of oversight will not occur in the future.

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Original NASA ASRS Text

Title: LTT ENGINE REVERSE THRUST SYSTEM INOPERATIVE AFTER LNDG. MAINTENANCE ERROR.

Narrative: IN 3/90 ACFT XXXX HAD THE #2 ENG HYDROMECHANICAL METERING UNIT (HMU) CHANGED FOR PARAMETER FLUCTUATIONS. THE HMU IS RIGGED ON THE BENCH PRIOR TO INSTALLATION ON THE ENG. AFTER INSTALLATION ON THE RIGHT-HAND ENG, THE RUNS PROVED TO REQUIRE FURTHER RIGGING OF THE HMU. AFTER NUMEROUS ADJUSTMENTS AND ENG RUNS, THE HMU HAD IS FINAL RIGGING. OPS AND LEAK CHKED GOOD. I FINISHED THE SAFETY WIRING OF THE ARM ADJUSTMENTS. I ALSO THOUGHT I HAD COTTER PINNED THE 3 LINKAGES CONNECTED TO THE HMU. I THEN HAD THE INSPECTOR XX INSPECT MY WORK. I THEN FILLED OUT A NON-ROUTINE WORK CARD ABC AS COMPLIANCE OF WORK COMPLETED. I THEN HAD XY REVIEW THE PAPERWORK SO HE COULD SIGN OFF THE DISCREPANCY ON LOGBOOK DGF ITEM G AND SIGN THE AIRWORTHINESS RELEASE FOR ITEM G, SINCE I AM NOT YET AUTH TO SIGN A LOGBOOK DISCREPANCY. ON 4/SUN/90 ACFT XXXX LANDED AT LCH. UPON LNDG THE ACFT HAD NO BETA LIGHT OR REVERSE. THE AFT LANDED W/O ANY OTHER INCIDENT. MAINT WAS DISPATCHED FROM IAH TO LCH TO TROUBLESHOOT THE DISCREPANCY. UPON INSPECTION OF THE RIGHT-HAND ENG IT WAS FOUND THAT THE LINKAGE FROM THE HMU TO PCU AT THE HMU WAS DISCONNECTED. IT APPEARED THAT I HAD MISSED THE COTTER PIN AT THE HMU CONNECTION. THIS UNFORTUNATE INCIDENT HAS RAISED MY CONSCIOUSNESS TO A HIGHER DEG FOR MAINT PRACTICES. THE COUNSELING ANY TRNING I HAVE RECEIVED I FEEL HAVE ENSURED THAT THIS TYPE OF OVERSIGHT WILL NOT OCCUR IN THE FUTURE.

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.