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A B737-300 was returned to service in non compliance with the incorrect leading edge flap slat indication module installed. Found on preflight.
| Attributes | |
| ACN | 539988 |
| Time | |
| Date | 200203 |
| Day | Tue |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician oversight : supervisor |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 539988 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance maintenance problem : non compliance with mel non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : collared circuit breaker |
| Resolutory Action | other |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : installation performance deficiency : fault isolation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : testing |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Company |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft on MEL for chronic leading edge flap/slat indicator problem. Flap/slat indicator module removed and replaced. Wrong part number unit installed for aircraft effectivity. Not noted during operations check because only ran trailing edge flaps down to 10 degrees, enough to insure full extension of leading edge devices. Also, stall warning asymmetry circuit breaker pulled and collared to C/west MEL, not reset when MEL cleared. Crew noted problems during morning preflight check. As supervisor, I signed off no paperwork, but was actively involved in troubleshooting. I brought wrong part number unit to aircraft, should have double checked effectivity. Also should have doublechked maintenance manual for operations check procedure. Finally, should have told mechanic to check for any MEL special procedures C/west in MEL.
Original NASA ASRS Text
Title: A B737-300 WAS RETURNED TO SVC IN NON COMPLIANCE WITH THE INCORRECT LEADING EDGE FLAP SLAT INDICATION MODULE INSTALLED. FOUND ON PREFLT.
Narrative: ACFT ON MEL FOR CHRONIC LEADING EDGE FLAP/SLAT INDICATOR PROB. FLAP/SLAT INDICATOR MODULE REMOVED AND REPLACED. WRONG PART NUMBER UNIT INSTALLED FOR ACFT EFFECTIVITY. NOT NOTED DURING OPS CHK BECAUSE ONLY RAN TRAILING EDGE FLAPS DOWN TO 10 DEGS, ENOUGH TO INSURE FULL EXTENSION OF LEADING EDGE DEVICES. ALSO, STALL WARNING ASYMMETRY CIRCUIT BREAKER PULLED AND COLLARED TO C/W MEL, NOT RESET WHEN MEL CLRED. CREW NOTED PROBS DURING MORNING PREFLT CHK. AS SUPVR, I SIGNED OFF NO PAPERWORK, BUT WAS ACTIVELY INVOLVED IN TROUBLESHOOTING. I BROUGHT WRONG PART NUMBER UNIT TO ACFT, SHOULD HAVE DOUBLE CHKED EFFECTIVITY. ALSO SHOULD HAVE DOUBLECHKED MAINT MANUAL FOR OPS CHK PROC. FINALLY, SHOULD HAVE TOLD MECH TO CHK FOR ANY MEL SPECIAL PROCS C/W IN MEL.
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.