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A fokker 100 was dispatched in non compliance with the left pack deferred as inoperative per the MEL but the special procedures were not accomplished.
| Attributes | |
| ACN | 452373 |
| Time | |
| Date | 199910 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance lead technician : 32 |
| ASRS Report | 452373 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals performance deficiency : installation performance deficiency : repair performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft xyz arrived with pilot item of noisy left pack. Aircraft was moved to hardstand area to repair. 2 mechanics troubleshot and replaced a modulating valve. This did not correct item. Aircraft XXX canceled at gate with an anti-skid problem that was a no-go due to WX. Instead of extending estimated return to service on aircraft xyz, it was decided to place aircraft xyz left air conditioning pack on MEL. The MEL specification procedures were not clear. Aircraft xyz was taken to gate to take place of aircraft XXX. Aircraft xyz returned to field after approximately 45 mins of flight. Pilot complained of noise still coming from left pack even though pack was turned off. It seemed the turbine itself was failing and noise was coming from ram air turning the turbine. After discussion with maintenance control we took aircraft OTS and replaced left air conditioning pack.
Original NASA ASRS Text
Title: A FOKKER 100 WAS DISPATCHED IN NON COMPLIANCE WITH THE L PACK DEFERRED AS INOP PER THE MEL BUT THE SPECIAL PROCS WERE NOT ACCOMPLISHED.
Narrative: ACFT XYZ ARRIVED WITH PLT ITEM OF NOISY L PACK. ACFT WAS MOVED TO HARDSTAND AREA TO REPAIR. 2 MECHS TROUBLESHOT AND REPLACED A MODULATING VALVE. THIS DID NOT CORRECT ITEM. ACFT XXX CANCELED AT GATE WITH AN ANTI-SKID PROB THAT WAS A NO-GO DUE TO WX. INSTEAD OF EXTENDING ESTIMATED RETURN TO SVC ON ACFT XYZ, IT WAS DECIDED TO PLACE ACFT XYZ L AIR CONDITIONING PACK ON MEL. THE MEL SPEC PROCS WERE NOT CLR. ACFT XYZ WAS TAKEN TO GATE TO TAKE PLACE OF ACFT XXX. ACFT XYZ RETURNED TO FIELD AFTER APPROX 45 MINS OF FLT. PLT COMPLAINED OF NOISE STILL COMING FROM L PACK EVEN THOUGH PACK WAS TURNED OFF. IT SEEMED THE TURBINE ITSELF WAS FAILING AND NOISE WAS COMING FROM RAM AIR TURNING THE TURBINE. AFTER DISCUSSION WITH MAINT CTL WE TOOK ACFT OTS AND REPLACED L AIR CONDITIONING PACK.
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.