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A B747 freighter was dispatched in non compliance with an inoperative autothrottle but deferred incorrectly per the MEL.
| Attributes | |
| ACN | 464981 |
| Time | |
| Date | 200002 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 210 flight time total : 7800 |
| ASRS Report | 464981 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : private pilot : commercial pilot : atp pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 195 flight time total : 16000 flight time type : 405 |
| ASRS Report | 464980 |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper documentation maintenance problem : improper maintenance maintenance problem : non compliance with mel non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : fault isolation performance deficiency : testing |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
We were dispatched on a B747 freighter from nrt (japan) to tpe (taiwan). There was 1 item in the MEL concerning the autothrottle system. Basically the MEL said the system was inoperative, but any part of it that worked could be used. On the flight from nrt-tpe the captain's side of the autothrottle system seemed to work normally. On the return flight (same day, different flight number) we found that the speed selector knob didn't properly set the captain's or the first officer's speed bug. We felt this was in addition to the previous MEL item and wrote it up on arrival in nrt. We later learned that the flight may have been improperly dispatched.
Original NASA ASRS Text
Title: A B747 FREIGHTER WAS DISPATCHED IN NON COMPLIANCE WITH AN INOP AUTOTHROTTLE BUT DEFERRED INCORRECTLY PER THE MEL.
Narrative: WE WERE DISPATCHED ON A B747 FREIGHTER FROM NRT (JAPAN) TO TPE (TAIWAN). THERE WAS 1 ITEM IN THE MEL CONCERNING THE AUTOTHROTTLE SYS. BASICALLY THE MEL SAID THE SYS WAS INOP, BUT ANY PART OF IT THAT WORKED COULD BE USED. ON THE FLT FROM NRT-TPE THE CAPT'S SIDE OF THE AUTOTHROTTLE SYS SEEMED TO WORK NORMALLY. ON THE RETURN FLT (SAME DAY, DIFFERENT FLT NUMBER) WE FOUND THAT THE SPD SELECTOR KNOB DIDN'T PROPERLY SET THE CAPT'S OR THE FO'S SPD BUG. WE FELT THIS WAS IN ADDITION TO THE PREVIOUS MEL ITEM AND WROTE IT UP ON ARR IN NRT. WE LATER LEARNED THAT THE FLT MAY HAVE BEEN IMPROPERLY DISPATCHED.
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.