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An MD11 was dispatched in non compliance with the #1 FMC deferred as inoperative in conflict with the MEL.
| Attributes | |
| ACN | 599927 |
| Time | |
| Date | 200311 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Weather Elements | Rain |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 120 flight time total : 12000 flight time type : 2700 |
| ASRS Report | 599927 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure non adherence : company policies |
| Independent Detector | other flight crewa |
| 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 |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
| Situations | |
| Publication | Minimum Equipment List |
Narrative:
When reviewing the aircraft's logbook during the preflight stage of an MD11 international passenger flight, the #1 FMC was deferred by company maintenance control on a subsequent flight. When referring to the aircraft's MEL, it was noted that the #1 FMC couldn't be deferred if the aircraft was equipped with 'GPWS envelope modulation features.' since the aircraft's #1 FMC was previously deferred and signed by maintenance control it was assumed that this particular equipment was not installed on the aircraft. It was also assumed that the previous crew had verified this with company maintenance personnel prior to their flight. It was later found that maintenance control was in error and that this aircraft was equipped with this feature and subsequently flown illegally.
Original NASA ASRS Text
Title: AN MD11 WAS DISPATCHED IN NON COMPLIANCE WITH THE #1 FMC DEFERRED AS INOP IN CONFLICT WITH THE MEL.
Narrative: WHEN REVIEWING THE ACFT'S LOGBOOK DURING THE PREFLT STAGE OF AN MD11 INTL PAX FLT, THE #1 FMC WAS DEFERRED BY COMPANY MAINT CTL ON A SUBSEQUENT FLT. WHEN REFERRING TO THE ACFT'S MEL, IT WAS NOTED THAT THE #1 FMC COULDN'T BE DEFERRED IF THE ACFT WAS EQUIPPED WITH 'GPWS ENVELOPE MODULATION FEATURES.' SINCE THE ACFT'S #1 FMC WAS PREVIOUSLY DEFERRED AND SIGNED BY MAINT CTL IT WAS ASSUMED THAT THIS PARTICULAR EQUIP WAS NOT INSTALLED ON THE ACFT. IT WAS ALSO ASSUMED THAT THE PREVIOUS CREW HAD VERIFIED THIS WITH COMPANY MAINT PERSONNEL PRIOR TO THEIR FLT. IT WAS LATER FOUND THAT MAINT CTL WAS IN ERROR AND THAT THIS ACFT WAS EQUIPPED WITH THIS FEATURE AND SUBSEQUENTLY FLOWN ILLEGALLY.
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.