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Air carrier medium large transport with engines unable to throttle below high idle has flight crew miscalculate MEL weight for runway length.
| Attributes | |
| ACN | 156665 |
| Time | |
| Date | 199009 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : takeoff ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 50 flight time total : 14000 flight time type : 2000 |
| ASRS Report | 156665 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : far non adherence other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Both engines stuck in high idle mode. Requires weight reduction from runway limited weight. Due to the way this MEL is documented. When departure runway was changed it was necessary to consult 3 different dispatch documents plus 2 manual, (each carried by a different crew member). We thought we had worked it out but during cruise determined that we were overweight for the runway we used. Climb performance would have been ok. The only real problem would have been a V1 engine failure, and no reverse thrust on remaining engine in event of an abort at speed near V1.
Original NASA ASRS Text
Title: ACR MLG WITH ENGINES UNABLE TO THROTTLE BELOW HIGH IDLE HAS FLT CREW MISCALCULATE MEL WEIGHT FOR RWY LENGTH.
Narrative: BOTH ENGS STUCK IN HIGH IDLE MODE. REQUIRES WT REDUCTION FROM RWY LIMITED WT. DUE TO THE WAY THIS MEL IS DOCUMENTED. WHEN DEP RWY WAS CHANGED IT WAS NECESSARY TO CONSULT 3 DIFFERENT DISPATCH DOCUMENTS PLUS 2 MANUAL, (EACH CARRIED BY A DIFFERENT CREW MEMBER). WE THOUGHT WE HAD WORKED IT OUT BUT DURING CRUISE DETERMINED THAT WE WERE OVERWT FOR THE RWY WE USED. CLB PERFORMANCE WOULD HAVE BEEN OK. THE ONLY REAL PROB WOULD HAVE BEEN A V1 ENG FAILURE, AND NO REVERSE THRUST ON REMAINING ENG IN EVENT OF AN ABORT AT SPD NEAR V1.
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.