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A B747 flight crew advanced the throttles to obtain maximum takeoff power when the use of reduced EPR setting was not sufficient on takeoff at llsd.
| Attributes | |
| ACN | 441250 |
| Time | |
| Date | 199906 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : llsd.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer |
| Experience | flight time last 90 days : 148 flight time total : 16478 flight time type : 680 |
| ASRS Report | 441250 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb other other : 1 |
| Resolutory Action | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Cockpit interruptions with ground personnel during crew performance calculations. Slot time was within 10 mins. A lower EPR setting was calculated for a reduced power takeoff than was required. During the takeoff roll, the crew noticed a slower than normal acceleration roll and advanced power to maximum takeoff power. Climb, cruise and landing were uneventful. During the flight, the crew discussed and reworked and found the mistake, and attributed it to pre takeoff interruptions by ground personnel.
Original NASA ASRS Text
Title: A B747 FLC ADVANCED THE THROTTLES TO OBTAIN MAX TKOF PWR WHEN THE USE OF REDUCED EPR SETTING WAS NOT SUFFICIENT ON TKOF AT LLSD.
Narrative: COCKPIT INTERRUPTIONS WITH GND PERSONNEL DURING CREW PERFORMANCE CALCULATIONS. SLOT TIME WAS WITHIN 10 MINS. A LOWER EPR SETTING WAS CALCULATED FOR A REDUCED PWR TKOF THAN WAS REQUIRED. DURING THE TKOF ROLL, THE CREW NOTICED A SLOWER THAN NORMAL ACCELERATION ROLL AND ADVANCED PWR TO MAX TKOF PWR. CLB, CRUISE AND LNDG WERE UNEVENTFUL. DURING THE FLT, THE CREW DISCUSSED AND REWORKED AND FOUND THE MISTAKE, AND ATTRIBUTED IT TO PRE TKOF INTERRUPTIONS BY GND PERSONNEL.
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.