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Air carrier heavy transport takeoff aborted at low speed when uneven engine spool up creates a temporary loss of aircraft control.
| Attributes | |
| ACN | 189117 |
| Time | |
| Date | 199109 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : pdx |
| State Reference | OR |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Heavy Transport, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : takeoff other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 150 |
| ASRS Report | 189117 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : rejected takeoff |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
In position for takeoff power, advanced brake release, aircraft yawed to left due to low power on #1 engine. As #1 engine spooled up, it over-pwred momentarily and aircraft yawed to right. Pilot discontinued takeoff and taxied off runway. Returned to runway and set takeoff power on all engines with brakes set. All engines checked normal, and flight completed with no problems.
Original NASA ASRS Text
Title: ACR HVT TKOF ABORTED AT LOW SPD WHEN UNEVEN ENG SPOOL UP CREATES A TEMPORARY LOSS OF ACFT CTL.
Narrative: IN POS FOR TKOF PWR, ADVANCED BRAKE RELEASE, ACFT YAWED TO L DUE TO LOW PWR ON #1 ENG. AS #1 ENG SPOOLED UP, IT OVER-PWRED MOMENTARILY AND ACFT YAWED TO R. PLT DISCONTINUED TKOF AND TAXIED OFF RWY. RETURNED TO RWY AND SET TKOF PWR ON ALL ENGS WITH BRAKES SET. ALL ENGS CHKED NORMAL, AND FLT COMPLETED WITH NO PROBLEMS.
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.