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B737-800 captain lost directional control because both engines were not allowed to stabilize at partial power before toga was engaged.
| Attributes | |
| ACN | 550790 |
| Time | |
| Date | 200206 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cvg.airport |
| State Reference | OH |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10700 flight time type : 250 |
| ASRS Report | 550790 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : company policies other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : rejected takeoff flight crew : regained aircraft control |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Takeoff roll. Runway 36R cvg. Power advanced towards takeoff thrust. Autothrottles commanded to engage. Throttles moving towards takeoff power simultaneously. Aircraft veered hard left on takeoff roll from original centerline alignment. Nosewheel steering commanded towards right to counteract aggressive pull towards left. No response from nosewheel steering using tiller. Applied differential braking to correct aircraft back to centerline. Hopping/scraping of nosewheel or dragging of left main brake created burnt rubber smell from skidding tires. Takeoff roll discontinued at 15 KTS. Aircraft within 30 ft from departing prepared surface. Cleared active runway onto first available taxiway. Towed back to gate. Human performance questions: 1) nosewheel steering centered before takeoff roll? Yes, I believe I rolled aircraft forward on takeoff alignment. 2) differential thrust applied on takeoff roll? I don't think so. I did use #2 engine power more during left turn during alignment on position and hold, but I noted both throttles moving forward toward takeoff thrust on initial power-up.
Original NASA ASRS Text
Title: B737-800 CAPT LOST DIRECTIONAL CTL BECAUSE BOTH ENGS WERE NOT ALLOWED TO STABILIZE AT PARTIAL PWR BEFORE TOGA WAS ENGAGED.
Narrative: TKOF ROLL. RWY 36R CVG. PWR ADVANCED TOWARDS TKOF THRUST. AUTOTHROTTLES COMMANDED TO ENGAGE. THROTTLES MOVING TOWARDS TKOF PWR SIMULTANEOUSLY. ACFT VEERED HARD L ON TKOF ROLL FROM ORIGINAL CTRLINE ALIGNMENT. NOSEWHEEL STEERING COMMANDED TOWARDS R TO COUNTERACT AGGRESSIVE PULL TOWARDS L. NO RESPONSE FROM NOSEWHEEL STEERING USING TILLER. APPLIED DIFFERENTIAL BRAKING TO CORRECT ACFT BACK TO CTRLINE. HOPPING/SCRAPING OF NOSEWHEEL OR DRAGGING OF L MAIN BRAKE CREATED BURNT RUBBER SMELL FROM SKIDDING TIRES. TKOF ROLL DISCONTINUED AT 15 KTS. ACFT WITHIN 30 FT FROM DEPARTING PREPARED SURFACE. CLRED ACTIVE RWY ONTO FIRST AVAILABLE TXWY. TOWED BACK TO GATE. HUMAN PERFORMANCE QUESTIONS: 1) NOSEWHEEL STEERING CTRED BEFORE TKOF ROLL? YES, I BELIEVE I ROLLED ACFT FORWARD ON TKOF ALIGNMENT. 2) DIFFERENTIAL THRUST APPLIED ON TKOF ROLL? I DON'T THINK SO. I DID USE #2 ENG PWR MORE DURING L TURN DURING ALIGNMENT ON POS AND HOLD, BUT I NOTED BOTH THROTTLES MOVING FORWARD TOWARD TKOF THRUST ON INITIAL PWR-UP.
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.