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Captain of an medium large transport air carrier aircraft lost directional control of the aircraft during the takeoff roll and aborted due to 1 engine slow to 'spool-up' resulting in the aircraft going off the side of the runway.
| Attributes | |
| ACN | 252850 |
| Time | |
| Date | 199309 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : ind |
| 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 other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 10300 flight time type : 3300 |
| ASRS Report | 252850 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 12500 flight time type : 1100 |
| ASRS Report | 252851 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other anomaly other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
On sep/wed/93, flight ab, iah-mco departing at PM30 local in an medium large transport the following took place: we were cleared into position and hold on runway 14L iah. As we were moving into position we received takeoff clearance from tower. On runway heading, throttles were slowly advanced to approximately 35-50 percent N1 both engines. Throttles were then advanced to takeoff power and toga was engaged. #2 engine accelerated to takeoff power rapidly while #1 was extremely slow. Full right rudder and right nosewheel steering was applied. Throttles were retarded to idle, but directional control was impossible to maintain. Left main gear and nose gear departed left side of runway surface. No emergency evacuate/evacuation was initiated. All pertinent procedures and checklist were completed in accordance with air carrier SOP. Should consider a maximum differential N1 limiter automatic retard until directional control can be maintained with the rudder.
Original NASA ASRS Text
Title: CAPT OF AN MLG ACR ACFT LOST DIRECTIONAL CTL OF THE ACFT DURING THE TKOF ROLL AND ABORTED DUE TO 1 ENG SLOW TO 'SPOOL-UP' RESULTING IN THE ACFT GOING OFF THE SIDE OF THE RWY.
Narrative: ON SEP/WED/93, FLT AB, IAH-MCO DEPARTING AT PM30 LCL IN AN MLG THE FOLLOWING TOOK PLACE: WE WERE CLRED INTO POS AND HOLD ON RWY 14L IAH. AS WE WERE MOVING INTO POS WE RECEIVED TKOF CLRNC FROM TWR. ON RWY HDG, THROTTLES WERE SLOWLY ADVANCED TO APPROX 35-50 PERCENT N1 BOTH ENGS. THROTTLES WERE THEN ADVANCED TO TKOF PWR AND TOGA WAS ENGAGED. #2 ENG ACCELERATED TO TKOF PWR RAPIDLY WHILE #1 WAS EXTREMELY SLOW. FULL R RUDDER AND R NOSEWHEEL STEERING WAS APPLIED. THROTTLES WERE RETARDED TO IDLE, BUT DIRECTIONAL CTL WAS IMPOSSIBLE TO MAINTAIN. L MAIN GEAR AND NOSE GEAR DEPARTED L SIDE OF RWY SURFACE. NO EMER EVAC WAS INITIATED. ALL PERTINENT PROCS AND CHKLIST WERE COMPLETED IN ACCORDANCE WITH ACR SOP. SHOULD CONSIDER A MAX DIFFERENTIAL N1 LIMITER AUTO RETARD UNTIL DIRECTIONAL CTL CAN BE MAINTAINED WITH THE RUDDER.
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.