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First officer misset airspeed bugs (V speeds) for takeoff, on takeoff roll when approaching vr (rotate) speed, first officer started rotation, but captain, seeing the speed was too slow, applied pressure on the yoke to prevent the early rotation. Because the captain didn't verbalize what he was doing, the first officer thought there was a control problem and initiated the abort.
| Attributes | |
| ACN | 322953 |
| Time | |
| Date | 199512 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : geg |
| State Reference | WA |
| 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 | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : takeoff |
| 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 : 15000 flight time type : 10000 |
| ASRS Report | 322953 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 8500 flight time type : 2500 |
| ASRS Report | 323668 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Normal takeoff and acceleration. First officer attempted early rotation of aircraft. Captain resisted yoke movement rotation. First officer felt the resistance and interpreted the condition as a jammed elevator. He called for a takeoff abort. Captain acknowledged the abort call, assumed something serious had been seen or happened that he didn't see and immediately rejected the takeoff well below actual V1. Post abort critique revealed first officer's V1 and vr speeds were misset by 10 KTS slow. This was the reason for the early rotation and exaggerated the urgency of the perceived condition for the first officer. No damage or conflict resulted from the aborted takeoff. Routine delay for brake cooling and maintenance inspections combined for a 2 hour delay total.
Original NASA ASRS Text
Title: FO MISSET AIRSPD BUGS (V SPDS) FOR TKOF, ON TKOF ROLL WHEN APCHING VR (ROTATE) SPD, FO STARTED ROTATION, BUT CAPT, SEEING THE SPD WAS TOO SLOW, APPLIED PRESSURE ON THE YOKE TO PREVENT THE EARLY ROTATION. BECAUSE THE CAPT DIDN'T VERBALIZE WHAT HE WAS DOING, THE FO THOUGHT THERE WAS A CTL PROB AND INITIATED THE ABORT.
Narrative: NORMAL TKOF AND ACCELERATION. FO ATTEMPTED EARLY ROTATION OF ACFT. CAPT RESISTED YOKE MOVEMENT ROTATION. FO FELT THE RESISTANCE AND INTERPRETED THE CONDITION AS A JAMMED ELEVATOR. HE CALLED FOR A TKOF ABORT. CAPT ACKNOWLEDGED THE ABORT CALL, ASSUMED SOMETHING SERIOUS HAD BEEN SEEN OR HAPPENED THAT HE DIDN'T SEE AND IMMEDIATELY REJECTED THE TKOF WELL BELOW ACTUAL V1. POST ABORT CRITIQUE REVEALED FO'S V1 AND VR SPDS WERE MISSET BY 10 KTS SLOW. THIS WAS THE REASON FOR THE EARLY ROTATION AND EXAGGERATED THE URGENCY OF THE PERCEIVED CONDITION FOR THE FO. NO DAMAGE OR CONFLICT RESULTED FROM THE ABORTED TKOF. ROUTINE DELAY FOR BRAKE COOLING AND MAINT INSPECTIONS COMBINED FOR A 2 HR DELAY TOTAL.
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.