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A B757-200 captain discussed whether his decision to reject a takeoff due to a failed air data computer prior to V1 was appropriate.
| Attributes | |
| ACN | 853398 |
| Time | |
| Date | 200909 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Data Computer |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Experience | Flight Crew Last 90 Days 90 Flight Crew Total 10000 Flight Crew Type 5000 |
| Person 2 | |
| Function | Pilot Flying Captain |
| Experience | Flight Crew Last 90 Days 59 Flight Crew Total 12300 Flight Crew Type 5300 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Captain was flying pilot and set takeoff thrust. I verified takeoff thrust was set and checked engine instruments. All engine instruments were normal. At 80 knots I called '80 knots' and airspeed indicators were crosschecked and normal. Between the 80 knots call and V1 the captain aborted the takeoff and I noted speed; notified the tower and started the clock. The highest speed I noted on the asi was 122 knots. After clearing the runway the captain stated he had lost airspeed; altimeter and vertical speed instruments. While taxiing in the captains instruments remained flagged and a constant overspeed warning was heard. I checked the brake cooling chart for our takeoff weight of 170.0 and we had roughly a 30 minute brake cooling period. Returned to ramp and met with maintenance. The left air data computer computer was replaced and about 1 hour later we blocked out.
Original NASA ASRS Text
Title: A B757-200 Captain discussed whether his decision to reject a takeoff due to a failed ADC prior to V1 was appropriate.
Narrative: Captain was flying pilot and set takeoff thrust. I verified takeoff thrust was set and checked engine instruments. All engine instruments were normal. At 80 knots I called '80 knots' and airspeed indicators were crosschecked and normal. Between the 80 knots call and V1 the Captain aborted the takeoff and I noted speed; notified the Tower and started the clock. The highest speed I noted on the ASI was 122 knots. After clearing the runway the Captain stated he had lost airspeed; altimeter and vertical speed instruments. While taxiing in the Captains instruments remained flagged and a constant overspeed warning was heard. I checked the brake cooling chart for our takeoff weight of 170.0 and we had roughly a 30 minute brake cooling period. Returned to ramp and met with maintenance. The left ADC computer was replaced and about 1 hour later we blocked out.
Data retrieved from NASA's ASRS site as of April 2012 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.