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B757 captain experiences altimeter and airspeed anomalies during takeoff after deicing. Takeoff is rejected at 60-70 KTS.
| Attributes | |
| ACN | 930801 |
| Time | |
| Date | 201102 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | Mixed |
| 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 | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 11000 Flight Crew Type 6000 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 75 Flight Crew Total 7650 Flight Crew Type 250 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence |
Narrative:
Takeoff was planned for with light freezing rain. Airplane had been thouroughly deiced with type I and iv. Runway was in good condition. Takeoff was planned for max thrust due to weather. On takeoff roll before 80 KTS was called noticed altimeter wildly spinning; checked airspeed and no airspeed with flags. Initiated rejected takeoff. Did not notice speed because left a/s failure but estimated to be 60-70 KTS. Rejected takeoff was uneventful and cleared runway prior to mid field. Suspected left air data computer failure and decided to return to ramp. I would not be surprised if airspeed was higher than noted as a result of max takeoff power and quick acceleration but feel reject was proper decision. Failure could have been due to deice fluid entering pitot static system but thorough deicing was necessary due to ice on aircraft.
Original NASA ASRS Text
Title: B757 Captain experiences altimeter and airspeed anomalies during takeoff after deicing. Takeoff is rejected at 60-70 KTS.
Narrative: Takeoff was planned for with light freezing rain. Airplane had been thouroughly deiced with type I and IV. Runway was in good condition. Takeoff was planned for max thrust due to weather. On takeoff roll before 80 KTS was called noticed altimeter wildly spinning; checked airspeed and no airspeed with flags. Initiated rejected takeoff. Did not notice speed because left a/s failure but estimated to be 60-70 KTS. RTO was uneventful and cleared runway prior to mid field. Suspected left ADC failure and decided to return to ramp. I would not be surprised if airspeed was higher than noted as a result of max takeoff power and quick acceleration but feel reject was proper decision. Failure could have been due to deice fluid entering pitot static system but thorough deicing was necessary due to ice on aircraft.
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.