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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier flight crew reported diverting after experiencing unreliable airspeed readings during climb.
| Attributes | |
| ACN | 1635900 |
| Time | |
| Date | 201904 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | Large Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Airspeed Indicator |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
We were leaving 29;000 feet for 32;000 feet in IMC conditions. Engine and wing heat was on. We just did a pitot heat check a few minutes prior. As we were climbing we get an overspeed warning with the clacker going off and a hard buffet. I immediately disconnected the autopilot and autothrottle. I lowered the nose and added power. I knew there was no way we were overspeeding at that altitude and climbing. I said 'I'm initiating stall recovery procedures.' as we got through the first stall I went through a secondary stall which I knew was coming. Upon getting through the secondary stall I continued descent and prepared the cabin for emergency landing. I had no reliable airspeed indicator working. Even the standby indicator did not look normal or match the feel of the plane. I immediately asked for a chase plane to help with airspeed. They tried to get [another] flight to me. He could not get to me as I was rapidly descending. At 14;000 feet all three airspeeds came back and paired up. We still did not trust them; but they acted normal. Made an emergency landing; which was uneventful.
Original NASA ASRS Text
Title: Air carrier flight crew reported diverting after experiencing unreliable airspeed readings during climb.
Narrative: We were leaving 29;000 feet for 32;000 feet in IMC conditions. Engine and wing heat was on. We just did a pitot heat check a few minutes prior. As we were climbing we get an overspeed warning with the clacker going off and a hard buffet. I immediately disconnected the autopilot and autothrottle. I lowered the nose and added power. I knew there was no way we were overspeeding at that altitude and climbing. I said 'I'm initiating stall recovery procedures.' As we got through the first stall I went through a secondary stall which I knew was coming. Upon getting through the secondary stall I continued descent and prepared the cabin for emergency landing. I had no reliable airspeed indicator working. Even the standby indicator did not look normal or match the feel of the plane. I immediately asked for a chase plane to help with airspeed. They tried to get [another] flight to me. He could not get to me as I was rapidly descending. At 14;000 feet all three airspeeds came back and paired up. We still did not trust them; but they acted normal. Made an emergency landing; which was uneventful.
Data retrieved from NASA's ASRS site 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.