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B737 captain reported airspeed anomalies during takeoff which resulted in a return to departure airport.
| Attributes | |
| ACN | 1683964 |
| Time | |
| Date | 201909 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Angle of Attack Vane |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 584 Flight Crew Type 17000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
The takeoff in ZZZ was uneventful until just past 80 kts. IAS (indicated air speed) disagree flag appeared on both adis (attitude director indicator). I noted about 5-10 kts. Difference and continued takeoff. We continued climb normally but noted captain and first officer (first officer) airspeed and altitude readouts diverging with captain's matching the standby instruments. ATC was notified and we got vectors back to ZZZ while running the airspeed unreliable checklist. Dispatch; [operations] and maintenance were notified. We landed uneventfully and maintenance informed us the problem was a broken first officer aoa (angle of attack) vane. Maintenance stated that they get cracked by ladder stands and fail during takeoff sometimes. A spare aircraft was provided and we continued to ZZZ1. I was surprised that pitot-static instruments were effected by an aoa problem. First officer did nice job flying the aircraft. I would like to know more about the aoa system and how it drives altitude and airspeed displays.
Original NASA ASRS Text
Title: B737 Captain reported airspeed anomalies during takeoff which resulted in a return to departure airport.
Narrative: The takeoff in ZZZ was uneventful until just past 80 kts. IAS (Indicated Air Speed) Disagree flag appeared on both ADIs (Attitude Director Indicator). I noted about 5-10 kts. difference and continued takeoff. We continued climb normally but noted Captain and FO (First Officer) airspeed and altitude readouts diverging with Captain's matching the Standby Instruments. ATC was notified and we got vectors back to ZZZ while running the Airspeed Unreliable Checklist. Dispatch; [Operations] and Maintenance were notified. We landed uneventfully and Maintenance informed us the problem was a broken FO AOA (Angle Of Attack) vane. Maintenance stated that they get cracked by ladder stands and fail during takeoff sometimes. A spare aircraft was provided and we continued to ZZZ1. I was surprised that pitot-static instruments were effected by an AOA problem. FO did nice job flying the aircraft. I would like to know more about the AOA system and how it drives altitude and airspeed displays.
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.