Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 584; Flight Crew Type 17000
Situational Awareness
Aircraft Equipment Problem Less Severe
Aircraft Aircraft Damaged; Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
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.
B737 Captain reported airspeed anomalies during takeoff which resulted in a return to departure airport.