# SDR AALA202105289002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 27, 2021
- Submitted: May 28, 2021
- Operation: Air carrier
- Aircraft: [N837NN](https://openairdocs.org/aircraft/N837NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30908
- Aircraft time: 33,127 hours, 13,530 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Module
- Condition: Fluctuates
- Location: Captain'S Adc
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202105289002

## Discrepancy

AIRCRAFT WAS GROUNDED: PASSING FL200 VNAV DISCONNECTED ON CAPTAINÏ¿½S SIDE. AIRSPEED FLUCTUATED. PFD FLAG IN VIEW. RETURNED TO ORD. REPLACED FIRST OFFICER'S PITOT AIR DATA MODULE PER AMM 37-21-04.

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