# SDR AALA202207133770

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2022
- Submitted: July 13, 2022
- Operation: Air carrier
- Aircraft: [N833NN](https://openairdocs.org/aircraft/N833NN), registered now
- Make and model: Boeing 737
- Aircraft serial: 31093
- Aircraft time: 35,968 hours, 14,797 cycles
- System (JASC): [3421 · Attitude Gyro and Indicating System](https://openairdocs.org/jasc/3421)
- Part: Air Data Module
- Part number: HG2050AC11
- Condition: None
- Location: Zone 100 - Fuse
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202207133770

## Discrepancy

AIRCRAFT WAS GROUNDED: CAPTAIN AND FIRST OFFICERS AIRSPEED INDICATORS UNRELIABLE/ERRATIC AT FL330. OCCURRED 2 TIMES FOR APPROXIMATELY 5 SECONDS IN DURATION "AIRSPEED LOW" AURAL. WARNING WITH SECOND OCCURRENCE. V NAV DISCONNECTED ALTIMETER FLUCTUATED BY APPROXIMATELY 300 FEET. REPLACED LEFT AIR DATA INERTIAL REFERENCE UNIT PER AMM 34-21-01 ALSO TOTAL AIR TEMPERATURE PROBE (AALA202207132993) PER AMM 34-21-06.

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