# SDR AALA202204044795

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2022
- Submitted: April 4, 2022
- Operation: Air carrier
- Aircraft: [N927AN](https://openairdocs.org/aircraft/N927AN), registered now
- Make and model: Boeing 737
- Aircraft serial: 30077
- Aircraft time: 60,683 hours, 25,115 cycles
- System (JASC): [2700 · Flight Control System](https://openairdocs.org/jasc/2700)
- Part: None
- Part number: 65528202
- Part serial: D01684
- Condition: Faulty
- Location: Zone 100 - Fuse
- Stage of operation: CL
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202204044795

## Discrepancy

AIRCRAFT WAS GROUNDED: MACH TRIM LIGHT ILLUMINATED DURING CLIMB. AIRCRAFT EXCEEDED ALTITUDE WHEN LEVELING. TURNED OFF AUTOPILOT AND HAD A LARGE NOSE DOWN TRIM RECOVERY. FLIGHT DECLARED AN EMERGENCY AND RETURNED TO ORD LANDING SAFELY. ACCOMPLISHED FIM 22-13-00. FOUND INTEGRATED FLIGHT SYSTEMS ACCESSORY UNIT (IFSAU) FAULTY. REPLACED IFSAU PER AMM 22-11-37.

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