# SDR ASAA2022061838751

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 18, 2022
- Submitted: June 23, 2022
- Operation: Air carrier
- Aircraft: [N928AK](https://openairdocs.org/aircraft/N928AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44099
- Aircraft time: 1,085 hours, 322 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Actuator
- Part number: 2A7220A
- Condition: Faulty
- Location: Apu Compartment
- Part time: 1,105 hours, 327 cycles
- Stage of operation: TX
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022061838751

## Discrepancy

MACH TRIM FAIL UPON RECALL DURING AFTER START CHECK. GROUNDED - YES. PERFORMED B737-9 IFIM 22-11-00-810-074, FOUND FAULT CODE 22-11191, 22-11276 AND 22-11202. FOUND FAULT CODE 22-11336 ON CHANNEL B. CYCLED AIRCRAFT POWER, FAULTS RETURNED BOTH A AND B CHANNELS. FLIGHT HISTORY LOGS MULTIPLES MACH TRIM ACTUATOR FAULTS. REMOVED AND REPLACED MT ACTUATOR IN REF TO B737-9 AMM 22-11-24. MT ACTUATOR MULTIFUNCTION TEST PASSED.

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