# SDR CALA2022050901169

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 6, 2022
- Submitted: May 9, 2022
- Operation: Air carrier
- Aircraft: [N15751](https://openairdocs.org/aircraft/N15751), registered now
- Make and model: Boeing 737-71Q
- Registry model: [Boeing 737-71Q](https://openairdocs.org/model/boeing-737-71q) (OpenAirDocs)
- Aircraft serial: 29047
- Aircraft time: 69,504 hours, 27,925 cycles
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Shift Mechanism
- Part number: 102AH2AG
- Condition: Failed
- Location: N/A
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2022050901169

## Discrepancy

STAB TRIM LITE ILLUMINATED IN FLIGHT WITH A SPEED TRIM FAILURE BOTH AIRCFAFT HAD TO BE FLOWN BY HAND NO AUTOPILOT PERFORMED STAB TRIM TEST, COLUMN SWITCHING MODULES AND NEUTRAL SHIFT SENSOR FAILED SEVERAL TIMES. FURTHER T/S REQUIRED. REF L/P 8537413, FOUND PHASE B MISSING FROM CB C3001. R&R''D CB C3001, PERF''D DFCS OPS TEST FOR STAB/SPEED TRIM SYS IAW AMM 22-11-00-740-801. ALL TESTS PASS, NO FURTHER DEFECTS NOTED. OK TO CONTINUE.

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