# SDR ASAA2021101036275

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 10, 2021
- Submitted: October 19, 2021
- Operation: Air carrier
- Aircraft: [N433AS](https://openairdocs.org/aircraft/N433AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41704
- Aircraft time: 29,850 hours, 9,502 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567102
- Part serial: 16GVMV
- Condition: Faulted
- Location: Cockpit
- Part time: 48,126 hours, 17,970 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021101036275

## Discrepancy

AUTOPILOT "A" WILL NOT ENGAGE. GROUNDED - YES. PERFORMED B737-900 FIM 22-11 TASK 801 TEST GROUP 10.  FAULT MESSAGE 22-11254 DISPLAYED. REMOVED AND REPLACED DFCS MODE CONTROL PANEL REF B737-900 AMM 22-11-34. ACCOMPLISHED LRU REPLACEMENT TEST FOR MCP (BITE TEST GROUP #32) REF AMM 22-11-34. ALL TEST PASS. ACCOMPLISHED LAND VERIFY TEST REF AMM 22-11-00. ALL TEST PASS.

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