# SDR ASAA2023042042960

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2023
- Submitted: April 24, 2023
- Operation: Air carrier
- Aircraft: [N477AS](https://openairdocs.org/aircraft/N477AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40716
- Aircraft time: 28,161 hours, 8,724 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- 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/ASAA2023042042960

## Discrepancy

AUTO PILOT "A" DISCONNECTED IN CRUISE FLT, RE-ENGAGED, AFTER 5 MINUTES AUTOPILOT DISCONNECTED, SWITCHED TO AUTO "B" WORKS FINE. GROUNDED - YES. REF B737-900 FIM 22-11 TASK 854 PERFORMED LLM AUTOLAND TEST, ALL TEST PASSED NO FAULTS DETECTED AT THIS TIME. CAT III AUTOLAND AUTHORIZED.

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