# SDR CA160304003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 2, 2016
- Submitted: April 22, 2016
- Operation: General aviation
- Make and model: Boeing 737-400
- Registry model: [Boeing 737-400](https://openairdocs.org/model/boeing-737-400) (OpenAirDocs)
- Aircraft time: 45,131 hours
- Engine: Cfmint CFM563C1
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Switch
- Part number: 426EN108
- Condition: Failed
- Location: Autopilot Sys
- Stage of operation: AP
- How discovered: O
- Nature of condition: G
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA160304003

## Discrepancy

(CAN) ON APPROACH, WHEN CREW SELECTED FLAPS TO BE EXTENDED BOTH AUTOPILOT SYS, A  AND B DISCONNECT. ACFT IS OPERATING UNDER MEL WITH TROUBLESHOOTING UNDERWAY BY MAINTENANCE PERSONNEL.  MORE DETAILS TO FOLLOW WHEN TROUBLESHOOTING IS COMPLETE. UPDATE INFO: MAINTENANCE PERSONNEL CARRIED OUT TROUBLESHOOTING OF AUTOPILOT SYS AND AUTOPILOT FOUND FLAP SWITCH, PN 426EN10-8 TO BE AT FAULT.  THE FLAP SWITCH WAS REPLACED IAW AMM 22-11-36 AND NO FURTHER FAULTS WERE NOTED.

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