# SDR ASAA2016091918072

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 2016
- Submitted: September 21, 2016
- Operation: Air carrier
- Aircraft: [N459AS](https://openairdocs.org/aircraft/N459AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36352
- Aircraft time: 10,108 hours, 3,282 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016091918072

## Discrepancy

BOTH LEFT AND RIGHT AUTOPILOT DISENGAGE SWITCHES WOULD DISENGAGE AUTOPILOT. HOWEVER NEITHER SWITCH WOULD SILENCE HORN. GROUNDED - YES. FOUND C/B AFCS SYS A WARN LIGHT (BAT) OUT. DETERMINED C/B COULD BE RESET IAW AMM 20-60-01. LAND VERIFY PASS GROUP 49, IAW AMM 22-11-00. HGS SYSTEM PASS IAW MMS 34-36-00. ACFT REMAINS CAT IIIA AUTOLAND & HGS. LWMP STATUS PLACARD SCREW AT CAT IIIA AUTOLAND & HGS.

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