# SDR ASAA2019021628197

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 16, 2019
- Submitted: February 20, 2019
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 48,043 hours, 14,190 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: AP
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019021628197

## Discrepancy

AT APPROXIMATELY 2000' FEET ON ILS AUTOPILOT "B" DISCONNECTED AND FIRST OFFICER LOST ALL FLIGHT DIRECTOR GUIDANCE. GROUNDED - YES. PERFORMED DFCS BITE PROCEDURE AND FOUND NO FAULTS PER FIM 22-11 TASK 801. PERFORMED FAULT HISTORY CHECK AND FOUND FAULT CODE 22-11428. PERFORMED FIM 22-11 TASK 809 FOUND NO FAULTS. ALSO FOUND FAULT CODE 22-11052. PERFORMED FIM 22-11 TASK 805 AND NO FAULTS FOUND. PERFORMED GOOD BITE LIBRARY TEST GROUP 11 PER AMM 22-11-00-740-801. COULD NOT DUPLICATE PROBLEM.

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