# SDR ASAA2019071230023

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 12, 2019
- Submitted: July 16, 2019
- Operation: Air carrier
- Aircraft: [N506AS](https://openairdocs.org/aircraft/N506AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35690
- Aircraft time: 41,787 hours, 12,787 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Unknown
- Condition: Malfunctioned
- Location: Autopilot Sys
- Stage of operation: AP
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019071230023

## Discrepancy

1) A/P ONLY DISCONNECT WITH MOMENTARY (1 SECOND) "VTK" ON CA (A) SIDE2) WAS NOT ABLE TO SEE ANY MESSAGE WITH RECALL3) CA (A SIDE) A/P REENGAGED NORMALLY. GROUNDED - YES. REF FIM 34-61 TASK 801, FMCS BITE SENSORS TESTED NORMAL, INFLT FAULT PAGE SHOWS LEFT FMC FAULT RESET ON FLT LEG 9 ONLY. REF FIM 22-11 TASK 801, DFCS BITE CURRENT STATUS OK W/O FAULTS. FAULT HISTORY SHOWS FAULT MSG CH-A "FMC DATA INV", LRU TESTS OK. DFCS FMC LRU REPLACEMENT TESTED GOOD. CURRENT STATUS NORMAL. ACCOMPLISHED LAND VERIFY BITE GP 49. NO FAULTS NOTED. NO OTHER RECENT HISTORY.

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