# SDR ASAA2018060864960

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2018
- Submitted: June 8, 2018
- Operation: Air carrier
- Aircraft: [N517AS](https://openairdocs.org/aircraft/N517AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35197
- Aircraft time: 36,474 hours, 10,802 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567102
- Part serial: 17YXYK
- Condition: Malfunctioned
- Location: Flight Deck
- Part time: 27,548 hours, 9,709 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018060864960

## Discrepancy

IAS, MACH SPEED SELECTOR WAS FROZEN WITH SPEED AT 157.  ACFT GROUNDED.  PERFORMED FIM 22-32, TASK 803, DFCS BITE SHOWS FAULT 22-4003.  PERFORMED MCP PANEL TEST IAW FIM 22-11, TASK 803 ALL TESTS PASSED.   BUT IAS/MACH KNOB STILL INOPERATIVE.  REMOVED AND REPLACED DFCS MCP IAW AMM 22-11-34, ALL TESTS PASSED, IAS/MACH CONTROL KNOB OPS NORMAL  AIRCRAFT OK FOR SERVICE.

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