# SDR ASAA2017111722631

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 17, 2017
- Submitted: November 20, 2017
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 43,874 hours, 12,955 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Autothrottle Sys
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: NR
- 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/ASAA2017111722631

## Discrepancy

AUTO THROTTLE WILL NOT REMAIN ENGAGED DISCONNECTS WHEN RE-ENGAGED. NOTED NR 1 THRUST LEVER MOVES, NR 2 LEVER DOES NOT. THEN DISCONNECT OCCURRED. GROUNDED - YES. PERFORMED AUTOTHROTTLE BITE REF FIM 22-31 TASK 801. FOUND FAULT 22-31688 ASM 2 FAULT ON LEG 8. NO OTHER FAULTS FOUND. PERFORMED AUTOTHROTTLE TESTS PER FIM 22-32 TASK 819. INITIAL EVALUATION. "NUISANCE FAULT" PER ABOVE REF FIM. OPS GOOD NO FAULTS. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL. AIRCRAFT RELEASED FROM MEL 22-4B AND MEL 22-99B.

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