# SDR ASAA2017052020830

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2017
- Submitted: May 22, 2017
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 36,845 hours, 11,224 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Computer
- Part number: 305RAA1
- Part serial: AS11367
- Condition: Failed
- Location: Autothrottle Sys
- Part time: 3,932 hours, 1,262 cycles
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017052020830

## Discrepancy

WHEN PUSHING TO/GA BUTTON FOR TAKEOFF NR 1 ENGINE THRUST LEVER DOES NOT ADVANCE,  A/T SWITCH DISENGAGES WITH ACCOMPANING RED FLASHING A/T.  NO BINDING OF THRUST LEVERS WHEN MOVED MANUALLY.  ACFT GROUNDED.  A/T SERVO MOTOR TEST FAILED NR 1 ASM MESSAGE 22-31794,  NR 1 THROTTLES DO NOT MOVE.  REMOVED AND REPLACED THE NR 1 ASM IAW AMM 22-31-91, OPS CHECKED NORMAL.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.