# SDR ASAA2018010223076

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 2, 2018
- Submitted: January 4, 2018
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 19,101 hours, 6,289 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Autothrottle Sys
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018010223076

## Discrepancy

AUTOTHROTTLE KICKED OFF AND WOULD NOT REENGAGE. GROUNDED - YES. RELEASED PER MEL 22-4B AUTOTHROTTLE SYSTEM INOP AND MEL 22-99B CAT III AUTOLAND NOT AUTHORIZED. REF A/T BITE B737-900 FIM 22-31 TASK 801 NO CURRENT FAULTS. LEG 01 SHOWS MESSAGE 22-31688. REF FIM 22-32 TASK 819 A/T SERVO TEST ACCOMPLISHED MULTIPLE TIMES, OPS NORMAL. A/T TORQUE TEST SHOWS NO FAULTS, OPS NORMAL. ACCOMPLISHED DFCS BITE LIBRARY TEST, B737-900 AMM TASK 22-11-00-740-806 (ALL LIBRARY TESTS A+B), FCC INSTALLATION TEST AMM 22-11-33-400-801 SUBTASK 22-11-33-740-801. FCC REPLACEMENT TEST. ALL REQUIRED TESTS PASSED. THIS CLEARS MEL 22-4B, 22-99.

---
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.