# SDR ASAA2015050311588

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 3, 2015
- Submitted: May 4, 2015
- Operation: Air carrier
- Aircraft: [N413AS](https://openairdocs.org/aircraft/N413AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35205
- Aircraft time: 8,353 hours, 2,683 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Switch
- Part number: 254A115013
- Condition: Malfunctioned
- Location: Throttle Stand
- 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/ASAA2015050311588

## Discrepancy

T/O WARN SYS DOES NOT ACTIVATE UPON ADVANCEMENT OF NR 1 THRUST LEVER- NORMAL OPS W/NR 2 THRUST LEVER- ADDITIONAL INFO; SOMETIMES NR 1 LEVER ACTIVATES T/O WARNING BUT USUALLY NOT.  ACFT GROUNDED.  SUSPECT M1766 LT A/T SWITCH PACK ASSY.  REPLACED LT A/T SWITCHPACK ASSY IAW MM 76-11-07, INSTALLED B/P PN 254A1150-9, S/N AA-079.  RECEIVED IN SERVICEABLE CONDITION W/SERVICEABLE TAG.  GROUND VERIFICATION SUCCESSFUL.  OPS TESTS & PRESSURIZATION GOOD IAW 76-11-07, NO LONGER A BORROWED PART, THIS CLEARS BORROWED PART DEFERRAL.

---
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.