# SDR AALA20171017006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 17, 2017
- Submitted: October 20, 2017
- Operation: Air carrier
- Aircraft: [N501AA](https://openairdocs.org/aircraft/N501AA), registered now
- Make and model: Doug DC-9-82
- Registry model: [Doug DC-9-82](https://openairdocs.org/model/mcdonnell-douglas-dc-9-82) (OpenAirDocs)
- Aircraft serial: 49738
- Aircraft time: 79,054 hours, 42,153 cycles
- System (JASC): [7830 · Engine Thrust Reverser](https://openairdocs.org/jasc/7830)
- Part: Switch
- Part number: 221EN502R
- Condition: Faulty
- Location: Thrust Reverser
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20171017006

## Discrepancy

LEFT ENGINE THRUST REVERSER UNLOCK INDICATION DURING DESCENT.  EMERGENCY DECLARED.  LANDING UNEVENTFUL.  REMOVED AND REPLACED THRUST REVERSER UPPER LATCH INDICATOR SWITCH S1-450 PER AMM 78-32-02.  OPERATIONAL CHECK GOOD.  AIRCRAFT WAS GROUNDED.

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