# SDR TRBA20111103

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 2011
- Submitted: July 8, 2011
- Operation: Air carrier
- Aircraft: [N538AT](https://openairdocs.org/aircraft/N538AT), registered now
- Make and model: Aerosp ATR 72-212A
- Registry model: [Aerosp ATR 72-212A](https://openairdocs.org/model/aerospatiale-atr-72-212a) (OpenAirDocs)
- Aircraft serial: 538
- Aircraft time: 21,407 hours, 25,583 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Switch
- Part number: 141FL01D3
- Condition: Inoperative
- Location: Nlg
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TRBA20111103

## Discrepancy

THE CREW REPORTED AT CRUISE AT LEVEL 17000`, THEY DETECTED A THUMPING UNDER THE  PILOTS FEET FOR 20 SECONDS, THEN THE NOSE GEAR UNLOCK LIGHT ON GEAR PANEL NR 1 CAME ON FOR 15 SECONDS THEN ALL SYMPTOMS QUIT.  LIGHT & NOISE RETURNED 1 MORE TIME BRIEFLY.  THE ACFT LANDED WITHOUT INCIDENT.  THE ACFT WAS REMOVED FROM SERVICE.  R & R THE NLG UPLOCK BOX LIMIT SWITCH IAW ATR JIC 32-61-00 RAI 10010. THE OPS CHECK WAS GOOD. THE ACFT WAS RETURNED TO SERVICE.

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