# SDR TWAA9613702

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 10, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N979Z](https://openairdocs.org/aircraft/N979Z), registered now
- Make and model: Doug DC-9-31
- Registry model: [Doug DC-9-31](https://openairdocs.org/model/douglas-dc-9-31) (OpenAirDocs)
- Aircraft serial: 47343
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Downlock Switch
- Part number: H146
- Condition: Malfunctioned
- Location: Rt Mlg
- Stage of operation: AP
- Nature of condition: P
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TWAA9613702

## Discrepancy

STL - FLT 631 - DURING APPROACH WHEN LANDING GEAR WAS EXTENDED, RIGHT MAIN LANDING GEAR DID NOT INDICATE DOWN AND LOCKED.  CYCLED LANDING GEAR. FOUND RIGHT MAIN LANDING GEAR DOWNLOCK SWITCH, MFG PN H14-6, MALFUNCTIONING.  REPLACED RIGHT MAIN LANDING GEAR DOWNLOCK SWITCH.  LANDING GEAR INDICATION SYSTEM OPERATIONS CHECKED NORMAL.  CHECK C - 10-14-96 - STL.  (X)

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