# SDR FDEA201203160983

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2012
- Submitted: March 20, 2012
- Operation: Air carrier
- Aircraft: [N598FE](https://openairdocs.org/aircraft/N598FE), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48597
- Aircraft time: 64,243 hours, 11,353 cycles
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Indication Sys
- Condition: False Indication
- Location: Mlg
- Stage of operation: AP
- How discovered: O
- Nature of condition: N
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA201203160983

## Discrepancy

ON APPROACH, LOWERING LANDING GEAR, ALL FOUR GEAR  INDICATED UNSAFE ON BOTH PRIMARY AND SECONDARY  INDICATION SYS.  HYD PRESSURE NORMAL.  NO YAW  DETECTED.  NORMAL SOUND/VIBRATIONS ASSOCIATED WITH GEAR EXTENSION.  EXECUTED MISSED APPROACH. SUBSEQUENT GEAR EXTENSION NORMAL.  SUSPECT GEAR HANDLE NOT  FULLY SEATED, CAUSING UNSAFE INDICATIONS.  IAW FIM 32-30-05-01, PROXIMITY SWITCH UNIT TESTED OK.  GEAR HANDLE SWITCH S1-431 VISUALLY EXAMINED AND APPEARS TO OPERATE NORMALLY. CHECKED RIG OF LANDING GEAR CONTROL VALVE INPUT.  OK IAW AMM 32-31-00-5.  PERFORMED GEAR SWINGS.  CYCLED GEAR THREE TIMES,  ALL OPS & INDICATIONS NORMAL. REF MM 32-31-00-5-0.

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