# SDR UIEA2026071000587

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2026
- Submitted: July 13, 2026
- Operation: Air carrier
- Aircraft: [N475MC](https://openairdocs.org/aircraft/N475MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29252
- Aircraft time: 107,014 hours, 19,772 cycles
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Proximity Sensor
- Condition: Out Of Tolerance
- Location: Zone 700
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2026071000587

## Discrepancy

GEAR DISAGREE MSG, LT WING LANDING GEAR UP PRIMARY AND ALT PROXIMITY SWITCHES TARGET FAILED.  JACKED AIRCRAFT TO CHECK PROX SENSOR RIGGING. FOUND PROX SENSORS S398 & S1638 OUT OF TOLERANCE. RESHIMMED BOTH SWITCHES IAW AMM 32-61-21. OPS CHECKED GOOD.

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