# SDR IPXA2017072819868

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2017
- Submitted: July 28, 2017
- Operation: Air carrier
- Aircraft: [N575UP](https://openairdocs.org/aircraft/N575UP), registered now
- Make and model: Boeing 747-44AF
- Registry model: [Boeing 747-44AF](https://openairdocs.org/model/boeing-747-44af) (OpenAirDocs)
- Aircraft serial: 35664
- Aircraft time: 35,494 hours, 5,323 cycles
- System (JASC): [3297 · Landing Gear System Wiring](https://openairdocs.org/jasc/3297)
- Part: Wire
- Condition: Damaged
- Location: Proximity Switch
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2017072819868

## Discrepancy

EICAS AFTER TAKEOFF FOR GEAR DISAGREE, DUMP FUEL, AND RETURNED TO DEPARTURE.  REVIEWED CMC FAULT MESSAGE AND FOUND RT BODY GEAR UP PRI & ALT PROXIMITY SWITCHES FAILED.  PERFORMED TROUBLESHOOTING & INSPECTION OF PRI & ALT SENSORS AND WIRES IAW WDM 32-61-25, FOUND J20, T381 ONE TERMINAL STUD BROKEN. REPAIR AND SPLICE AFFECTED WIRES & CONTINUITY CHECKED OK IAW EOB747-2000-32424-D. R & R PSEU ASSY.

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