# SDR UIEA2026063000559

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 27, 2026
- Submitted: July 1, 2026
- Operation: Air carrier
- Aircraft: [N489MC](https://openairdocs.org/aircraft/N489MC), registered now
- Make and model: Boeing 747412F
- Aircraft serial: 26553
- Aircraft time: 122,342 hours, 21,307 cycles
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Uplock Sensor
- Part number: 834802
- Condition: Out Of Adjust
- Location: Zone 700
- Stage of operation: CL
- 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/UIEA2026063000559

## Discrepancy

GEAR DISAGREE EICAS MESSAGE AFTER GEAR RETRACTION.  R & R BOTH PRIMARY & SECONDARY UPLOCK SENSORS S402 & S1637 IAW AMM 32-61-11. DURING ADJ OF S402, FOUND SENSOR BRACKET TARGET TO BE TWISTED. R & R RT BODY GEAR UPLOCK SENSOR SWING PLATE IAW AMM 20-51-01. PERF GEAR SWING IAW AMM 32-32-00. ALL OPS CHK GOOD AT THIS TIME.

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