# SDR UIEA2026062400539

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 25, 2026
- Submitted: June 25, 2026
- Operation: Air carrier
- Aircraft: [N473MC](https://openairdocs.org/aircraft/N473MC), registered now
- Make and model: Boeing 747-45E
- Registry model: [Boeing 747-45E](https://openairdocs.org/model/boeing-747-45e) (OpenAirDocs)
- Aircraft serial: 27174
- Aircraft time: 123,459 hours, 22,312 cycles
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Altimeter
- Part number: LK357
- Part serial: 1395
- Condition: Faulted
- Location: Standby
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2026062400539

## Discrepancy

FOUND INDICATORY ASSY STBY ALTM FUNCTION FAIL IAW AMM 34-13-02-24-19 & AMM 34-13-02-424-020, REV 116. REPLACED STANDBY ALTIMETER AND PFM TEST OF STANDBY ALTIMETER. RESULT WAS SATISFACTORY.

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