# SDR UIEA2026010600004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 6, 2026
- Submitted: January 7, 2026
- Operation: Air carrier
- Aircraft: [N851GT](https://openairdocs.org/aircraft/N851GT), registered now
- Make and model: Boeing 747-87UF
- Registry model: [Boeing 747-87UF](https://openairdocs.org/model/boeing-747-87uf) (OpenAirDocs)
- Aircraft serial: 37565
- Aircraft time: 58,352 hours, 9,069 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Valve
- Part number: 4528A010001
- Part serial: 452800153
- Condition: Defective
- Location: Cockpit Air
- 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/UIEA2026010600004

## Discrepancy

CABIN TEMP EXCESSIVE (38C)  FOUND MAINT MSG 21304, FLIGHT DECK TRIM AIR VALVE DEFECTIVE. R & R F/D TRIM AIR VALVE AND OPS CHECK OK IAW AMM 21-61-10-401, AIPC 21-61-10-08 & FIM TASK 21-61-01-810-819.

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