# SDR UIEA2023061600647

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 16, 2023
- Submitted: June 20, 2023
- Operation: Air carrier
- Aircraft: [N416MC](https://openairdocs.org/aircraft/N416MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 32838
- Aircraft time: 88,714 hours, 14,580 cycles
- System (JASC): [2100 · Air Conditioning System](https://openairdocs.org/jasc/2100)
- Part: Shutoff Valve
- Part number: 322684002
- Part serial: 547
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- How discovered: V
- Nature of condition: F, O
- Precautionary procedure: D, O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2023061600647

## Discrepancy

ITEM 1: AIR TURNBACK DUE TO COCKPIT AND UPPER DECK TEMPERATURES CONTINUALLY DROPPING. FLT DECK SET AT 29C, FWD DECK SET AT 15C, UPPER DECK 8C & CREW REST AT 3C.(<P>REMOVED AND REPLACED FWD TRIM AIR SHUTOFF VALVE PER AMM 21-28-04, TEST PASSED.</P>)

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