# SDR UIEA2026060100423

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 1, 2026
- Submitted: June 2, 2026
- Operation: Air carrier
- Aircraft: [N486MC](https://openairdocs.org/aircraft/N486MC), registered now
- Make and model: Boeing 747-45EF
- Registry model: [Boeing 747-45EF](https://openairdocs.org/model/boeing-747-45ef) (OpenAirDocs)
- Aircraft serial: 30608
- Aircraft time: 110,467 hours, 19,602 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Relay
- Part number: 91318506
- Part serial: 10178
- Condition: Faulted
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2026060100423

## Discrepancy

EQUIP COOLING CAUTION MSG IN CRUISE.  R & R FLOW REGULATOR VALVE AND OPS CHECK. NO HELP. R & R EXHAUST FAN SENSOR T1592, CONTROL RELAY R7450, DIODE M3287 & OPS CHECK GOOD IAW AMM 21-58-18/401, WDM 21-58-21 & IPC 24-31-03-20.

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