# SDR IPXA2025112183093

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 21, 2025
- Submitted: November 21, 2025
- Operation: Air carrier
- Aircraft: [N617UP](https://openairdocs.org/aircraft/N617UP), registered now
- Make and model: Boeing 747-8F
- Registry model: [Boeing 747-8F](https://openairdocs.org/model/boeing-747-8f) (OpenAirDocs)
- Aircraft serial: 64263
- Aircraft time: 24,686 hours, 3,645 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Sensor
- Part number: 4590A010001
- Part serial: 01438
- Condition: Inoperative
- Location: Zone 100
- Stage of operation: CR
- 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/IPXA2025112183093

## Discrepancy

ATB,  TEMP ZONE L EICAS MESSAGE DISPLAYED DURING CRUISE. FOLLOWED QRH AND WAS UNABLE TO RESET SYSTEM. RESULTED IN ATB CMC MAINTENANCE MESSAGE 21098, FIM TASK 21-61-00-810-852, REV. 2025/07/15 ACCOMPLISHED, FLIGHT DECK DUCT TEMPERATURE SENSOR T1647 REPLACED, AMM REFERENCE: 21-61-16/401 CONFIG 1, REV NO. / DATE : 48 / 15 JUL 2025, TRIED TO REPLACE THE IASC #1 FOR PRECAUTIONARY REASON, BUT ALL ATTEMPTS OF SOFTWARE INSTALLATION VIA ANSP WHERE NOT WORKING, SYSTEM TESTS PERFORMED TEMPERATURE REGULATION AND DISPLAYED VALUES ARE FINE.

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