# SDR ASAA2023102845885

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2023
- Submitted: October 30, 2023
- Operation: Air carrier
- Aircraft: [N968AK](https://openairdocs.org/aircraft/N968AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67420
- Aircraft time: 1,611 hours, 470 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023102845885

## Discrepancy

AT CRUISE, FA REPORTED THAT AFT CABIN WAS TOO HOT. WE TURNED DOWN THE AFT CAB TEMP, BUT THE AFT SUPPLY DUCT TEMP STAYED HIGH-AROUND 32 DEGREES. AFTER SOME TIME, IT DECREASED TO AROUND 28 DEGREES, BUT FA REPORTED AFT CABIN STILL HOT, WE TURNED OFF TRIM AIR PER CHECKLIST, AND AFT SUPPLY DUCT & AFT CABIN COOLED. GROUNDED - YES. FOUND AFT CABIN TEMP SENSOR FILTER CLOGGED WITH OMF MAINTENANCE MESSAGE 21-55341. CLEANED FILTER AND ACCOMPLISHED IFIM 21-51-00-810. OPS TEST NORMAL.

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