# SDR ASAA2015060812026

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2015
- Submitted: June 11, 2015
- Operation: Air carrier
- Aircraft: [N468AS](https://openairdocs.org/aircraft/N468AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41735
- Aircraft time: 3,433 hours, 1,157 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Not Reported
- Condition: Malfunctioned
- Location: Cockpit Temp
- Stage of operation: CL
- 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/ASAA2015060812026

## Discrepancy

SHORTLY AFTER TAKEOFF, THE FLIGHT DECK AIR TEMPERATURE BECAME UNCONTROLLABLE.  BECAME EXTREMELY HOT. SUPPLY DUCT TEMPERATURE IN THE CONTROL CABIN POSITION SHOWED 70 DEG C.   DESPITE TURNING DOWN THE TEMPERATURE CONTROL KNOB IN AUTO AND TURNING IT TO THE OFF POSITION.  THE DUCT TEMPERATURE DID NOT DECREASE. NO CAUTION LIGHTS CAME ON AT ANY TIME.  NO CAUTION LIGHTS CAME ON WITH RECALL, TEMPERATURE CORRECTED ITSELF AFTER 30 MINUTES.  ACFT GROUNDED.  VERIFIED CONT CABIN TEMP SENSOR FILTER IS CLEAN.  ACCOMPLISH PACK/ZONE TEMP.  CONTROLLER BITE TEST, BOTH CONTROLLERS SHOW NO FAULTS.  ACCOMPLISHED CONTROLLER CABIN TEMP CONTROLLER IND, OPS TEST, TEST PASS.  RAN BOTH PACKS FOR 1HR WITH ALL TEMP SELECTORS IN AUTO.  AFTER 1HR TURNED OFF PACKS AND EAC COMP PACK/ZONE TEMP CONT. BITE, STILL NO FAULTS. REF MM 21-61-07-710-013-002 & 21-61-00-700-807-002.

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