# SDR 3EJA202507070001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 30, 2025
- Submitted: July 7, 2025
- Operation: Air carrier
- Aircraft: [N841JS](https://openairdocs.org/aircraft/N841JS), registered now
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5605253
- Aircraft time: 7,660 hours, 6,386 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Condition: Faulted
- Location: Zone 100
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/3EJA202507070001

## Discrepancy

PRIOR TO 80 KNOTS RECEIVED A “ACM O’HEAT” ANNUNCIATION.  PERFORMED VOLTAGE AND CONTINUITY CHECK OF ACM OVERHEAT TEMPERATURE SENSOR (ST012) IAW CE560XL AMM 21-51-00. NO DEFECTS NOTED. PERFORMED VISUAL INSPECTION OF ECU EXHAUST DUST, ACM AND ECU STRUCTURE, AND BLEED AIR TUBING FOR CRACKS AND DEFORMATIONS IAW CE560XL AMM 21-51-00. NO DEFECTS NOTED GAINED ACCESS TO L BLEED AIR OVER HEAT TEMPERATURE SENSOR (ST017), TAIL TEMPERATURE SENSOR (TT0OL),  AND TEMPERATURE SENSOR (ST021) LOCATED ON L BLEED AIR TUBING COMING FROM THE L PRECOOLER IAW
AMM 36-11-01.  PERFORMED OPS CHECK OF PRECOOLER DOOR ACTUATION IAW AMM 36-11-00. NO DEFECTS NOTED.  PERFORMED RESISTANCE CHECK OF SENSOR (TT00L) AND VISUAL EXAMINATIONS OF ALL SENSORS IAW AMM 36-11-01. NO DEFECTS NOTED.  REINSTALLED ALL PANELS REMOVED TO GAIN ACCESS !AW AMM 36-11-01. NO DEFECTS NOTED.  SWAPPED POSITIONS OF LEFT BL-LEVEL FLOW CONTROL VALVE AND RIGHT BL-LEVEL FLOW CONTROL VALVE FOR TROUBLESHOOTING PURPOSES. IAW AMM 21-11-00.  NO DEFECTS NOTED.  EVALUATION FLIGHT REQUIRED TO DETERMINE IF ISSUE REMAINS ON LEFT HAND SIDE OR TRANSITIONS TO RIGHT HAND SIDE.

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