# SDR 2000ZZZX439

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 16, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N135SJ
- Make and model: Urocop EC135P1
- Registry model: [Urocop EC135P1](https://openairdocs.org/model/eurocopter-deutschland-ec135p1) (OpenAirDocs)
- Aircraft serial: EC1350054
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Mixing Valve
- Part number: JBS8803
- Condition: Inoperative
- Location: Heater
- Part time: 599 hours
- Stage of operation: IN
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2000ZZZX439

## Discrepancy

MIXING VALVE INOPERATIVE.  WHEN BLEED AIR HEAT IS 'OFF', CDS DISPLAY CONTAINS BLEED AIR 'ON'.  THIS OCCURS WHILE SELECTING BLEED AIR HEAT SYSTEM.  REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

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