# SDR CA150603008

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 1, 2015
- Submitted: August 5, 2015
- Operation: General aviation
- Make and model: Dhav DHC8301
- Aircraft time: 58,489 hours
- Engine: Pwa PW123
- Propeller: Hamstd 14SF*
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Housing
- Part number: 82120355009
- Condition: Damaged
- Location: Diverter
- Part time: 59,139 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA150603008

## Discrepancy

(CAN) CABIN DUCT HOT CAUTION LIGHT ILLUMINATED WHILE CLIMBING THROUGH 11,000 FT.  CREW COULD NOT COOL DUCT IN AUTO OR MANUAL MODE, SO FOLLOWED QRH AND SELECTED PACK OFF. DUCT TEMP CAME DOWN GRADUALLY.  ACM MAINTENANCE ACTIONS: RECIRC DIVERTER DUCT HOUSING REPLACED IAW AMM 21-25-06.  GROUND RUNS CARRIED OUT AND ECS FUNCTION CHECK COMPLETED IAW AMM 21-60-01 WITH NO FAULTS FOUND IN AUTO OR MANUAL. TROUBLESHOOTING REVEALED A SHEERED SHAFT IN THE RECIRCULATION DIVERTER VALVE.  RECIRCULATION DIVERTER VALVE REMOVED AS REQUIRED.  RECIRCULATION DIVERTER DUCT HOUSING REPLACED IAW AMM 21-25-06.  GROUND RUNS CARRIED OUT AND ECS SYSTEM FUNCTION CHECKED IAW AMM 21-60-01 WITH NO FAULTS FOUND IN AUTO OR MANUAL.

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