SDR MTNA20160422001

Service difficulty report · Control Valve · Aerosp ATR72212

Difficulty date: April 20, 2016
Submitted: April 22, 2016
Operation: Air carrier
Aircraft: N812FX
Make and model: Aerosp ATR72212
Aircraft serial: 404
Aircraft time: 29,389 hours, 28,499 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Control Valve
Part number: 9799901
Part serial: 1083
Condition: Faulty
Part time: 6,360 hours, 4,524 cycles
Stage of operation: CR
How discovered: O
Nature of condition: O
Precautionary procedure: B, I, A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING CRUISE AT FL 190, HOT AIR STARTED COMING OUT OF DUCTS & TEMP CONTINUES TO GET HOTTER, TEMP ABOVE 100 DEGREES. TEMP SWITCHED TO MANUAL MODE & NOTHING CHANGED, RAN THE CHECKLIST, DECLARED AN EMER & RETURNED TO FIELD. R & R NR 1 TEMPERATURE CONTROL VALVE IAW MM JIC 21-61-51 RAI 10000. OPS AND LEAK CHECK GOOD IAW MM JIC 72-00-00.

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