SDR ASAA2015080412723

Service difficulty report · Valve · Boeing 737890

Difficulty date: August 4, 2015
Submitted: August 6, 2015
Operation: Air carrier
Aircraft: N532AS
Make and model: Boeing 737890
Aircraft serial: 36346
Aircraft time: 19,979 hours, 6,017 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Part number: 3989083
Part serial: 13899
Condition: Failed
Location: A/C Bay
Part time: 20,000 hours, 6,021 cycles
Stage of operation: NR
How discovered: 9
Nature of condition: O
Precautionary procedure: O

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

What was found

FLT DECK COOL, UNABLE TO ADD WARM AIR AT FULL WARM. TURNING TRIM AIR OFF GOT INSTANT RESULTS. CABIN WAS NEVER ISSUE. RAN TEMP SUPPLY SWITCHES IN OFF POSITION. ACFT GROUNDED. R & R CONTROL CABIN TRIM AIR VALVE. OPS CK NORMAL, REF MM 21-61-21, 1 TAG INSTALLED & REMOVED. IPC VERIFIED, CLEARS MEL 21-21G, PLACARD CN 0804030, REMOVED.