SDR ASAA2016090317895

Service difficulty report · Valve · Boeing 737890

Difficulty date: September 3, 2016
Submitted: September 6, 2016
Operation: Air carrier
Aircraft: N581AS
Make and model: Boeing 737890
Aircraft serial: 35188
Aircraft time: 35,837 hours, 10,839 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Condition: Malfunctioned
Location: Cabin Temp
Part time: 35,832 hours, 10,838 cycles
Stage of operation: CL
How discovered: O
Nature of condition: M
Precautionary procedure: O

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

What was found

DURING LIFTOFF, COCKPIT BECAME VERY WARM. ALSO, NOT THE SAME VOLUME OF AIR COMING OUT OF VENTS. DURING CLIMB, PRESSURIZATION OK. AIR VOLUME CONTROL RETURNED TO NORMAL AND SYSTEM PERFORMED NORMALLY. ACFT GROUNDED. CURRENTLY SYSTEM CHECKS GOOD BUT HAS HISTORY. TEMPERATURE CONTROL VALVE PREVIOUSLY CHANGED. AS PRECAUTIONARY, REMOVED AND REPLACED V143 CONTROL CABIN TRIM VALVE IAW AMM 21-61-21-000-801 AND 21-61-21-400-801, GROUND FUNCTIONAL CHECKED GOOD IAW AMM 21-61-00-700-806-002.