SDR ASAA2018040824156

Service difficulty report · Valve · Boeing 737990ER

Difficulty date: April 8, 2018
Submitted: April 10, 2018
Operation: Air carrier
Aircraft: N468AS
Make and model: Boeing 737990ER
Aircraft serial: 41735
Aircraft time: 15,026 hours, 5,026 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Condition: Faulted
Location: Temp System
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

ZONE TEMP LIGHT TURNS ON AFTER DOING A MASTER CAUTION RECALL THE ZONE TEMP LIGHT WILL RESET. GROUNDED - YES. CONFIRMED FAULT. CABIN ZONE TEMP LIGHTS ILLUMINATE DURING MASTER CAUTION RECALL. PERFORMED NR 1 AND NR 2 CABIN TEMP CONTROLLER BITE REF FIM 21-61. NR 1 OPS NORMAL. NR 2 HAS TRIM VALVE FLT DECK FAULT. FAULT CLEARED AFTER RESET. RUN PACKS. NO FAULTS. NO HISTORY IN THE PAST 30 DAYS. THIS CLEARS MEL 21-21F.