SDR ASAA2022050838252

Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date: May 8, 2022
Submitted: May 11, 2022
Operation: Air carrier
Aircraft: N530AS
Make and model: Boeing 737890
Aircraft serial: 36578
Aircraft time: 42,853 hours, 12,477 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Modulating Valve
Part number: 3989083
Part serial: 13610
Condition: Faulty
Location: Right Ecs Bay
Part time: 42,872 hours, 12,481 cycles
Stage of operation: NR
How discovered: V
Nature of condition: J
Precautionary procedure: K

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

What was found

FWD CAB ZONE TEMP LIGHT ILLUMINATED ,RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. REPLACED FWD PASSENGER COMPARTMENT ZONE TRIM AIR MODULATION VALVE REF B737-800 AMM 21-61-21-400-800 THROUGH SEP 3,G,4. BITE TEST GOOD. CONTINUED THROUGH STEP 5,H,3 IN REF TO AMM 21-61-21-400-801 OPS AND LEAK CK GOOD.