SDR ASAA2017032620271

Service difficulty report · Filter · Boeing 737990ER

Difficulty date: March 26, 2017
Submitted: March 28, 2017
Operation: Air carrier
Aircraft: N471AS
Make and model: Boeing 737990ER
Aircraft serial: 41703
Aircraft time: 9,835 hours, 3,270 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Filter
Part number: 412A160041
Condition: Contaminated
Location: Cabin
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

FWD CAB ZONE TEMP LIGHT ILLUMINATED ON MASTER CAUTION RECALL. EXTINGUISHED WHEN PUSH TO RESET. GROUNDED - YES. ACCOMPLISHED NR 2 PZ CONTROLLER BITE, REF AMM 21-61-00. FOUND FWD CABIN ZONE TEMP LIGHT "ON". CONTROLLER SHOWED ZONE TRIM VALVE FAULT LIGHT ON. AFTER CLEANING FWD CABIN FAN FILTER PERFORMED BITE AGAIN. NO FAULTS LOGGED - ALL CLEARED. ACCOMPLISHED RIGHT PACK OPS TEST, REF AMM 21-00-00. SYSTEM CHECKS NORMAL.