SDR ASAA2019021628190

Service difficulty report · Warning System · Boeing 737990ER

Difficulty date: February 16, 2019
Submitted: February 20, 2019
Operation: Air carrier
Aircraft: N492AS
Make and model: Boeing 737990ER
Aircraft serial: 44110
Aircraft time: 12,925 hours, 4,329 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: TX
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

AFTER START ON RECALL GOT RIGHT PACK LIGHT. RAN CHECKLIST, LIGHT EXTINGUISHED, BUT COMES ON WITH RECALL EVERY TIME. EXTINGUISHED ON RESET. GROUNDED - YES. ACCOMPLISHED PZTC NR 1 & NR 2 BITE TEST REF AMM 21-61-00-700-806-002. NO FAULT NOTED ON PZTC NR 1, TCV FAULTED ON PZTC NR 2, RESET PZTC NR 2, PERFORMED BOTH PACKS OPS TEST AMM 21-00-00, NO FAULT ON PZTC NR 1 & NR 2 & RECALL TEST.