SDR ASAA2019100293868

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: September 30, 2019
Submitted: October 2, 2019
Operation: Air carrier
Aircraft: N433AS
Make and model: Boeing 737990ER
Aircraft serial: 41704
Aircraft time: 23,482 hours, 7,616 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning Light
Condition: False Activation
Location: Lt A/C Pack
Stage of operation: IN
How discovered: V
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

LH PACK LIGHT ILLUMINATES ON RECALL AND EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET. GROUNDED - YES. FOLLOWED B737-900 FIM 21-53 TASK 803. REF W.O 1003123 FOR L/H/R/H HEAT EXCHANGER CLEANING. NO FAULTS FOUND. LH PACK OP CHECK GOOD.