SDR ASAA2016111618710

Service difficulty report · A/C Pack · Boeing 737990ER

Difficulty date: November 16, 2016
Submitted: November 18, 2016
Operation: Air carrier
Aircraft: N433AS
Make and model: Boeing 737990ER
Aircraft serial: 41704
Aircraft time: 12,346 hours, 3,979 cycles
System (JASC): 2150 · Cabin Cooling System
Part: A/C Pack
Condition: Tripped
Location: Left
Stage of operation: CL
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

LEFT PACK TRIPPED IN FLIGHT. PERFORMED QRH WOULD NOT RESET AND PACK LIGHT REMAINED ILLUMINATED. ACFT GROUNDED. CREW REPORTED THAT PACK LIGHT COME ON DURING CLIMBOUT. PERFORMED FIM TASK 21-53 TASK 817. VERIFIED LEFT PACK RAM AIR DUCTS HAS NO BLOCKAGE. LEFT PZTC SHOWS SRADA INLET FAULT ON PREVIOUS FLIGHT. LEFT PZTC BITE VERIFY TESTED NORMAL WITHOUT FAULTS. LEFT PACK OPS CHECKED NORMAL ON GROUND WITHOUT PACK LIGHT ON.