SDR ASAA2019041078936

Service difficulty report · Warning Light · Boeing 737890

Difficulty date: April 7, 2019
Submitted: April 10, 2019
Operation: Air carrier
Aircraft: N559AS
Make and model: Boeing 737890
Aircraft serial: 35178
Aircraft time: 46,473 hours, 13,826 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning Light
Condition: False Activation
Location: Lt A/C Pack
Stage of operation: CR
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

L "PACK" LIGHT ILLUMINATED DURING RECALL @ CRUISE FL 340. EXTINGUISHED WHEN MASTER CAUTION RESET. PRESSURIZATION, DUCT PRESSURES, FLY DECK & CABIN TEMPS, & PACK TEMPS ALL NORMAL. GROUNDED - YES. REF B737-800 FIM TASK 21-53 TASK 809, PZTC #1 PREV FLT LOGGED RAM AIR ACT FAULT, BOTH PZTC BITE VERIFY TESTED GOOD W/O FAULTS. GVI LEFT AIR RAM INLET, NO OBSTRUCTIONS NOTED. VERIFIED LEFT PACK OPS CHECKED NORMAL ON GND W/O FAULTS.