SDR ASAA2016010314622

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: January 3, 2016
Submitted: January 5, 2016
Operation: Air carrier
Aircraft: N431AS
Make and model: Boeing 737990ER
Aircraft serial: 43255
Aircraft time: 8,629 hours, 2,833 cycles
System (JASC): 2150 · Cabin Cooling System
Part: Warning Light
Condition: False Activation
Location: Rt 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

RT PACK CAUTION LIGHT ILLUMINATED DURING CRUISE. 32,000 AND 40 PSI DUCT PRESSURE, RT PACK CAUTION DID NOT EXTINGUISH AFTER SYSTEM RESET. ACFT GROUNDED. PERFORMED FIM TASK 21-62, TASK 854, STEP E. MAINTENANCE MESSAGE SHOWN FOR RAM AIR EXIT. EXAMINED RAM AIR EXIT ACTUATORS, 28 VOLTS DC BETWEEN PINS 4 & 16, GREEN N2 LRU FAULT ON. PERFORMED REPAIR CONFIRMATION PER STEP 6 AND NO FAULTS NOTED. PERFORMED AMM TASK 21-51-00-730-801 AND NO FAULTS NOTED. PACK OPERATES NORMALLY WITH NO FAULTS NOTED.