Service difficulty report · Actuator · Boeing 737990ER

Difficulty date
September 13, 2018
Submitted
September 19, 2018
Operation
Air carrier
Aircraft
N440AS
Make and model
Boeing 737990ER
Aircraft serial
41705
Aircraft time
19,604 hours, 6,522 cycles
Part
Actuator
Part number
676000141
Part serial
676000142480
Condition
Failed
Location
Lt Ram Air
Part time
12,263 hours, 4,125 cycles
Stage of operation
NR
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 LIGHTS ILLUMINATES ON RECALL, RESETS ON MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED LT FWD RAM AIR INLET ACTUATOR REF AMM 21-51-21. OPS CHECK NORMAL. PERFORMED BITE TEST ON LEFT AND RIGHT PACK/ZONE TEMP CONTROLLERS REF AMM 21-61-00-700-806-002. NO FAULTS FOUND. RAN SYSTEM FOR 40 MINUTES ON BOTH HOT AND COLD SETTINGS, NO LIGHTS ILLUMINATED.