Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
May 13, 2019
Submitted
May 15, 2019
Operation
Air carrier
Aircraft
N472AS
Make and model
Boeing 737990ER
Aircraft serial
60580
Aircraft time
16,316 hours, 5,301 cycles
Part
Control Valve
Part number
3989085
Part serial
20222
Condition
Failed
Location
Ac Bay
Part time
20,137 hours, 6,599 cycles
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

LEFT PACK LIGHT ILLUMINATED ON RECALL. GROUNDED - YES. PERFORMED BITE CHECK REF AMM 21-61-00, FOUND FAULTY TCV. REMOVED AND REPLACED TCV REF AMM 21-51-10. OPS CHECK GOOD.