Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
January 5, 2019
Submitted
January 16, 2019
Operation
Air carrier
Aircraft
N433AS
Make and model
Boeing 737990ER
Aircraft serial
41704
Aircraft time
20,658 hours, 6,771 cycles
Part
Control Valve
Part number
3989083
Part serial
5156
Condition
Failed
Location
Ac Bay
Part time
61,988 hours, 23,637 cycles
Stage of operation
NR
How discovered
O
Nature of condition
O
Precautionary procedure
K

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

What was found

RT PACK WONT COOL CABIN - PACK TEMP 96C AND CLIMBING. GROUNDED - YES. PERFORMED BITE TEST REF AMM 21-61-00 FAULTED BOTH TCV AND ZONE TRIM VALVE. REMOVED AND REPLACED TCV REF AMM 21-51-10 AND REMOVED AND REPLACED FWD CABIN TRIM VALVE REF AMM 21-51-04 OPS CHECK AND LEAK CHECK GOOD FOR BOTH. VERIFIED ACM BLADES ARE INTACT REF AMM 21-51-04. THIS CLEARS MEL 21-33E.