Service difficulty report · Control Valve · Boeing 737405

Difficulty date
June 26, 2025
Submitted
March 4, 2026
Operation
Air carrier
Aircraft
N732CK
Make and model
Boeing 737405
Aircraft serial
24271
Aircraft time
70,181 hours, 48,038 cycles
Part
Control Valve
Part number
32895626
Part serial
4229
Condition
Failed
Location
Zone 600
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
B, A

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

What was found

LT & RT BLEED TRIP OFF & CABIN DEPRESSURE, 2ND EVENT BLEED TRIP OFF LIGHT ON RT PACK ILLUM AFTER ROTATION, BLEED TRIP RESET BUTTON RESET BUT BLEED TRIP OFF LIGHT CAME BACK, PERFORMED BLEED AIR CONTROL SYS OPS TEST, ENG IAW AMM 36-11-05. LT OPS CHKD GOOD. RT NR 2 FAILED OPS CHK. BLEED TRIP OFF LIGHT ON RT PACK ILLUM AFTER ROTATION. BLEED TRIP RESET BUTTON SET BUT BLEED TRIP OFF LIGHT CAME BACK. PRSOV LOCKED OUT, . R & R PRSOV IAW AMM 36-11-15, OPS CHKD GOOD, OPS CHK OF BLEED AIR CONTROL SYS IAW AMM 36-11-05, CHKD GOOD. RT BLEED TRIP LIGHT ILLUM AFTER TAKEOFF. R & R 490 F THERMOSTATIC SWITCH IAW AMM 36-11-71, CHKD GOOD IAW AMM 36-11-05, LEAK CHKD GOOD, ENG RUNS IAW AMM 71-00-00. RT BLEED TRIP LIGHT ILLUM AFTER TAKEOFF. R & R RT PRECOOLER CONTROL VALVE IAW AMM 36-12-35, OPS & LEAK CHKD GOOD IAW AMM 36-11-05. ENG RUNS IAW AMM 71-00-00.