Service difficulty report · Modulating Valve · Boeing 737900ER

Difficulty date
June 2, 2023
Submitted
June 6, 2023
Operation
Air carrier
Aircraft
N408AS
Make and model
Boeing 737900ER
Aircraft serial
41732
Aircraft time
38,487 hours, 12,176 cycles
Part
Modulating Valve
Part number
3989083
Part serial
2591
Condition
Faulted
Location
Rt A/C Bay
Part time
86,188 hours, 45,114 cycles
Stage of operation
TX
How discovered
V
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

RT PACK LIGHT ILLUM AFTER ENG START ON MASTER CAUTION RECALL. LIGHT EXTINGUISHED ON RESET. GROUNDED - YES. DURING INITIAL EVALUATION PERFORMED PACK TEMP CONTROLLER 1 & 2 BITE IAW FIM 21-62 TASK 801, RAM AIR ACTUATOR FAULT LIGHT ILLUMINATED ON RT TEMP CONTROLLER, LT TEMP CONTROLLER CHKD GOOD. PERFORMED RAM AIR DOOR ACT OPS TEST, IAW AMM 21-51-00-730-802, OPS TEST GOOD. REF FIM 21-53 TASK 821 & FIM 21-62 TASK 836, #2 PZTC BITE TEST GOOD. VERIFIED FLAP SWITCH S1051 FOR RAM AIR SYS OK. FAN BYPASS CHKD VALVE OPS CHKD OK. GVI HEAT EXCHANGERS OK. VERIFIED RT PACK ACM MOVED FREELY. R & R RT PACK TCV V141 IAW AMM 21-51-10/401 & 2 PZTC IAW AMM 21-61-20/401. RT PZTC BITE TEST GOOD & RT PACK OPS CHKD NORMAL ON GND.

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