Service difficulty report · Isolation Valve · Boeing 74744AF

Difficulty date
June 13, 2021
Submitted
June 21, 2021
Operation
Air carrier
Aircraft
N572UP
Make and model
Boeing 74744AF
Aircraft serial
35669
Aircraft time
50,127 hours, 7,732 cycles
Part
Isolation Valve
Condition
Faulted
Location
Equp Cooling
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

NO EMERG DECL'D - NO EQUIP USED - LANDED UNEVENTFULLY, DUE TO EQUIP COOLING EICAS. PER MEL 36-11-4.L/H ISOLATION VALVE FAILED IN FLIGHT WILL BE SECURED OPEN.DMP PROCEEDURES PER MEL 36-11-4 COMPLIED WITH.DMI NO.M747173 PLACARD UINSTALED.CREW REPORTED VALVE L/H ISLN HAD TO BE SELECTED OFF IN FLT.REVERSED DMP 36-11-4. R/R'D LEFT WING ISOLATION VALVE PER MM 36-11-07-404-015. NO LEAKS NOTED OPS CHECKED GOOD. M747173 CLOSED. ESR IPC 36-11-57-01 S400.

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