Service difficulty report · Valve · Boeing 75733N

Difficulty date
September 7, 2025
Submitted
September 11, 2025
Operation
Air carrier
Aircraft
N77865
Make and model
Boeing 75733N
Aircraft serial
32589
Aircraft time
72,197 hours, 21,416 cycles
Engine
Rroyce RB211535*
Part
Valve
Condition
Malfunctioned
Location
Zone 400
Stage of operation
TO
How discovered
O
Nature of condition
J
Precautionary procedure
C

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

What was found

LEFT ENG HIGH STAGE EICAS C, THE LEFT ENGINE HPSOV IS CLOSED BECAUSE THE HIGH STAGE BLEED PRESSURETOO HIGH. CREW ABORTED TAKEOFF AT APPROX 20KTS. REF MEL 3611P FOR HPSOV DDP ACCOMPLISHED REQUEST MEL ON #1 ENG. MEL HAS BEEN COMPLIED WITH AND VALVE LOCKED OUT. MEL APPROVED. PLACED ON MEL. DDP ACCOMPLISHED, *DM* AMONG THE POSSIBLE CAUSES IN T/S TREE 36-10 TREE 812 IS A A REGULATOR VALVE 19-3611-9-0004 AND A PILOT VALVE 19-3611-9-0001.

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