Service difficulty report · Pressure Valve · Boeing 76734AF

Difficulty date
October 17, 2007
Submitted
October 19, 2007
Operation
Air carrier
Aircraft
N329UP
Make and model
Boeing 76734AF
Aircraft serial
27755
Part
Pressure Valve
Condition
Defective
Location
Rt Engine
Stage of operation
CL
How discovered
O
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

INSPECTION TYPE:ETOP DIVERSION - ON CLIMB AT FL 250, HAD A R ENGINE BLEED OVHT EICAS MSG & OVHT ON PANEL, LTV LIST COMPLETE, HAD 10 PSI OF PRESSURE ON R SIDE, R BLEED AIR SWITCH OFF. CYCLED BLEED AIR SWITCH WITH PWR REDUCTION & LIGHT STAYED ON 20 MINS STRAIGHT. BITE MODULE SHOWED PRV FAILED. FOUND PRV DEFECTIVE AND HPSOV BOTH WITH WORN SHAFTS. CHANGED HPSOV AND PRV PER MM 36-11-07-4, 36-11-1-8-4.

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