Service difficulty report · Relief Valve · Boeing 7472D3B

Difficulty date
March 6, 2004
Submitted
March 9, 2004
Operation
Air carrier
Aircraft
N505MC
Make and model
Boeing 7472D3B
Aircraft serial
21251
Aircraft time
85,924 hours, 18,850 cycles
Engine
Ge CF650E2
Engine time
78,609 hours, 14,239 cycles
Part
Relief Valve
Part number
9788926
Part serial
P490C
Condition
Illuminated
Location
Nr 4 Engine
Stage of operation
CL
How discovered
V
Nature of condition
J
Precautionary procedure
E

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

What was found

AT APPROX 6,000 FT NR 4 ENG LOOP FAULT LT ILLUMINATED NACELLE TEMPS A&B OBSERVED RAPIDLY CLIMBING TO 9. REMOVED AND REPLACED HIGH PRESS VLV, HIGH PRESS BLEED VLV HARNESS. REMOVED AND REPLACED PRESSURE RELIEF VLV. ENG OPS CHECKED GOOD, NO DEFECTS NOTED PER MM 36-11-05 & MM 36-11-03.

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