SDR 9512536637

Service difficulty report · Bleed Valve · Boeing 747251B

Difficulty date
August 13, 1995
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N637US
Make and model
Boeing 747251B
Aircraft serial
23548
Engine
Pwa JT9D7R4G2
Part
Bleed Valve
Condition
Malfunctioned
Location
Nr 3 Engine
Component
7371092
Stage of operation
TO
Nature of condition
J, M
Precautionary procedure
C, E

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

What was found

DURING TAKEOFF THE NR 3 ENGINE EXPERIENCED A FIRE WARNING WITH THE NACELLE TEMPERATURES GOING INTO THE RED AND AT 115 KNOTS TAKEOFF WAS ABORTED. THE EGT HAD GONE TO 715 DEGREES FOR 15 SECONDS AND A BORESCOPE INSPECTION WAS PERFORMED. THE HIGH STAGE BLEED VALVE WAS FOUND PARTIALLY OPEN AND WAS LOCKED CLOSED. UNDER INVESTIGATION.