Service difficulty report · Clamp · Boeing 747230B

Difficulty date
April 17, 2005
Submitted
April 18, 2005
Operation
Air carrier
Aircraft
N508MC
Make and model
Boeing 747230B
Aircraft serial
21644
Aircraft time
97,533 hours, 18,077 cycles
Engine
Ge CF650E2
Engine time
43,603 hours, 31,997 cycles
Part
Clamp
Condition
Loose
Location
Nr 2 High Stage
Stage of operation
TO
How discovered
O
Nature of condition
J
Precautionary procedure
E, C

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

What was found

ON TAKEOFF GROUND ROLL & SETTING TAKEOFF THRUST AT 105.4 DEGREES. SET ROLLING APPROXIMATELY 90 KNOTS. NR 2 ENGINE FIRE LIGHT CAME ON, ABORTED TAKEOFF WITH THROTTLES BACK AT IDLE & SHUT DOWN NR 2 ENGINE. BOTH A & B LOOPS READING 8 UNITS. BRAKE TEMPS ALL GREEN. FOUND NR 2 HIGH STAGE VALVE CLAMP LOOSE. RESEATED & RETORQUED CLAMP PER MM 36-11-05. ACCOMPLISHED DUCT LEAK CHECK PER MM 05-51-30, NO LEAKS. ACCOMPLISHED HIGH ENERGY STOP PER 05-51-10.