Service difficulty report · Warning Light · Boeing 777222

Difficulty date
September 28, 2004
Submitted
October 5, 2004
Operation
Air carrier
Aircraft
N783UA
Make and model
Boeing 777222
Aircraft serial
26950
Aircraft time
33,548 hours, 5,141 cycles
Engine
Pwa PW4090
Part
Warning Light
Condition
Illuminated
Location
Bleed System
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

BLEED LOSS WING LEFT AND BLEED LOSS BODY LEFT EICAS MSGS. ALSO HYD PRESS DEMAND CI MSG. FOUND THE LOWER FLOW CONTROL VALVE INSTALLATION CLAMP BROKEN WITH APPRECIABLE BLEED AIR LEAKAGE. FURTHER INVESTIGATION OF THE CLAMP FOUND FAILURE OCCURED AT A SPOT WELD ADJACENT TO THE LOOP THAT SECURES THE TIGHTENING TEE BOLT TO THE CLAMP ASSEMBLY. AS A RESULT, THE CLAMP LOST ALL TENSION. THE CLAMP WAS REPLACED AND LEAK CHECK ACCOMPLISHED.