Service difficulty report · Control Unit · Boeing 757222

Difficulty date
May 7, 2008
Submitted
October 20, 2008
Operation
Air carrier
Aircraft
N597UA
Make and model
Boeing 757222
Aircraft serial
28750
Aircraft time
36,839 hours, 10,244 cycles
Engine
Pwa PW2037
Part
Control Unit
Condition
Malfunctioned
Location
Electrical Sys
Stage of operation
CL
How discovered
O
Nature of condition
W
Precautionary procedure
O

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

What was found

LOST GALLEY LOAD SHED ON CLIMBOUT. RELATED TO SDR 2008UALA02620. THIS ISSUE WAS VERY DIFFICULT TO DIAGNOSE AND REQUIRED THREE WEEKS OF CONSTANT TROUBLESHOOTING. AFTER ALL WIRES WERE HAND OVER HAND CHECKED AND FOUND NORMAL, K1 AND K2 RELAYS WERE CHANGED, BUSS TIE BREAKERS WERE ALSO CHANGED - IT WAS FOUND THAT CHANGING THE ELCU WAS THE FINAL FIX.