Service difficulty report · Circuit Breaker · Boeing 757222

Difficulty date
April 15, 2011
Submitted
May 6, 2011
Operation
Air carrier
Aircraft
N590UA
Make and model
Boeing 757222
Aircraft serial
28708
Aircraft time
53,041 hours, 14,807 cycles
Engine
Pwa PW2037
Part
Circuit Breaker
Condition
Tripped
Location
Cockpit
Stage of operation
NR
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

CREW REPORT MULTIPLE CB POPPED (APPROX 20). CURRENTLY UNABLE TO FAULT SYSTEM. NEEDS TEST FLIGHT DUE TO RECENT FINDING OF NUMEROUS CB'S FOUND POPPED ON P11 AND P6 PANEL. ACCOMPLISH TEST FLT WITH AN EG CREW TO VERIFY NORMAL OPERATION OF ACFT ELECTRICAL SYSTEM OPERATIONS. CREATE CF ITEM REQUESTING EG CREW TO OPERATE ENG GENERATORS ISOLATED AND INDIVIDUALLY POWERED UNDER VARIOUS LOADS AND CHECK NORMAL OPERATION ACFT ELECTRICAL SYS DURING ALL PHASES OF PHASES OF FLIGHT. THIS VERIFICATION FLIGHT CONFIRMS NORMAL OPERATION OF THE SUBJECT SYSTEM(S). TRANSMISSION OF THIS MRM CODE IS CONFIRMATION THAT THE SYSTEM(S) OPERATE NORMALLY. CREW COMMENTS: CF0938. ITEM NOTED WILL REFERENCE WITH CF0938 SIGN OFF.