Service difficulty report · Overheat Loop · Boeing 777222

Difficulty date
February 7, 2012
Submitted
March 12, 2012
Operation
Air carrier
Aircraft
N215UA
Make and model
Boeing 777222
Aircraft serial
30221
Aircraft time
41,763 hours, 8,979 cycles
Engine
Pwa PW4077
Part
Overheat Loop
Condition
Dirty
Location
L2
Stage of operation
NR
How discovered
O
Nature of condition
N
Precautionary procedure
K

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

What was found

OVERHEAT CIRCUIT LS STATUS MESSAGE. MAINT TEXT: OVERHEAT CIRCUIT L2 STATUS MESSAGE. DEFERRED PER MEL2611K. RANG OUT WIRING, HAND OVER HAND CKS GOOD. INITIAL READINGS FROM CONN D71002P WAS 184 OHMS , SYS "A" WAS 16.3 OHMS. DISCONNECTED ALL LOOPS RANG LOOPS LOOP 26004 4.2OHMS, M26005 5.0OHMS AND LOOP M26006 8OHMS. CLEANED LOOP TERMINALS, ACTIVATED SYS, READINGS AT D71002P 16.2OHMS.