Service difficulty report · Circuit Breaker · Boeing 75733N

Difficulty date
September 28, 2024
Submitted
September 30, 2024
Operation
Air carrier
Aircraft
N73860
Make and model
Boeing 75733N
Aircraft serial
32584
Aircraft time
60,927 hours, 17,759 cycles
Part
Circuit Breaker
Part number
B4301
Part serial
CL53816
Condition
Failed
Location
Zone 100
Part time
30,648 hours, 8,476 cycles
Stage of operation
CL
How discovered
O
Nature of condition
G
Precautionary procedure
A

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

What was found

115 VAC BUS L SECT 1 BREAKER FOUND POPPED ON P31 PANEL. AND WDM INFO. SEE WDM 24-51-11-06. DID NOT ATTEMPT RESET REPLACED C901 GCB REF AMM 24-22-03-424-006. INSPECTED #1 FULL LOAD ON LH BUS. NO FAULTS NO MESSAGES. REF WDM 24-21-11 AND FIREWALL CONNECTOR D1016J AND D1116P. NO DEFECTS NOTED. 24-51-11. INSPECTED LUGS ON IDG #1. INSPECTED WIRING TO C313 BUS LEFT RESET BREAKER C313. RAN BOTH ENGINES FOR 10 MIN WITH BREAKER, CIRCUI OFF 99-2422-9-9003 3816 ON 99-2422-9-9003 1012

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