SDR SWAA2015081742911

Service difficulty report · Relay · Boeing 7373H4

Difficulty date: August 16, 2015
Submitted: August 17, 2015
Operation: Air carrier
Aircraft: N384SW
Make and model: Boeing 7373H4
Aircraft serial: 26590
Aircraft time: 67,803 hours, 55,345 cycles
System (JASC): 2450 · AC Power Distribution System
Part: Relay
Part number: BACR13CG4
Condition: Faulty
Location: Cockpit
Stage of operation: CL
How discovered: O
Nature of condition: O
Precautionary procedure: A

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

What was found

DIVERSION, CLIMBING THROUGH FL330 TO FL360, NR 1 BUS OFF LIGHT ILLUMINATED. APU STARTED BELOW FL350 & PLACED ONLINE NR 1 SIDE. HOWEVER, POWER WOULD NOT STAY ONLINE WITH EITHER ENG GEN OR APU SELECTED. ON ITS OWN IT CYCLES ON & OFF;. R & R POWER TRANSFER SIGNAL RELAY R349 IAW MM.

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