Service difficulty report · Relay · Boeing 727222

Difficulty date
April 7, 2000
Submitted
October 4, 2000
Operation
Air carrier
Aircraft
N7252U
Make and model
Boeing 727222
Aircraft serial
21399
Aircraft time
62,570 hours, 35,567 cycles
Engine
Pwa JT8D15
Part
Relay
Part number
91318506
Condition
Arced
Location
Boost Pump
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

NR 2 TANK LEFT FORWARD, LEFT AFT AND RIGHT FORWARD BOOST PUMP CIRCUIT BREAKERS POPPED AFTER TAKEOFF. ONLY THE RIGHT AFT PUMP WAS STILL WORKING AND THAT FAILED BEFORE LANDING. RETURNED TO MSY. *S/D* MAINTENANCE FOUND SIGNS OF ARCING AT R109 ESS BUS RELAY AND BROKEN WIRE OFF R109. REPLACE BOTH R109 ESS BUS RELAY AND C814 GENERATOR CONTROL BREAKER AS PRECAUTIONARY.