Service difficulty report · Bypass Valve · Boeing 7378

Difficulty date
October 15, 2023
Submitted
October 18, 2023
Operation
Air carrier
Aircraft
N8734Q
Make and model
Boeing 7378
Aircraft serial
60713
Aircraft time
8,151 hours, 3,725 cycles
Part
Bypass Valve
Part number
NOTREPORTED
Condition
Leaking
Location
Rt Wing
Stage of operation
CR
How discovered
9
Nature of condition
O
Precautionary procedure
K

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

What was found

FUEL VENTING OUT RIGHT WING. 9050 LBS INDICATING IN RIGHT TANK. TURNED OFF R/CTR BOOST PUMP UNTIL FUEL STABILIZED AT 8570. VENTING STOPPPED IMMEDIATELY AFTER R/CTR PUMP WAS TURNED OFF. MAIN/AUX BATTERYS ARE DISCONNECTED FOR TANK DIVE IT IS DUAL MX EV# REQ 2 AMT'S<[01] REMOVED AND REPLACED R/H O/B FUEL BOOST PUMP DISCHARGE BYPASS VALVE; #2 AFT BOOST PUMP CHECK VALVE; AND # 2 FWD BOOST PUMP CHECK VALVE PER WO#2300R905. R&R RT WING FWD BOOST PUMP CK VLV IAW AMM 28-22-71. R&R RIGHT WING AFT BOOST PUMP CK VLV IAW AMM 28-22-71. R&R RIGHT WING O/B BOOST PUMP BYPASS VALVE IAW AMM 28-22- 61. R&R CRACKED TUBE IN RIGHT WING PN 344A2203-602 IAW AMM 28-21-00.

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