Service difficulty report · Pressure Switch · Boeing 75733N

Difficulty date
March 18, 2025
Submitted
March 20, 2025
Operation
Air carrier
Aircraft
N57870
Make and model
Boeing 75733N
Aircraft serial
33525
Aircraft time
58,616 hours, 17,154 cycles
Part
Pressure Switch
Part number
7G1105
Condition
Faulted
Location
Zone 100
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

CENTER RIGHT PUMP PRESS LIGHT ILLUMINATED AT FL230 AND SAME EIC AS MESSAGE PERFORMED FIM 28-22 TASK 804. BITE UFI FAULT CODE "A" FLASHING (UNDER FREQUENTCY). RESET UFI NO HELP. REPLACED FUEL BOOST PUMP PRESSURE SWITCH REF AMM 28-42-01. UFI SHOWS ALL 3 LIGHTS FLASHING, RESET NO HELP. FOUND R OVRD FUEL BOOST PUMP CONT RELAY ADD EMP:U220508 POPPED. RESET RELAY. PUMP AND PRESSURE RUNS NORMAL. OPS CHECK OK. PARTS USED: 19-2842-3-0002,QTY :1 40-0608-3-0135,QTY :1

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