Service difficulty report · Pressure Switch · Boeing 757222

Difficulty date
June 17, 2011
Submitted
June 22, 2011
Operation
Air carrier
Aircraft
N546UA
Make and model
Boeing 757222
Aircraft serial
25367
Aircraft time
73,372 hours, 21,368 cycles
Engine
Pwa PW2037
Part
Pressure Switch
Condition
Faulted
Location
Center Tank
Stage of operation
IN
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

DURING DEFUELING OF CENTER TANK FROM 11.4 BOTH CENTER TANK PUMPS SHUTOFF AT 8.5 LBS OF FUEL. CYCLED PUMP SWITCHES, NO HELP. SUSPECT AUTO SHUTOFF SYSTEM FAULT. PERFORMED TEST PER MM. SUSPECT RIGHT OVERRIDE BOOST PUMP PRESSURE SWITCH S10011. REPLACED RIGHT CTR PUMP PRESSURE SWITCH. LEAK AND OPS CHECKED NORMAL.