Service difficulty report · Pressure Switch · Boeing 737823

Difficulty date
September 11, 2025
Submitted
September 16, 2025
Operation
Air carrier
Aircraft
N864NN
Make and model
Boeing 737823
Aircraft serial
31111
Aircraft time
43,703 hours, 18,681 cycles
Part
Pressure Switch
Part number
ASP4560
Condition
Faulted
Location
Lt Boost Pump
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

AIRCRAFT WAS NOT GROUNDED: LEFT AFTER FUEL PUMP LIGHT WILL ILLUMINATE IN TEST, BUT LIGHT DOES NOT COME ON WHEN BOOST PUMP IS TURNED OFF. CONFIRMED INTERMITTENT INDICATION OF LOW-PRESSURE LIGHT WHEN AFT LEFT FUEL BOOST PUMP SWITCHED TO OFF. REMOVED AND REPLACED AFT LEFT FUEL BOOST PUMP PRESSURE SWTICH. PER AMM 28-42-11. PERFORMED OPERATIONAWL CHECK. OPERATIONAL CHECK GOOD.