SDR CALA2026020313530

Service difficulty report · Pressure Switch · Boeing 737924ER

Difficulty date: January 30, 2026
Submitted: February 3, 2026
Operation: Air carrier
Aircraft: N37474
Make and model: Boeing 737924ER
Aircraft serial: 31648
Aircraft time: 40,942 hours, 14,790 cycles
Engine: Cfmint CFM567B27E
System (JASC): 7334 · Fuel Pressure Sensor
Part: Pressure Switch
Part number: APS73B18BARD
Part serial: 84441252
Condition: Faulted
Location: Nr 1 Eng Fuel
Part time: 11,289 hours, 4,350 cycles
Stage of operation: CR
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

LEFT FUEL FILTER BYPASS LIGHT ILLUMINATED. PERFORMED T/S IAW FIM 73-05 TASK 801, FOUND NR 1 ENG FUEL FILTER DIFFERENTIAL PRESSURE SWITCH (FFDPS) DEFECTIVE (INTERNAL SHORT), R & R THE NR 1 ENG FFDPS IAW AMM 73-43-01, REPLACED NR 1 ENG FUEL FILTER IAW AMM 73-11-02, AS A PRECAUTION, OPS & LEAK CHKD NORMAL, IAW AMM 71-00-00.