SDR ASAA2022030637638

Service difficulty report · Pressure Switch · Boeing 737890

Difficulty date: March 6, 2022
Submitted: March 9, 2022
Operation: Air carrier
Aircraft: N559AS
Make and model: Boeing 737890
Aircraft serial: 35178
Aircraft time: 55,189 hours, 16,200 cycles
System (JASC): 2840 · Fuel Indicating System
Part: Pressure Switch
Part number: 21C1321
Condition: Faulty
Location: L Wing Rear Spar
Stage of operation: IN
How discovered: V
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 PREFLIGHT CHECK, LEFT AFT FUEL PUMP LIGHT ILLUMINATED DIMLY. WHEN TURNED OFF, ILLUMINATED BRIGHT. GROUNDED - YES. REF B737-800 FIM 28-22 TASK 803 STEP H BOOST PUMP DOES NOT OPERATE, UPON REMOVING CONNECTOR D868 LOW PRESSURE LIGHT EXTINGUISHED. REMOVED & REPLACED LEFT AFT BOOST PUMP PRESSURE SWITCH REF B737-800 AMM 28-42-11, LEAK CHECK GOOD, OPS CHECK GOOD REF AMM 28-42-11.