Service difficulty report · Float Switch · Boeing 737823

Difficulty date
June 27, 2025
Submitted
June 30, 2025
Operation
Air carrier
Aircraft
N991NN
Make and model
Boeing 737823
Aircraft serial
31242
Aircraft time
26,008 hours, 11,093 cycles
Part
Float Switch
Condition
Inaccurate
Location
Fuel System
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

AIRCRAFT WAS GROUNDED: ON TAKEOFF, WITH 2200LBS IN CENTER TANK, WE NOTICED THE CENTER FUEL QUANTITY RAPIDLY DECREASING AS WE PASSED BY 7,000FT, CENTER TANK RAPIDLY FELL TO 0.0 LBS INDICATED. WE RECEIVED A FMS MESSAGE 'VERIFY GROSS WEIGHT AND FUEL' - WITH NO WAY TO VERIFY FUEL WAS NOT LEAKING FROM THE RIGHT TANK, WE RETURNED TO MIA. REMOVED AND REPLACED RIGHT WING PROBE E1 (AALA202506302917), PROBE F15R (AALA202506306150), COMPENSATOR (AALA202506307238), AND FLOAT SWITCH (AALA202506304331). PER AMM 28-21-71. ADDITIONALLY, REMOVED AND REPLACED FUEL PROCESSOR (AALA202506304348), PER AMM 28-41-71. ALL TESTS AND OPERATIONAL CHECKS ACCOMPLISHED, PER AMM 28-41-00 AND 28-21-71.