What was found
AIRCRAFT WAS GROUNDED: LEFT FILTER BYPASS LIGHT ILLUMINATED IN FLIGHT DURING CLIMB FROM FL380 TO FL400. INSTALLED ENGINE NUMBER 1 FUEL FILTER DIFFERENTIAL PRESSURE SWITCH. PER AMM 73-34-01, OPS TEST GOOD.
- Difficulty date
- March 6, 2026
- Submitted
- March 10, 2026
- Operation
- Air carrier
- Aircraft
- N934AN
- Make and model
- Boeing 737823
- Aircraft serial
- 29531
- Aircraft time
- 69,618 hours, 29,739 cycles
- Engine
- Cfmint CFM567B242
- System (JASC)
- 7320 · Fuel Controlling System
- Part
- Pressure Switch
- Condition
- Faulty
- Location
- Fuel Sys
- Stage of operation
- CL
- How discovered
- V
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.