Service difficulty report · Bypass Switch · Boeing 7377CT

Difficulty date
September 23, 2025
Submitted
September 24, 2025
Operation
Air carrier
Aircraft
N7821L
Make and model
Boeing 7377CT
Aircraft serial
32748
Aircraft time
70,238 hours, 36,681 cycles
Engine
Cfmint CFM567B242
Part
Bypass Switch
Condition
Faulted
Location
Nr 2 Engine
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
E, A

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

What was found

NR 2 ENGINE OIL FILTER BYPASS LIGHT ILLUMINATED IN FLIGHT. DID NOT EXTINGUISH WITH THRUST LEVER RETARDED TO CLOSED. INSPECTED NR 2 ENG OIL FILTER & FOUND NO PRESCENCE OF CONTAMINANTS; R & R OIL FILTER IAW AMM 79-21-06. LEAK CHECKED GOOD. OK TO CONTINUE PER MEL 79-2-01 SP 1 AUTH 281946. R & R NR 2 ENG OIL FILTER BYPASS SWITCH IAW AMM 79-21-07.

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