Service difficulty report · Fseu · Boeing 7379

Difficulty date
March 29, 2026
Submitted
April 1, 2026
Operation
Air carrier
Aircraft
N27520
Make and model
Boeing 7379
Aircraft serial
64498
Aircraft time
17,977 hours, 5,933 cycles
Part
Fseu
Part number
285A12005
Part serial
F08340
Condition
Faulted
Location
Flap Sys
Part time
17,966 hours, 5,930 cycles
Stage of operation
CL
How discovered
O
Nature of condition
N
Precautionary procedure
A

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

What was found

FMS LIMITING SPEED IN CLIMB AND CRUISE 226/FLAPS IN CLIMB GAVE M AX CAS+MACH IN CRZ CREW DEBRIEF: FMC ACTED AS THOUGH IT SAW FLAPS NOT FULLY UP IN CLEAN CONFIG. IN CLIMB MODE, 226/FLAPS SHOWED. WHEN SET TO CRUISE SETTING AT LOWER THAN FILED ALT. IT SHOWED MAX CAS/MACH RESTRICTION. WHEN TRYING TO CLIMB TO FILED ALTITUDE, 226/FLAPS SHOWED AGAIN. ALL PFD & FLAP INDICATIONS NORMAL & SHOWED FULLY RETRACTED. VERIFIED ALT VMO SWITCH IN EE IS SAFTIED IN THE NORMAL POSITION. PERFORMED LAND VERIFY TEST REF AMM 22-11-00-700-801 ALL TESTS PASSED. PERFORMED FSEU BITE CHECK WITH NO FAULTS REF AMM 27-51-00-740-801. REMOVED AND REPLACED FSEU AS A PRECAUTIONARY IAW AMM 27-51-01. OPS CHECK NORMAL. NO FAULTS FOUND.

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