Service difficulty report · Signal Cond Unit · Boeing 74747UF

Difficulty date
May 4, 2026
Submitted
May 7, 2026
Operation
Air carrier
Aircraft
N416MC
Make and model
Boeing 74747UF
Aircraft serial
32838
Aircraft time
100,144 hours, 16,419 cycles
Engine
Ge CF680C2B5F
Part
Signal Cond Unit
Part number
6672M805
Part serial
DE93
Condition
Faulted
Location
Nr 1 Engine
Stage of operation
TO
How discovered
O
Nature of condition
R
Precautionary procedure
C

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

What was found

HIGH SPEED RTO AT 140KTS INDICATED DUE TO ENG NR 1 NOT MAKING T/O THRUST. R & R N1 FAN SHAFT SPEED SENSOR & ENG IDLE RUN CHKD OK IAW AMM 77-12-01/401, AMM 71-00-00/501 & IPC 77-12-01-01. NEED THE ENG HIGH PWR CHK. R & R AVM SIGNAL CONDITIONER THEN OPS CHKD OK IAW AMM 77-31-03/401, AMM 71-00-00/501, IPC 77-31-03-01A. VBV LINKAGE & LEAK VISUAL HMU LEAK CHKD NORMAL IAW AMM 72-36-00, AMM 75-32-00 & PERFORMED FIM 77-00-00-1 CONFIG 1, NO FAULT FOUND. R & R ENG 1 FILTER & LEAK CHKD OK IAW AMM 73-11-03-404-014-J00 & IPC 73-11-03/401. ENG T/O PWR RUN AND ALL PARAMETERS NORMAL IAW AMM 71-00-00/501. PER MCC REQ, R & R NR 1 HMU, OPS CHKD NORMAL IAW AMM 73-21-14/401 & IPC 73-21-14-01. ACCOMPLISHED NR 1 ENG POWER ASSURANCE CHK, ALL NORMAL IAW AMM 71-00-00/501.

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