Service difficulty report · Heat Exchanger · Boeing 74747UF

Difficulty date
August 7, 2026
Submitted
August 10, 2026
Operation
Air carrier
Aircraft
N408MC
Make and model
Boeing 74747UF
Aircraft serial
29261
Aircraft time
105,346 hours, 17,677 cycles
Engine
Ge CF680C2B5F
Part
Heat Exchanger
Part number
1601425
Part serial
3044
Condition
Faulted
Location
Fuel/Oil Sys
Stage of operation
CR
How discovered
O
Nature of condition
M, J, Y
Precautionary procedure
E, A

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

What was found

ENG 2 OIL TEMP EICAS MSG. FL 380 MAX OIL TEMP APPROX 194. ENG 2 SHUT DOWN. PERFORMED FIM 79-00, FT FIG 109. R & R FUEL/OIL HEAT EXCHANGER IAW AMM 79-21-01-404-014-J00, OPS CHECK & LEAK CHECKED GOOD. RUN ENG NR 2 AT DIFFERENT POWER SETTINGS AND OIL TEMP NORMAL PARAMETERSIAW AMM 71-00-00 & IPC 79-21-09-05.

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