Service difficulty report · Switch · Boeing 7377H4

Difficulty date
July 10, 2025
Submitted
July 10, 2025
Operation
Air carrier
Aircraft
N458WN
Make and model
Boeing 7377H4
Aircraft serial
33857
Aircraft time
70,804 hours, 42,423 cycles
Part
Switch
Condition
Overheated
Location
Zn 200 Fus Top
Stage of operation
CR
How discovered
O
Nature of condition
M, J
Precautionary procedure
O

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

What was found

B HYD OVERHEAT AT CRUISE. FL340. ELECTRIC PUMP. ALT FLAP EXT & LANDED FLAPS 15. NO BRAKE OVHT. T/S PER FIM 29-30 TASK 806 FOUND HYD SYS B OVERHEAT SWITCH AND CONNECTOR SHORTED. REMOVED AND REPLACED SYS B OVERHEAT SWITCH PER AMM 29-32-12. REMOVED AND REPLACED OVERHEAT SWITCH CONNECTOR PER SWPM 20-61-19. REMOVED AND REPLACED HYD SYS B CASE DRAIN FILTER PER AMM 29-11-41 NO ABNORMALITIES NOTED IN FILTER OPS & LEAK CKD OK. RETURNED FLT DECK SWITCHES TO ORIGINAL CONFIG.

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