SDR SWAA2019071834991

Service difficulty report · Control Valve · Boeing 7377H4

Difficulty date: July 17, 2019
Submitted: July 19, 2019
Operation: Air carrier
Aircraft: N489WN
Make and model: Boeing 7377H4
Aircraft serial: 33855
Aircraft time: 51,878 hours, 30,692 cycles
System (JASC): 2780 · Leading Edge Slat Control System
Part: Control Valve
Part number: 4163DA
Part serial: 6148
Condition: Faulty
Location: Flap/Slat
Stage of operation: CL
How discovered: O
Nature of condition: F, J
Precautionary procedure: A

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

What was found

AIR TURNBACK, DURING CLIMBOUT WE NOTICED WE HAD A LE FLAPS TRANSIT LIGHT ILLUMINATED. THIS APPEAR PANEL LEADING EDGE DEVICE INDICATOR SHOWED SLATS 3,4,5,6 AMBER IN DISAGREEMENT TO FLAP POSITION. WE RAN APPROPRIATE QRH AND RETURNED TO DEPARTURE AIRPORT. R&R LEADING EDGE FLAP AND SLAT CONTROL VALVE IAW AMM.

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