When using the Flap Selector Valve button, approximately how long per press should you depress and hold the LOWER or RAISE button?

• A. Approximately 1 second per press
• B. Approximately 0.5 seconds per press
• C. Approximately 2 seconds per press
• D. Approximately 3 seconds per press

Answer: (A)

Flap changes are made in discrete steps through momentary presses of the LOWER or RAISE control. Each press is intended to drive the flaps to the next detent and give the hydraulic actuators time to respond and settle into the new position. About one second per press provides enough time for the system to reach the commanded position reliably before you release. Pressing shorter may leave the flaps partially moved or in doubt; pressing longer can cause the system to move beyond the intended position or behave unpredictably. So, approximately one second per press is the standard for this operation.