Which would be the correct reaction when hydroplaning is suspected upon landing?
-
A
If all wheels are in motion, brake moderately. Maintain directional control by aerodynamic means.
-
B
Add power and use flaps and spoilers to brake aerodynamically.
-
C
Apply maximum braking to reduce aircraft speed to less than hydroplaning speed, then continue normal ground roll.
-
D
Cross rudder and aileron controls in order to use the aircraft fuselage to brake aerodynamically.
During take-off and landing operations from contaminated runways, aquaplaning (hydroplaning) is a hazard that must be considered, because a "bow wave" effect is created in front of the tyre. For a given specific gravity of the contaminant and the tyre pressure, a speed will exist at which the tyre will ride up over the "bow wave" and friction with the runway will rapidly reduce, thus, increasing the rolling distance.
When hydroplaning is suspected upon landing, the correct reaction would be to apply moderate braking and maintain directional control using aerodynamic means for the following reasons:
-
Moderate Braking: During hydroplaning, the tyres lose traction with the runway due to a layer of water. Moderate braking prevents the wheels from locking up. Locked wheels can worsen hydroplaning and cause loss of control.
-
Aerodynamic Control: Utilizing aerodynamic control (rudder and ailerons) helps maintain directional control because the wheels may not have enough traction. Aerodynamic control allows the Pilot to steer the aircraft effectively despite the reduced friction.
Your Notes (not visible to others)
This question has appeared on the real examination, you can find the related countries below.
-
Austro Control