Effects Of The Wind - Pipistrel ALPHA Trainer LSA Pilot Operating Handbook

SECTION 5
PERFORMANCE DATA
5.6.4.

EFFECTS OF THE WIND

Wind (head, cross or tailwind) affects aircraft's ground speed (GS).
Headwind on takeoff or landing causes the takeoff and landing distance
length to shorten as the GS is slower during these two flight stages. The
opposite holds true for tailwind on takeoff and landing as tailwind increases
takeoff and landing distances significantly.
The table below provides data about the effect of the wind (headwind "+",
tailwind "-") on takeoff runway lenght. Data is referenced for sea level (SL)
performance at MTOM.
DISTANCE
[ft] /
-6 kts
[m]
680 /
Ground roll
270
1130 /
50 ft / 15 m
345
obstacle
WARNING:
Tailwind affects takeoff and landing performance by more
than twice as much as headwind does.
Headwind shortens takeoff and landing distances by 25 feet with every 3
kts of wind increase (e.g. provided there is a 6 kts headwind on takeoff and
landing, distances will be approximately 50 ft (16 meters) shorter than ones
published in the manual).
Tailwind increases takeoff and landing distances by 60-65 feet with every 3
kts wind increase (e.g. provided there is a 6 kts tailwind on takeoff or landing,
distances will be approximately 120-130 feet longer then ones published in
the manual).
CAUTION: The maximum allowed crosswind component speed on takeoff
and landing is 18 kts (33 km/h). In these conditions it is recommended not to
takeoff with flaps positioned at +2.
CAUTION: The runway length required increases by 10 % for every 5 kts of
crosswind component.
PAGE
5-10
WIND SPEED
-4 kts -2 kts 0 kts
645 / 605 / 555 /
197 184 170
1065 / 965 / 870 /
325 294 265
ALPHA Trainer LSA
Pilot Operating Handbook
+4 kts +8 kts +12 kts
525 / 495 / 480 /
160 151 146
810 / 760 / 720 /
247 232 220
POH-162-00-40-001
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