5.5.1 Using the figures above, the following additional safety factors should be
applied to the distance to clear a 15metre obstacle (taken from CAA GA Safety
Sense leaflet 7B). If unsure, always use these factors to ensure you have
sufficient take-off distance available.
Per 1000 ft runway height above Sea Level
Multiply by 1.1
Per 10°C increase in temperature above 15°C
Multiply by 1.1
Per 2% uphill slope
Multiply by 1.1
Soft ground or snow or wet grass
Multiply by 1.25
If it is very soft (or wet), or the snow is more than 1”deep
Multiply by 1.6
If you have to take-off with a tailwind
Multiply by 1.2 for every 4 knots
of wind
Now to be sure, multiply by 1.33, to take into account that you may not fly the aeroplane as well as
the company test pilot did when he worked out the values in the manual.
5.6
Landing performance
Landing performance for short dry grass for your
aircraft are contained in Annex A. Using the figures above, the following
additional safety factors should be applied to the distance to clear a 15metre
obstacle on the approach (taken from CAA GA Safety Sense leaflet 7B). If
unsure, always use these factors to ensure you have sufficient runway to
avoid using the considerately provided hedge at the far end of the runway.
For every 1000ft you are above sea level
multiply by 1.05
For every 10
0
C above 15
0
C air temperature
multiply by 1.05
For every 2
%
of downslope
multiply by 1.1
If the runway is tarmac or concrete
multiply by 1.2
If the ground is soft, or there is snow or wet grass
multiply by 1.25
If the ground is very soft (or wet) or if the snow is more
than 1” deep
multiply by 1.6
If you have to land with a tailwind
multiply by 1.2 for every 4
knots of wind
Now to be sure, multiply by 1.33, to take into account that you may not fly the aeroplane as
well as the company test pilot did when he worked out the values in the manual.
Skyranger Operators Manual, Issue 1, AL0, June 2002
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