FLIGHT MANUAL
DYNALI HELICOPTER COMPANY
Edition N°3
DYNALI H2S January 2012
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6
Veterans beware! Almost half of all light helicopter accidents occur with pilots
unaccustomed to these types but who have more than 1000 hours flying time on
larger machines.
Do not land in long grass :
Danger for the fans
Danger of snagging the undercarriage skids
Fire risk danger : the exhaust may set fire to the grass.
ALWAYS THINK OF YOUR SAFETY DURING FLIGHT AND BE AWARE OF THE
LOCAL POSSIBILITIES FOR AUTO-ROTATION.
WHEN FLYING IN MOUNTAINOUS REGIONS THINK OF YOUR CLEARANCE AT
ALL TIMES AND WATCH YOUR RPM, ESPECIALLY DURING SHORT FINAL
APPROACH !
Landing and taking off among trees places you in danger for a short time. It is up to you to
evaluate the risks. Always calculate a safe trajectory and bear in mind the possibility of
engine failure.
REDUCTION OF MENTAL FACULTIES IN FLIGHT (HUMAN FACTORS)
It should be remembered that, in flight, we are not in our natural element. Our analytical
capacity is reduced by unconscious stress and this becomes more severe in the event of
problems as we lose part of our faculties. We no longer notice factors which worsen the
situation (obstacles, loss of RPM,…) and we easily accumulate errors. In flight, our analytical
capacity is reduced by half.
Accidents are always the consequence of an accumulation of circumstances.
All possible sources of failures must be studied with an instructor.
OTHER RISK FACTORS…
With a heavy payload, limitations are more restricted.
Wind shifts and other aerial phenomena must be taken into account.
The vortex danger : descending too fast and catching up with your own turbulence.
The rotor operates in turbulent air and loses a large part of its lift. This phenomenon
is present at all altitudes : 10,000 or 10 feet. A too rapid vertical descent or a forward
moving descent with a tail wind. Descending between obstacles while moving slowly
forward and with a light tail wind!!
The « buzzing » of friend
ʼ
s homes, which is the first cause of crash.
Reduced power margin.
Theoretical example :
If the power when stationary is X, the transition to forward flight
requires additional power, thus equal to a minimum of X + y, if the transition is commanded
too suddenly and with too much amplitude towards forward flight, the power demand may be
greater than the available reserve of power. Conversely, if you transition from hover to
forward flight with gentle movements of the controls you will cause your aircraft to accelerate
into forward flight with very little extra power.
Theoretical example :
you fly
one circuit and you land. If you slow down too quickly with a
high sink rate on the vertical speed indicator, you may lack the power to stop your aircraft in
hover position. Always opt for a safe final approach with a vertical speed indicator showing
