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1. Thrust control — Lower. Adjust RRPM to
maintain approximately 104 percent.
2. Airspeed — Adjust to maintain approximately
100 KIAS.
3. Trim — Adjust cyclic and pedals to obtain
aminimum of one ball width out of trim to the
right (left pedal forward) equivalent to a bank
angle of approximately 8 to 10 degrees right
and a zero turn rate.
4. Recovery — Initiate at or above 600 feet
AGL,retrim the ball to centered flight and adjustairspeed
to approximately 70 KIAS.
Low Speed Maneuvering Descent. Maneuvering the helicopter
in steep turns as described below should allow
the pilot to fly the helicopter over his intended area during
the descent, observe his area of intended touchdown,
and make adjustments as required.
1. Thrust control — Lower. Adjust RRPM to
maintain approximately 102 percent.
2. Airspeed — Adjust to maintain 70 to 90 KIAS.
3. Bank angle — Adjust as required. Bank
angles of up to 60 degrees will result in
thedesired rates-of-descent.
4. Recovery — Initiate at or above 600 feet AGL.
Helicopter should be returned to wings level.
9-1-66. Autorotative Landing.
a. An autorotative landing will be accomplished after the
failure of both engines. Maintain speed at or above the
minimum (R/D) airspeed in autorotation with cyclic.
b. At approximately 50 to 75 feet above ground level,
apply aft cyclic control as necessary (not to exceed 2
nose-high altitude) to initiate a smooth deceleration.
Maintain RRPM below 108 per cent by adjusting thrust as
necessary. Do not allow RRPM to decay below 91 percent
prior to deceleration for touchdown.
c. At approximately 15 feet aft gear height, apply
suffucuent thrust to slow the R/D, assist deceleration, and
effect a smooth touchdown in ETL. The amount of thrust
applied and the rate at which it is applied will vary depending
on the wind, load, and other influencing factors. Maintain the
landing attitude, if possible, with cyclic and thrust until
forward speed has ceased, then smoothly lower thrust until
the forward landing gear touches the ground. Apply brakes
as required.
d. Whenever a touchdown into the wind under fully controlled
conditions cannot be made, execute a crosswind
landing. It is better to perform a crosswind landing, which
can be executed from sufficient altitude to stop drift and
reduce R/D, than to continue a turn into the wind with the
great possibility of a hard landing and damage to the helicopter.
Decelerate the helicopter at the same altitude as
though the helicopter were making the entire approach into
the wind.
TM 1-1520-240-10
9-1-27
e. Stop all drift and perform the initial touchdown on the
upwind aft landing gear. In a strong wind it may be necessary
to hold the helicopter in what is , in effect, a slip by cross
control.
f. After touchdown, allow the helicopter to settle on the
other landing gear. Perform the ground roll in the same
manner as a landing made into the wind.
9-1-67. Emergency Entrance.
a. Access to the cockpit is through the pilot and copilot
jettisonable doors. (Figure 9-1-2).
b. Entry to the cargo compartment can be accomplished
by opening the cabin door, upper cabin door escape hatch,
cabin escape hatch, ramp escape hatch, and cutout panels.
All escape hatches can be opened by pulling out the yellow
tab and pushing out the panels.
c. Entry to the aft cargo compartment can be made by
manually positioning the ramp control (exterior access) to
the open position.
9-1-68. Ditching.
There is sufficient buoyancy and lateral righting moment
to remain afloat and upright for a sufficient length of time
to permit the passengers and crew safe egress. Refer to
figure 9-1-9 for desired ditching exits for clearing of passengers
and crew.
9-1-69. Ditching — Power ON.
If ditching is to accomplished while power is still available,
plan the approach so that the final descent is made
at 90 to the primary wave pattern and terminates in a
hover 5 to 10 feet above the water. When stabilized in
hover, discharge the passengers or wait until the helicopter
is in the water and the rototrs have stopped turning.
If ditching becomes necessary, proceed as follows:
1. Land away from personnel in water.
2. EMER ENG SHUTDOWN.
9-1-70. Ditching — Power OFF.
a. Maintain the desired airspeed at or above the minimum
R/D airspeed and RRPM in the normal operating
range by adjusting the thrust as necessary. At approximately
100 feet above the water, perform a gradual longitudinal
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