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airspeed changes. Also, when operating
with altitude hold, limit bank angles to
45 degrees maximum. An excessive bank
angle may result in an altitude loss, and if
operating at a high gross weight, an overtorque
condition.
* 1. AFCS Control Panel — As required.
F* 2. Ramp area — The ramp area must be
checked every 30 minutes of flight.
* 3. Fuel Consumption — Check.
8-2-30. DESCENT.
Refer to Chapter 7 for power requirements at selected
airspeeds and rates of descent.
8-2-31. Before Landing.
The following checks must be accomplished prior to
landing:
* 1. Systems — Check indications of the following:
a. Rotor.
b. Torque.
c. Engine.
d. Transmission.
e. Fuel.
f. 712 Master caution panel.
g. 714A Caution/Advisor Panel.
* 2. PARKING BRAKE — As required.
* 3. AFCS control panel — Check as follows:
a. AFCS HDG and ALT switches as required.
b. CYCLIC TRIM switches as required.
c. AFCS selector switch as required.
F* 4. Crew, passengers, and mission equipment
— Check.
* 5. Searchlight — As required.
8-2-32. Landing.
Refer to Aircrew Training Manual (ATM).
8-2-33. Landing from a Hover to Water.
Prior to landing, the PITOT HEAT switch must be ON.
The ramp, lower half of the cabin door, lower rescue door,
and drain plugs must be closed. Landing/searchlights
shall be retracted. From a stabilized hover, decrease
thrust for a smooth rate of descent. A vertical descent,
rather than a descent with some forward movement, will
tend to disperse the swirling water spray under a no-wind
condition. As the aft wheels and then the fuselage near
the water, continue to lower the thrust control to ground
detent. As more of the fuselage enters the water, buoyancy
will level the helicopter attitude.
TM 1-1520-240-10
8-2-15
NOTE
Aft landing gear ground proximity switches
are not actuated during a water landing.
Therefore, longitudinal cyclic pitch actuators
must be manually set to ground position.
CAUTION
If contact is made with floating debris,
return to hover and assess damage.
As the attitude approaches level, the helicopter will start
moving forward and stabilize at approximately 4 to 5
knots. This speed will be attained with the controls in
neutral and the thrust control at the ground detent. The
water level will not vary significantly because of GW or
CG. As observed from the cockpit, the water level will
appear to intersect the fuselage below the lower nose
enclosure.
8-2-34. Running Landing to Water.
Running landings can be performed within the limitations
shown in Chapter 5, but should be performed only during
training missions, actual single-engine conditions when a
hovering approach is not possible, or when atmospheric
conditions dictate. Running landings for training should only
be performed to calm water (Sea State 1 or less).
Prior to performing a running landing to the water, the
PITOT HEAT switch must be ON. The ramp, lower half
of the cabin door, lower rescue door, and drain plugs
must be closed. Landing/searchlights shall be retracted.
The approach is shallow and flown at an airspeed that
provides safe aircraft control. Prior to water entry, it may
be necessary to use the windshield wipers. Entry of the
aft wheels into the water is easily recognized because
the helicopter will decelerate noticeably. Touchdown attitude
should be held constant until the apparent water
speed has decreased below 10 knots. At or below 10
knots, the nose can be lowered to the water by lowering
the thrust control rod and neutralizing the cyclic stick. A
4 to 5 knot forward speed will result when the helicopter
is level and the controls are neutralized with the thrust
control at the ground detent.
NOTE
Aft landing gear ground switches are not actuated
during a water landing, Therefore, longitudinal
cyclic pitch actuators must be manually set
to ground position.
When the helicopter is in the water, two-way communication
is lost on system whose antennas are submerged.
The HF radio can be operated.
8-2-35. After Landing.
1. Flight controls — Neutralize.
2. Cyclic trim indicators — Check GND indication.
F 3. Ground contact lights — Check both ON.
4. AFCS SYSTEM SEL switch — As required.
5. SWIVEL switch — As required.
6. Transponder — As required.
7. Searchlight — As required.
8. ANTI-ICE switches — OFF, as required.
8-2-36. After Landing (Abbreviated).
　
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