TM 1-1520-240-10
8-3-1
SECTION III. FLIGHT CHARACTERISTICS
8-3-1. General.
The flight characteristics of the helicopter throughout the
flight envelope and at all gross weights are good. The
flight characteristics remain essentially the same
throughout the CG and GW range. There is no marked
degradation of flying qualities as altitude increases.
8-3-2. AFCS Off Flight Characteristics.
The AFCS is required to provide the helicopter with adequate
stability. Therefore, the stability of the helicopter
will be reduced when operating with AFCS off. With practice,
the pilot will know in advance what to expect and
should have little trouble controlling the helicopter as
long as established limitations (refer to Chapter 5) and
certain techniques are adhered to. In general, the AFCS
off flight characteristics are enhanced by spoilers on the
forward pylon, strakes on the fuel pods and ramp, and a
blunted aft pylon. The AFCS may be turned off at any
airspeed and turned back on at or near the turn-off-airspeed.
If airspeed at turn-on is different from that at turnoff,
a low rate pitch transient accompanied by momentary
illumination of the AFCS OFF caution capsules may occur.
These symptoms indicate that a DASH error signal
existed a turn-on and that the DASH actuator is running
at a reduced rate to cancel the error signal. When the
cautions are extinguished, the error signal is cancelled,
and normal DASH operation has resumed. During this
period, when the error signal is being cancelled, the remaining
AFCS features function normally. AFCS off flight
will not be difficult when the following techniques are
used:
a. Maintain airspeed below established limits.
b. Enter all maneuvers smoothly, keep control movements
coordinated and avoid overcontrol.
c. Consistently scan the turn-and-slip indicator to
maintain trim flight.
d. React positively but smoothly to divergent movements.
8-3-3. Center Hook Loads.
In general, the helicopter possesses excellent flight characteristics
when performing an external load mission.
The combination of power available, the load carried
beneath the CG, and the design of the cargo hook system
make loads of minimum or maximum weight relatively
easy to carry and handle safely. The type loads carried
can usually be broken down into three major groups: low
density, high density and aerodynamic. Each type load
mentioned displays characteristics all its own and therefore
must be discussed separately.
CAUTION
Do not lift or rotate the center cargo hook
into the cabin area or allow the mid hook to
lay on the cargo floor or access door panel
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