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both airspeed and altitude are low, or if both are high, changes
in both power and pitch attitude are necessary.
To make power control easy when changing airspeed, it is
necessary to know the approximate power settings for the
various airspeeds at which the helicopter is flown. When the
airspeed is to be changed by any appreciable amount, adjust
the power so that it is over or under that setting necessary
to maintain the new airspeed. As the power approaches the
desired setting, include the manifold pressure in the crosscheck
to determine when the proper adjustment has been
accomplished. As the airspeed is changing, adjust the pitch
attitude to maintain a constant altitude. A constant heading
should be maintained throughout the change. As the desired
airspeed is approached, adjust power to the new cruising
power setting and further adjust pitch attitude to maintain
altitude. The instrument indications for straight-and-level
flight at normal cruise and during the transition from normal
cruise to slow cruise are illustrated in Figures 6-9 and 6-10.
After the airspeed stabilizes at slow cruise, the attitude
indicator shows an approximate level pitch attitude.
The altimeter is the primary pitch instrument during level
flight, whether flying at a constant airspeed or during a
change in airspeed. Altitude should not change during
airspeed transitions, and the heading indicator remains the
primary bank instrument. Whenever the airspeed is changed
by an appreciable amount, the manifold pressure gauge is
momentarily the primary instrument for power control.
When the airspeed approaches the desired reading, the
airspeed indicator again

　
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本文鏈接地址：Instrument Flying Handbook儀表飛行手冊上(122)