Flight Instructor – Instrument Rating Powered-Lift › V. Air Traffic Control (ATC) Clearances and Procedures › Task A. Compliance with Air Traffic Control Clearances

PI.V.A.S5

Skill

Maintain the applicable airspeed ±10 knots, headings ±10°, altitude ±100 feet; track a course, radial, or bearing within ¾-scale deflection of the course deviation indicator (CDI).

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Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Instrument Flying Handbook p. 8-8
Chapter 8: Helicopter Attitude Instrument Flying › Turn Indicator › Power Control During Straight-and-Level Flight
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 ... 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 8-9 and 8-10. After the airspeed stabilizes at slow cruise…
Instrument Flying Handbook p. 7-39
Chapter 7, Section II: Airplane Basic Flight Maneuvers › Straight-and-Level Flight › Power Settings
Power Settings Power control and airspeed changes are much easier when approximate power settings necessary to maintain various airspeeds in straight-and-level flight are known in advance. However, to change airspeed by any appreciable amount, the common procedure ... underpower or overpower on initial power changes to accelerate the rate of airspeed change. (For small speed changes, or in airplanes that decelerate or accelerate rapidly, overpowering or underpowering is not necessary.) Consider the example of an airplane that requires…
Instrument Flying Handbook p. 7-5
Chapter 7, Section I: Airplane Basic Flight Maneuvers › Straight-and-Level Flight › Vertical Speed Indicator (VSI)
Figure 7-10. Pitch correction, less than 100 feet—one-half bar low to correct altitude error. When using the VSI as a rate instrument and combining it with the altimeter and attitude indicator to maintain level flight, a pilot ... should know that the amount the altimeter needle moves from the desired altitude governs the rate that should be used to return to that altitude. A rule of thumb is to make an attitude change that results in a vertical…
Instrument Flying Handbook p. 8-5
Chapter 8: Helicopter Attitude Instrument Flying › Straight-and-Level Flight › Airspeed Indicator
first neutralizing the controls and allowing the pitch attitude to stabilize, then readjusting the pitch attitude by noting the indications of the other pitch instruments. Occasionally, the VSI may be slightly out of calibration. This could result in the instrument ... indicating a slight climb or descent even when the helicopter is in level flight. If the instrument cannot be calibrated properly, this error must be taken into consideration when using the VSI for pitch control. For example, if a descent…
Instrument Flying Handbook p. 7-8
Chapter 7, Section I: Airplane Basic Flight Maneuvers › Straight-and-Level Flight › Turn-and-Slip Indicator (Needle and Ball)
forces of gravity, drag, and inertia to determine airplane performance. Power control must be related to its effect on altitude and airspeed, since any change in power setting results in a change in the airspeed or the altitude ... airplane. At any given airspeed, the power setting determines whether the airplane is in level flight, in a climb, or in a descent. If the power is increased in straight-and-level flight and the airspeed held constant, the airplane…