Helicopter Instrument Turns[PDF]
Turns in attitude instrument flying are accomplished by reference to the instruments and require an effective cross-check and calculation. They can be made with different angles and rates but most of the instrument procedures require a standard rate of turn.
- Altimeter is primary instrument for pitch
- Airspeed indicator is primary instrument for power
- Attitude indicator is primary instrument for bank initially and supporting instrument for pitch
- Vertical speed indicator is supporting instrument for pitch
- Turn-and-slip indicator is primary instrument for bank when turn is established
Standard Rate Turn
For example, the required bank for a standard rate of turn for a helicopter flying at 60 knots is:
- To enter a turn, apply lateral cyclic in the direction of the desired turn. The entry should be accomplished smoothly, using the attitude indicator to establish the approximate bank angle
- When the turn indicator indicates a standard rate turn, it becomes primary for bank. The attitude indicator now becomes a supporting instrument
- If an increase in power is required to maintain airspeed, slight forward cyclic pressure may be required since the helicopter tends to pitch up as collective pitch is increased. Apply pedal trim, as required, to keep the ball centered
- To recover to straight-and-level flight, apply cyclic in the direction opposite the turn. The rate of roll-out should be the same as the rate used when rolling into the turn
- When the helicopter is approximately level, the heading indicator becomes primary for bank as in straight-and-level flight
Turn to a Predetermined Heading
Turning to a predetermined heading is starting and ending your turn at a specific heading.
A helicopter turns as long as its lateral axis is tilted; therefore, the recovery must start before the desired heading is reached.
A timed turn is a turn during which the clock and turn-and-slip indicator are used to change heading a definite number of degrees in a given time.
Change of Airspeed and Altitude in Turns
Changing airspeed or altitude individually or jointly in turns is an effective manoeuvre for increasing proficiency in all three basic instrument skills.
Since the manoeuvre involves simultaneous changes in all components of control, proper execution requires a rapid cross-check and interpretation, as well as smooth control.
Proficiency in the manoeuvre also contributes to confidence in the instruments during attitude and power changes involved in more complex manoeuvres.
Conditions and objective
- Calculate required bank
80/10=8 8/2=4 8+4=12
- Reset timer
- Timer 31 seconds
- Heading East
- Instrument Flying Handbook (FAA-H-8083-15B)
- VID 522050- Creation
DATE OF SUBMISSION
- 12:50, 23 February 2021
- This documentation is copyrighted as part of the intellectual property of the International Virtual Aviation Organisation.
- The content of this documentation is intended for aviation simulation only and must not be used for real aviation operations.