Basic Instrument Maneuvers
Instrument Flight
Accelerating Timed Turn
Using a 3 second lead begin the maneuver by simultaneously advancing the throttle to MRT and rolling
the aircraft to a bank angle (approximately 10 percent of the airspeed) for a 1/2 standard rate turn. You
can accurately predict that the bank will require an increase in back stick pressure to maintain level flight.
On the other hand, as the airspeed increases, the aircraft will tend to pitch up, requiring less aft stick to
maintain level flight. To maintain solid aircraft control during the maneuver, you must perform a very
efficient scan. Scan the ADI for pitch and bank control, the altimeter and/or VSI for pitch performance
information, the airspeed indicator for power performance information, and the clock for turn performance
information. Additionally, as airspeed builds, you will have to increase AOB to maintain a turn rate of
1 needle-width deflection. You will normally perform this accelerating airspeed turn from 200 to 250 KIAS.
Throttle: MRT (for 20 KIAS increase or greater)
Bank angle: Approximately 10 percent of IAS (1 needle-width)
Clock: Every 20 seconds for 30 degrees of heading change
Pitch: As required to maintain altitude
Lead point for roll-out: 1/3 of the AOB
Lead point for power reduction: 5 KIAS
Trim: As required
Proper trim is key to maintaining good aircraft control during the maneuver.
Decelerating Timed Turn
Begin the decelerating airspeed turn by using a 3 second lead simultaneously reducing the throttle to the
power setting for the new airspeed while extending the speed brakes. Roll the aircraft to a bank angle
giving a 1/2 standard rate turn (approximately 10 percent of the airspeed at altitude). When you extend
the speed brakes, expect a pitch-up and anticipate the need to retrim the aircraft to maintain altitude. You
can accurately predict that the bank will require an increase in back stick to maintain level flight. As the
airspeed decreases, the aircraft will tend to pitch down, requiring further back stick to maintain level flight.
Include in your scan the ADI for pitch and bank control, the altimeter and/or VSI for pitch performance
information, the airspeed indicator for power performance information, and the clock for turn performance
information. As airspeed falls, you will have to decrease bank angle to maintain a 1/2 SRT. Normally, this
maneuver is performed from 250 to 200 KIAS.
Throttle: Setting for desired airspeed
Bank angle: Approximately 10 percent of IAS (1 needle-width)
Speed brakes: Extend (if 20 KIAS change or greater)
Pitch: As required to maintain altitude
Clock: Every 20 seconds for 30 degrees of heading change
Lead point for speed brake retraction: 5 KIAS
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