Instrument Flight
Constant Airspeed Climbs and Descents
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 pitchup 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 display for pitch and bank control, the altitude trend indicator and/or VSI for
pitch performance information, the airspeed trend 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 kts
Lead point for roll-out: 1/3 of the AOB
Trim: As required
Again, keeping the pressure trimmed off the stick during the maneuver is an important element in
accomplishing the maneuver smoothly.
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