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Trade Altitude for Speed

Gemini Sparkle

Key Takeaways:

  • Piston aircraft pilots frequently face a dilemma between air traffic controllers' demands for high approach speeds to maintain traffic flow and instrument instructors' advice for slow, stabilized approaches.
  • Many piston airplanes, like fixed-gear Cirrus models, lack efficient speed reduction methods such as retractable gear or speed brakes, and flap deployment is often restricted to already lower airspeeds.
  • A key technique to manage high speeds is to momentarily "trade altitude for airspeed" by raising the nose, allowing speed to bleed off before flap deployment and glideslope interception, thereby achieving a stabilized approach while fitting traffic flow.
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When you’re flying into an airport where there’s a lot of jet traffic, controllers often ask you to keep things going fast. They might say, “best forward speed,” “maintain 160 knots,” or something to that effect, but the desired outcome is the same regardless of who you are: They want you in your piston airplane to keep up with the kerosene burners … or at least not be a speed bump for them.

The controller’s need for your speed makes it tough to conduct what many instrument instructors teach, that the best (often, the “only”) strategy is to set up for a slow, stabilized numbers-based approach even before you get to the initial fix. I’ve had instructors in the Cirrus advise me to get it below 140 knots before the initial approach fix, a speed that’s often far too slow for the controllers’ liking.

Isabel Goyer

A commercial pilot, Isabel Goyer has been flying for more than 40 years, with hundreds of different aircraft in her logbook and thousands of hours. An award-winning aviation writer, photographer and editor, Ms. Goyer led teams at Sport Pilot, Air Progress and Flying before coming to Plane & Pilot in 2015.

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