The Sierra Pattern uses (the natural tendency of an aircraft to exchange airspeed for altitude). You descend slightly faster to gain 250 knots, then pitch up to convert that speed back to altitude, slowing to 200 knots. This cyclical "pumping" keeps the engine cores spinning 5-8% faster than a steady-state glide.
: Success depends on using specific pitch and thrust settings derived from a Mental Calculation Booklet .
For the pilot, flying a Sierra Pattern means ignoring the screaming altitude alert, ignoring the instinct to pitch for best glide (which is 180 knots, not 220), and instead deliberately flying a series of inefficient, G-loaded turns at 25,000 feet while the cabin altitude climbs past 15,000 feet.
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