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<p><a href="page.php?w=visual_flight_rules">visual flight rules</a>), to see something lower, to enter warmer air (see <a href="page.php?w=adiabatic_lapse_rate">adiabatic lapse rate</a>), or to take advantage of wind direction of a different altitude, particularly with balloons.</p>

<p>Normal descents take place at a constant airspeed and constant angle of descent (3 degree <a href="page.php?w=final_approach_%28aviation%29">final approach</a> at most airports). The pilot controls the angle of descent by varying engine power and <a href="page.php?w=pitch_%28aviation%29">pitch</a></p><p>
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