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Colorful warnings |
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Training TipsColorful warningsThe most reliable way to achieve a stabilized final approach, crowned by a textbook landing, is to effect precise speed and configuration changes from the moment you begin the descent from the traffic pattern. Many flawed approaches trace back to incorrect or delayed establishment of recommended airspeeds and configurations, leading to fixation or distraction during this critical phase.
Fortunately, color-coded airspeed indicators installed in FAA-certificated aircraft manufactured after 1945, and of 12,500 pounds or less, can alert the pilot at a swift glance to airspeed in need of correction during the approach and landing sequence.
Downwind, preparing to decelerate and descend, the pilot reduces power to a predetermined setting and maintains altitude with gentle back pressure to slow the aircraft from the normal operating range (green arc) into the approach-speed realm (white arc). When the airspeed enters the white arc, the aircraft is ready for configuration changes.
The white arc is “commonly referred to as the flap operating range since its lower limit represents the full flap stall speed and its upper limit provides the maximum flap speed. Approaches and landings are usually flown at speeds within the white arc,” explains Chapter 7 of the Pilot’s Handbook of Aeronautical Knowledge. (Questions on this subject appear on the Private Pilot Knowledge Test; review Learning Statement Code PLT088.)
Retrimming hastily for the new configuration is frequently a cause of airspeed errors. Be sure the aircraft has stabilized under the new power-pitch-flaps combo—or the outcome will not be what you had in mind.
Stabilized? Power changes can now control the descent until you change the flap setting again, when retrimming will again be needed. If you plan to maintain the current airspeed when adding flaps, remember to lower the nose to offset the additional induced drag.
The airspeed indicator’s color coding—including the cautionary yellow arc, and the red radial line depicting V NE (never-exceed speed)—sends easy-to-interpret safety messages in other phases of flight such as cruise flight and during maneuvers.
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