Chapter 8—Approaches and Landings |
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Table of Contents Normal Approach and Landing Base Leg Final Approach Use of Flaps Estimating Height and Movement Roundout (Flare) Touchdown After-Landing Roll Stabilized Approach Concept Intentional Slips Go-Arounds (Rejected Landings) Power Attitude Configuration Ground Effect Crosswind Approach and Landing Crosswind Final Approach Crosswind Roundout (Flare) Crosswind Touchdown Crosswind After-Landing Roll Maximum Safe Crosswind Velocities Turbulent Air Approach and Landing Short-Field Approach and Landing Soft-Field Approach and Landing Power-Off Accuracy Approaches 90° Power-Off Approach 180° Power-Off Approach 360° Power-Off Approach Emergency Approaches and Landings (Simulated) Faulty Approaches and Landings Low Final Approach High Final Approach Slow Final Approach Use of Power High Roundout Late or Rapid Roundout Floating During Roundout Ballooning During Roundout Bouncing During Touchdown Porpoising Wheelbarrowing Hard Landing Touchdown in a Drift or Crab Ground Loop Wing Rising After Touchdown Hydroplaning Dynamic Hydroplaning Reverted Rubber Hydroplaning Viscous Hydroplaning |
SOFT-FIELD APPROACH AND LANDING Landing on fields that are rough or have soft surfaces, such as snow, sand, mud, or tall grass requires unique procedures. When landing on such surfaces, the objective is to touch down as smoothly as possible, and at the slowest possible landing speed. The pilot must control the airplane in a manner that the wings support the weight of the airplane as long as practical, to minimize drag and stresses imposed on the landing gear by the rough or soft surface. The approach for the soft-field landing is similar to the normal approach used for operating into long, firm landing areas. The major difference between the two is that, during the soft-field landing, the airplane is held 1 to 2 feet off the surface in ground effect as long as possible. This permits a more gradual dissipation of forward speed to allow the wheels to touch down gently at minimum speed. This technique minimizes the nose-over forces that suddenly affect the airplane at the moment of touchdown. Power can be used throughout the level-off and touchdown to ensure touchdown at the slowest possible airspeed, and the airplane should be flown onto the ground with the weight fully supported by the wings. [Figure 8-24] The use of flaps during soft-field landings will aid in touching down at minimum speed and is recommended whenever practical. In low-wing airplanes, the flaps may suffer damage from mud, stones, or slush thrown up by the wheels. If flaps are used, it is generally inadvisable to retract them during the after-landing roll because the need for flap retraction is usually less important than the need for total concentration on maintaining full control of the airplane. The final approach airspeed used for short-field landings is equally appropriate to soft-field landings. The use of higher approach speeds may result in excessive float in ground effect, and floating makes a smooth, controlled touchdown even more difficult. There is, however, no reason for a steep angle of descent unless obstacles are present in the approach path. Touchdown on a soft or rough field should be made at the lowest possible airspeed with the airplane in a nose-high pitch attitude. In nosewheel-type airplanes, after the main wheels touch the surface, the pilot should hold sufficient back-elevator pressure to keep the nosewheel off the surface. Using back-elevator pressure and engine power, the pilot can control the rate at which the weight of the airplane is transferred from the wings to the wheels. Field conditions may warrant that the pilot maintain a flight condition in which the main wheels are just touching the surface but the weight of the airplane is still being supported by the wings, until a suitable taxi surface is reached. At any time during this transition phase, before the weight of the airplane is being supported by the wheels, and before the nosewheel is on the surface, the pilot should be able to apply full power and perform a safe takeoff (obstacle clearance and field length permitting) should the pilot elect to abandon the landing. Once committed to a landing, the pilot should gently lower the nosewheel to the surface. A slight addition of power usually will aid in easing the nosewheel down. The use of brakes on a soft field is not needed and should be avoided as this may tend to impose a heavy load on the nose gear due to premature or hard contact with the landing surface, causing the nosewheel to dig in. The soft or rough surface itself will provide sufficient reduction in the airplane’s forward speed. Often it will be found that upon landing on a very soft field, the pilot will need to increase power to keep the airplane moving and from becoming stuck in the soft surface. Common errors in the performance of soft-field approaches and landings are:
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