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Flight Seven

Advanced Takeoff and Landing Techniques

Flight Seven is an introduction to more sophisticated ways of getting into the air and back onto the ground. These new techniques include soft-field takeoffs and landings, short field takeoffs and landings, no-flap takeoffs and landings , an introduction to forward slips to landing, and crosswind landings. You need to be proficient at working in the traffic pattern and to have developed reasonable proficiency at normal takeoffs and landings as covered in Flight Six before you start work on these more advanced skills.

Soft Field Takeoff

Soft Field Takeoff practical test standards

Soft Field Takeoff and Landing techniques are good skills to have even if you have no intention of exposing yourself or your airplane to the challenge of a real soft field. Most people will learn these techniques on a regular paved runway and seldom, if ever, get to put their skills to work on a real soft field. However, you will definitely be tested on this as part of the private pilot practical test and, in the event of an emergency landing off airport, you will be glad to have this skill available.

To develop your soft field technique, visualize mud. Your objective is to maintain directional control and not get stuck. With just three small wheels and a propeller to work with, this could be challenging. Fortunately, all of your control surfaces can be of use in keeping things rolling and pointed in the right direction. Before you start your taxi, get organized and complete all necessary pre-takeoff checklists so, that at least in theory, you can keep rolling all the way to the runway and take off without stopping. Because of constraints imposed by control towers and crowded tie-down areas etc., you probably will not get to practice this part. A real soft field taxi will require more power than usual to get started and probably more than usual to keep rolling. In a tricycle gear airplane, taxi with the control wheel held all the way back to minimize weight on the nose wheel. The nose wheel is the most likely to get bogged down, so do what you can keep it light.

In many airplanes such as the Cessna 152, the soft field takeoff is performed with 10 degrees of flaps extended. If flaps are to be used, extend them as you taxi onto the runway. In a real soft field situation, tower and traffic permitting, you would taxi onto the runway without stopping and, once lined up on the centerine, apply full power with the control wheel still in the full aft position. You want the nose wheel to come off the ground at the first possible opportunity, but not so swiftly that the airplane rears up and scrapes itís tail on the ground. Most trainers have a tail tie down skid installed to lessen the consequences of scraping the tail. As you add power and accelerate, airflow over the elevator will increase and it will become more effective at raising the nose -- so much so that you will probably need to reduce the backpressure on the control wheel slightly to allow the nose wheel to lift off without the tail scraping. As you add power, you also need to add right rudder to prevent your airplane from unexpectedly exiting the runway to the left due to normal left-turning tendencies that are at their most noticeable in high power/high angle of attack situations.

The idea is to get unstuck from the runway at the first possible opportunity and then build up airspeed in ground effect before attempting to climb out. So, you accelerate down the runway with the control wheel positioned further back than for a normal takeoff. The nose wheel will lift off first and, as you continue to accelerate and maintain directional control with rudder the main wheels will lift off. This happens at a lower airspeed than for a normal takeoff and below the speed at which it is safe to climb out. As soon as all three wheels are off the ground, move the control wheel forward to lower the nose into a straight and level attitude. This allows the airplane to build up more airspeed in ground effect before attempting to climb out.Lowering the nose at this point takes some willpower, since it is not intuitive to lower the nose immediately after liftoff when very close to the ground.

It is important, however, that you do not attempt to climb out of ground effect until your airspeed is at least at best rate of climb speed, Vy. For the purpose of learning/demonstrating your soft field takeoff technique, if the runway environment permits, you may fly along in ground effect a little longer than is strictly necessary. Contrary to what every bone in your body is telling you as you try this the first time, you are unlikely to fly yourself back into the ground unless you are really heavy-handed and not paying attention. You may be heavy-handed but itís safe to say youíll definitely be paying attention during this challenging task. Once the desired airspeed is attained, pitch to begin your climb by applying a little backpressure; then climb out at best rate of climb speed, Vy. Once a positive rate of climb is established, retract the flaps and continue the departure as normal.

Soft Field Landing

Soft Field Landing practical test standards

For a soft field landing, the objective is to land as gently as possible on the main gear and to keep the nose wheel off the ground as long as possible during the rollut to minimize the chances of getting bogged down or flipping the airplane over in severe situations where the nose wheel digs in. Fly a stabilized approach at the recommended speed for the airplane being used and plan on using full flaps. Just before touchdown, add a little power to reduce the sink rate and to provide more elevator authority to help hold the nose wheel off the runway. A power setting just slightly above idle should be sufficient. Touchdown should occur gently in a nose-high attitude. Maintain extra backpressure on the control wheel after touchdown to hold the nose wheel off the runway as long as possible. Donít overdo the backpressure or you will cause the tail tie-down skid to scrape the ground. You will need to be particularly attentive to rudder input to maintain directional control since you will not have the benefit of nose wheel steering initially. Itís particularly important that the airplaneís longitudinal axis is perfectly aligned with the centerline on touchdown. Eventually, as your speed diminishes, there will be insufficient air flowing over the elevator to maintain the nose-high attitude necessary to keep the nose wheel off the ground. The nose wheel should touch down smoothly while you hold the control wheel full aft to minimize the weight on the nose wheel. Exit the runway with the control wheel held full aft and, local conditions permitting, taxi without stopping to the place you intend to tie down the airplane. Once you stop on a truly soft field, you may have trouble moving again.

Once you master the soft field techniques, you can move on to short field takeoffs and landings. Be careful to distinguish between soft field and short field procedures. They are quite different and not interchangeable.

Short Field Takeoff

Short Field Takeoff practical test standards

Short field takeoffs are utilized when it is necessary to get off the ground in the minimum distance and climb relatively steeply to clear obstacles. Many trainers such as the Cessna 152 call for use of 10 degrees of flaps for the short field takeoff. Once pre-takeoff checks are complete, set flaps as appropriate prior to taxiing onto the runway. Taxi onto the runway and stop at the very beginning of the runway so no distance is wasted.

While using your toes to apply the brakes and hold the airplane in position gradually add full power. Check the engine instruments and tachometer for normal indications prior to releasing the brakes. In a real short field situation, itís important to know the airplane is developing full power before attempting to take off with a short runway or obstacles to clear. Hence the run-up to full power prior to brake release. The run-up also prevents wasting runway while you add power. Assuming all indications are normal, release the brakes and accelerate down the runway to rotate as normal and commence a climb out at the recommended obstacle clearance speed or best angle of climb speed, Vx. This will be a more nose high attitude than you have used previously and you will need to be attentive to precise airspeed control. Also, because of the high power setting and high angle of attack, you need to use plenty of right rudder to overcome left-turning tendencies. After clearing obstacles, lower the nose slightly and accelerate to best rate of climb speed, Vy. With a positive rate of climb established, retract the flaps and continue the upwind climb as normal.

In a real short field situation, be particularly attentive to maintaining the correct airspeed. Only the recommended obstacle clearance speed, or Vx, will give you the best angle of climb. Anything faster or slower will not work as well.

Short Field Landing

Short Field Landing practical test standards

The objective of a short field landing is to clear obstacles on final and to land and stop in the minimum distance possible. Landing on a short field and clearing any obstacles on final approach entails setting up a stabilized full-flap approach at the recommended short field approach speed for your airplane. This speed is generally slower than that used on normal approaches and the descent will be steeper than usual, thanks to the lower groundspeed. Once obstacles have been cleared and landing is assured, reduce power to idle and continue to descend at the minimum recommended speed until ready to flare. If your airspeed gets too slow, lower your nose. If you are too low and in danger of not making it to the runway, add some power. Once you are very close to the ground, flare as usual to land main gear first. After touchdown, retract flaps while applying maximum braking. By retracting the flaps, the load is more rapidly transferred from the wings to the wheels, thereby allowing you to brake harder without skidding. Do not allow the wheels to lock up. Bring the airplane to a full stop before exiting the runway.

Because of the greater sink rate associated with short field landings, the touchown is firmer than for soft field or normal landings. As long as the touchdown is main gear first and there is no bounce, it's acceptable for it to be a bit firm. In windy conditions, it may be appropriate to use a higher approach speed and, under gusty conditions, some pilots prefer to use less than full flaps.

No-Flap Landing

For some pilots, typically those flying old tail draggers, every landing is a no-flap landing. However, even those of us lucky enough to fly airplanes equipped with flaps should learn how to land without using them. In an airplane such as the Cessna 152, a loss of electrical power will prevent you from using the flaps. Also, electric motors that power the flaps sometimes will malfuction.

No-flap landings start with a stabilized approach at the recommended speed for your airplane. Typically, this will be 5-10 knots faster than that used with flaps. In the absence of flaps, your stall speed will be higher, hence the need for a higher final approach speed. Once obstacle clearance and landing is assured, reduce power to idle and flare to touch down as usual.

Because of the higher approach speed, you will use more runway than normal. If you allow your speed to get too fast, you will find your airplane "floating" as you flare, and you could use up a lot of extra runway.

If you find yourself high on final or need to fly a steeper approach to clear obstacles without flaps you can use a forward slip to steepen your descent.

Forward Slip to a Landing

Forward Slip to a Landing practical test standards

A forward slip is a way of creating extra drag in the absence of flaps as a means of achieving a steeper descent. Forward slips are done with the power at idle. The purpose of the slip is to increase the rate of descent;therefore, to have power applied at the same time would be counterproductive. A forward slip is a descent with one wing lowered using aileron and the longitudinal axis of the airplane yawed at an angle to the flight path using opposite rudder. To initiate a forward slip on final approach, lower one wing using aileron and yaw the longitudinal axis of the airplane in the opposite direction using rudder. If there is crosswind, lower the wing on the side from which the wind is coming. Yaw the nose in the opposite direction to the bank just enough to maintain the desired ground track.

Be attentive to your angle of attack/airspeed while slipping. This is a cross-control maneuver, so it is important to avoid getting too slow or too close to the critical angle of attack. A stall from a slip at final approach altitude would probably develop into an unrecoverable spin.

Because the pitot tube and static ports will not be correctly aligned with the airflow during the slip, you cannot depend on accurate airspeed indications in this configuration. So, be particularly attentive to other indications of getting too slow, such as mushy controls or buffeting. If you get too close to a potential stall speed, lower the nose to increase airspeed and reduce the angle of attack.

Prior to touchdown, it will be necessary to realign the longitudinal axis of the airplane with the runaway centerine. To straighten out prior to flaring, level the wings and release rudder pressure simultaneously to align the longitudinal axis of the airplane with the centerine and then flare to touch down as normal.

Slips are also used in crosswind landings, in which cases a†sideslip can be used to create a sideways force that is equal to and opposite to the force of the wind drift.

Crosswind Approach and Landing

Crosswind Approach and Landing practical test standards

To land when the wind is not aligned with the runway requires a technique for overcoming the sideways drift that the wind tends to induce. On final approach, this wind drift can be counteracted by either a crab or sideslip. A crab simply entails selecting a heading towards the direction the wind is coming from while flying wings level. The Wind Correction Angle selected should be enough to prevent drift and maintain a straight ground track along the extended centerline. Adjust the Wind Correction Angle as necessary to achieve zero drift. If you fly your final approach with a crab, it will be necessary to align the longitudinal axis of the airplane with the runway prior to touchdown. This alignment needs to be made just prior to touchdown. It requires precise timing to avoid drifting if the crab is terminated too soon or landing out of alignment with the center line if you leave it too late. The landing gear is not designed to handle side loads, so it is very important that the airplane be longitudinally aligned with the centerline and not drifting on touchdown.

The alternative to the crabbed approach and last minute correction is to use a sideslip to counteract wind drift. This can be done for the whole final approach or just for the last part after starting out using a crab. The idea is to lower the wing on the side from which the wind is coming, using aileron to counteract wind drift, and to use opposite rudder to maintain longitudinal alignment with the centerline. The extent to which the wing is lowered will depend on the force of the wind. If you get to the point where to counteract wind drift you need to lower the upwind wing so much that full opposite rudder is insufficient to maintain alignment with the runway, it means the wind is too strong for a safe landing and you should select an alternate runway with less crosswind.

During the flare, you need to maintain wing low crosswind correction to avoid drifting and, in strong crosswinds, this means the main wheel on the side of the airplane from which the wind is coming (upwind) will touch down momentarily before the other wheel does. Once on the ground, be sure to follow through with control inputs to counteract the wind. That is, position the control wheel as if turning the airplane into the wind, using full deflection of the ailerons. At slower speeds, it takes bigger deflections of the control surfaces to have an effect. Use the rudder to maintain directional control during the rollout.

Crosswind landings are challenging, and it will take considerable practice to master these techniques. During your solo training, you can expect your instructor to place limitations on your solo privileges based on a maximum crosswind component.

Better to use your superior judgment to select a runway aligned with the wind than to count on using superior skill to land in a strong crosswind.

After developing skill with these advanced takeoff and landing techniques, your next challenge is to learn about cross-country flying. Flight Eight will introduce pilotage, dead reckoning, weather briefings and in-flight communications with flight service stations.


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