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Most modern aircraft with tricycle (nose-wheel) layouts are equipped with nose-wheel steering for ground manoeuvring, some very large aircraft also have main wheel steering (known as body steering). In aircraft designed for flight at high speeds/altitudes the landing gear is retracted into the fuselage or wings in flight, to reduce profile drag. In low performance aircraft this is less important and the landing gear is often fixed in the extended configuration. Chapter 2 Page 1 © G LONGHURST 1999 All Rights Reserved Worldwide Landing Gear Systems Main Components of Landing Gear 4.

An inset hinge is illustrated at Figure 1-21. FIGURE 1-21 Inset Hinge Chapter 1 Page 37 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems Horn Balance 78. An example of a horn balance is shown at Figure 1-22. Although it is shown here on a rudder, horn balances can equally well be used on ailerons or elevators. In this system a portion of the control surface acts ahead of the hinge line, and therefore produces a moment in opposition to the hinge moment. FIGURE 1-22 Horn Balance Chapter 1 Page 38 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems Internal Balance 79.

These can be either external mechanical locking devices to prevent control surface movement, usually fitted to aircraft with manual controls, or internal hydraulic locks incorporated with powered flying controls. Visual warning that such locks have been fitted are provided externally at the control surface and in the cockpit at the operating control. On some aircraft, warning lights indicate when control surface locks are in place. Secondary Controls 97. The principal function of the secondary control surfaces is not to provide control about one of the primary axes, but to adjust the lift or trim in specific flight circumstances.

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Airframe & Systems Tutorial - PPSC

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