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With power-assisted controls, the force needed for movement of the control surface is provided partly by the physical force produced by the pilot and partly by the power system. Here then the pilot will have ‘feel’ which is provided by the control surface loads. Should a fault or power failure occur in the control system, a disconnect system will be available, and control will continue to be maintained by manual means alone, although control loading will be relatively high. Trim control for a power-assisted control is provided in the same way as that for manually operated flying controls.

Chapter 1 Page 45 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems FIGURE 1-27 Servo Tab Chapter 1 Page 46 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems Powered Controls 85. The force needed to move the control surfaces of a large aircraft flying at high speeds makes it virtually impossible for satisfactory control to be exercised by manual controls. It is therefore necessary that the primary control surfaces be power operated. 86. Powered controls may be divided into two categories, power-assisted controls and fully power operated controls.

The landing gear of a fixed wing aircraft supports the weight of the aircraft while it is on the ground and is made up of the main and auxiliary landing gear. The main gear provides the principal support. The auxiliary gear is in the form of a nose or tail wheel installation, almost invariably the former, especially in large aircraft. 2. The advantages of tricycle landing gear during ground operation are: (i) No risk of the aircraft ‘nosing over’ during hard braking. (ii) Better visibility for the pilot during taxiing.

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Airframe & Systems Tutorial - PPSC

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