Airframe & Systems Tutorial - PPSC

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A trimming tailplane is a horizontal stabiliser with variable incidence, adjusted to trim the aircraft longitudinally so that aircraft attitude can be maintained with minimal stick force. Trim tabs are attached to the primary control surfaces and adjusted to elminate the stick force needed to hold a given control position. Chapter 1 Page 52 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems 100. The mode of actuation of the secondary control surfaces may be direct mechanical, hydraulic or electric powered, or fly-by-wire, depending upon the aircraft size and operating speed.

Safe-Life 62. This original design philosophy involved testing to failure and to allocate the structure, a safe life of 25% of the average life when tested to destructive failure. Chapter 1 Page 32 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems Fail-Safe 63. In this construction, components were designed to accept the loads of adjacent components should one of the latter fail. The philosophy anticipated failure. However, precise inspection techniques were not specified, and there were, for example, no studies of crack growth.

The balance tab imposes a small penalty in terms of drag, and diminishes slightly the effectiveness of the primary control surface to which it is fitted. Chapter 1 Page 40 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems FIGURE 1-24 Balance Tab Chapter 1 Page 41 © G LONGHURST 1999 All Rights Reserved Worldwide Airframe and Systems Anti-balance Tab 81. In some aircraft, far from requiring assistance in moving a control surface against the aerodynamic loads, the hinge moment is too small.

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