Instruments   Safe, economical, and reliable operation of modern airplanes is dependent upon the use of instruments. Instrumentation is basically the science of measurement. Speed, distance, altitude, attitude, direction, temperature, pressure, and engine revolutions are measured and these measurements are displayed on instrument dials in the airplane's cockpit. There are those which are referred to as "flight instruments" and others are termed "engine instruments." Only the basic instruments found in typical general aviation airplanes are discussed here (Fig. 2-19).   FAATest.com - Aviation Library Dauntless Software hosts and maintains this library as a service to pilots and aspiring pilots worldwide. Click here for ways to show your appreciation for this service. While much of this material comes from the FAA, parts of it are (c) Dauntless Software, all rights reserved. Webmasters: please do not link directly to individual books in this library--rather, please link to our main web page at www.dauntless-soft.com or www.faatest.com. Thanks!