Tachometer Systems
The tachometer indicator is an instrument that shows the speed of a gas turbine engine (jet) main rotor assembly. Figure shows tachometer indicators for various types of engines. The dials…
Stall Warning System
Many aircraft have stall warning indicators to warn the pilot of an impending aerodynamic stall. In the past, stall warning indicators were of a pneumatic control type. These devices activated…
Angle-Of-Attack (AOA) Indicating System
The Angle-of-Attack (AOA) indicating system detects aircraft angle of attack from a point on the side of the fuselage. It furnishes reference information for the control and actuation of other…
Angle-Of-Attack Transmitter
Forces vary with the angle of attack. The angle of attack is the angle between the relative wind and the chord of the wing. The chord of the wing is…
Vertical Speed Indicator (VSI)
A VSI shows the rate at which an aircraft is climbing or descending. It is very important for night flying, flying through fog or clouds, or flying when the horizon…
Counter Pointer Pressure Altimeter
The purpose of the counter pointer pressure altimeter (Figure 6-8) is to show aircraft height. By studying the dial of the indicator, you can easily understand the procedure for determining…
Some important terms……
Mean Sea Level – Since about 80 percent of the earth’s surface is water, it is natural to use sea level as an altitude reference point. The pull of gravity is…
Airspeed Indicators
Readings from an airspeed indicator are used to estimate ground speed and to determine throttle settings for the most efficient flying speed. These readings also provide a basis for calculating…
Aircraft Instruments
Pitot-Static System The aircraft pitot-static system includes instruments that operate on the principle of the barometer. The system consists of a pitot tube, static air vents, and three indicators, which…
Hydraulics
Most helicopters, other than smaller piston-powered helicopters, incorporate the use of hydraulic actuators to overcome high control forces. A typical hydraulic system consists of actuators, also called servos, on each…
