Boeing was the first to introduce liquid-crystal flight displays

X. Work in pairs. Fill in the gaps with the terms given in the box. Then find information dealing with the following points:

• Purpose
• Components
• It determines
• Types of aircraft

An ___1___ indicator (ADI), also known as gyro horizon or ___2___ horizon, is an instrument used in an aircraft to inform the pilot of the ___3___ of the aircraft relative to earth. It indicates ___4___ (fore and aft tilt) and ___5___ or roll (side to side tilt) and is a primary instrument for flight in instrument meteorological conditions. Attitude indicators also have significant application under visual flight rules, though some light ___6___ do not have them installed.

Attitude indicators use ___7____ to establish an inertial platform. The gyroscope is geared to a display that has two dimensions of ___8___, simultaneously displaying pitch and bank. The ___9___ may be coloured to indicate the horizon as the division between the two coloured segments (typically blue for sky and brown for ground), and is intended to be intuitive to use. The actual bank angle is calibrated around the ___10___ of the instrument. The pitch angle is indicated by a series of calibration lines, each representing 5° or 10° of pitch.

Ex. X. 1-attitude; 2-artificial; 3-orientation; 4-pitch; 5-bank; 6-aircraft; 7-gyroscope; 8-freedom; 9-display; 10-circumference