Using a Navigation Computer, solve triangle of velocity problems (given four of the six variables):
a) Heading and Track (2);
b) TAS and GS (2kts);
c) Wind Velocity (3/ 3kts);
d) Drift (1);
To calculate the above informationon a flight computer, we use the wind side which enables us to input known information, and calculate unknown information.
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The process of using the Flight Computer is explained in a previous chapter
Define:
a) Sunrise;
b) Sunset;
c) Daylight;
d) Twilight;
e) Morning civil twilight (MCT);
f) Evening civil twilight (ECT).
Sunrise is the precise time the upper edge of the sun appears over the visible horizon.
Sunset is the precise time the upper edge of the sun disappears below the visible horizon.
Daylight is the time between the beginning of MCT (morning civil twilight and the end of ECT (evening civil twilight. Daylight is made up of the hours of morning twilight, sunlight and evening twilight.
Twilight is when the sun is below the visible horizon, but there is a glow in the sky caused by the reflection of the sun’s rays from the atmosphere.
MCT (morning civil twilight) begins when the centre of the rising sun’s disc, is 6 degrees below the sensible horizon.
ECT (evening civil twilight) ends when the centre of the setting sun’s disc is 6 degrees below the sensible horizon.
A position line is defined as a line which an aircraft is known to be on at a particular time.
Position lines can be obtained from physical features such as roads, railway lines or coastlines; two or more features that are positioned on the TMG (track made good) or visual relative bearings from or to features such as navigations aids.
Calibrated airspeed, is IAS corrected for pressure or position error (sometimes referred to as instrument error); which arises from the location of the static port (where we read the static pressure)
