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time.
deviate deviate /diviet/ verb to move away
from the normal position or path
If the
aircraft deviates beyond the normal ILS
glide slope, the flight crew are alerted.
deviation deviation /divi|eʃ(ə)n/ noun 1. the
process of moving away from the normal
position or path
On final
approach, any deviation from the
extended centreline of the runway
should be corrected immediately. 2. a
magnetic compass error in a particular
aircraft caused by magnetic influences
in the structure and equipment of the
aircraft itself
Deviation is not a constant
value but varies from one aircraft
to another.
device device /d|vas/ noun an object, especially
mechanical or electrical, which
has been made for a particular purpose

A capacitor is a device with the ability
to temporarily store an electric charge.
71 diffusion
dew dew /dju/ noun drops of condensed
moisture left on the ground overnight in
cool places
dew point dew point /dju pɔnt/ noun the
temperature at which air is saturated
with water vapour and condensation
begins
COMMENT: Weather reports usually
include the air temperature and dew
point temperature. When the
difference between temperature and
dew point is small, there is a strong
possibility of fog, clouds, or
precipitation.
DFDF abbreviation direction finding
DFDR DFDR abbreviation digital flight data
recorder
DFR DFR abbreviation departure flow regulation
DFTI DFTI abbreviation Distance from
touchdown indicator
DHDH abbreviation decision height
DIDI abbreviation direction indicator
diagonal diagonal /da|$ən(ə)l/ adjective 1.
joining two opposite corners of a rectangle
2. sloping halfway between the
vertical and horizontal
Early aircraft
were of the wire braced type of construction,
the wire being superseded by
tubular diagonal struts.  noun a line
joining two opposite corners of a rectangle
diagram diagram /daə$rm/ noun an often
simplified drawing showing the structure
or workings of something
The
diagram shows a simple open-circuit
system.
diagrammatic diagrammatic /daə$rə|mtk/
adjective referring to something which
is shown as a drawing of a system or
structure  diagrammatic format in
the form of a diagram
dial dial /daəl/ noun the face of an instrument
showing a scale
A cup anemometer
is connected to an instrument with
a dial showing wind speed in knots.
diameter diameter /da|mtə/ noun the distance
from one side of a circle to the
other, passing through the centre 
equatorial diameter the distance from
the equator, through the centre of the
Earth to the equator on the opposite side
of the globe
diaphragm diaphragm /daəfrm/ noun a thin
sheet of material used to separate parts
or chambers
Some switches are operated
by a diaphragm which flexes under
fluid or air pressure.
differ differ /dfə/ verb to be unlike
Track
and heading differ by the amount of
drift.
Because the chart time and the
departure/arrival times differ, it is necessary
to consider the movement of any
weather system which might affect the
route.
differential differential /dfə|renʃəl/ adjective
referring to things which react differently
when measured against a norm or
standard  differential heating of the
atmosphere the heating of the atmosphere
to varying temperatures depending
on the relative warmth of the land at
the equator and the poles
differential expansion switch differential expansion switch
/dfərenʃəl k|spnʃ(ə)n swtʃ/
noun a switch which operates on the
principle that the coefficients of expansion
of dissimilar metals are different
differentiate differentiate /dfə|renʃiet/ verb to
recognise the difference between two
things; to show two things to be different

Some types of colour blindness
make the sufferer unable to differentiate
between blue and red.
diffraction diffraction /d|frkʃ(ə)n/ noun the
breaking down of a beam of radiation

Diffraction produces a surface wave
which follows the curvature of the
earth.
diffuse diffuse /d|fjus/ adjective spread out
in every direction
Glare caused by diffuse
reflection of sunlight from the top
　
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