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noun an unexpected landing that a pilot
of an aircraft has to make because of an
emergency situation
force down force down /fɔs daυn/ verb to
force an aircraft to land, usually
because of an emergency situation
force-land force-land /fɔs lnd/ verb to land
an aircraft before it gets to its destination
because of an emergency situation,
or land in these circumstances
of flight forces of flight /fɔsz əv flat/
plural noun the aerodynamic forces, lift,
drag, weight and thrust, which act on an
object that is travelling though the air
fore /fɔ/ adjective located at or
towards the front  the fore and aft axis
of the aircraft the longitudinal axis of
the aircraft  to come to the fore to
become important or to start to play a
leading role
The jet engine came to
the fore in the late forties.
aft
forecast /fɔkɑst/ noun a statement
of what is likely to happen in the future
or describing expected events or conditions

weather forecast  forecast
weather charts charts with information
about the weather coming to a particular
area  verb to estimate or calculate
weather conditions by studying meteorological
information
Rain is forecast
for this afternoon. (NOTE: forecasting –
forecast or forecasted)
chart forecast chart /fɔkɑst tʃɑt/
noun same as prognostic chart

Prognostic or forecast charts are prepared,
by the central meteorological
office of each region, normally for periods
up to 24 hours ahead.
form form /fɔm/ noun 1. a document with
blanks for the insertion of details or
information
insurance form
application
form 2. a kind or type
The
ground automatic relief valve is a form
of discharge valve.
Drizzle is the
lightest form of precipitation. 3. the
shape of an object
Fluids take on the
form of the container in which they are
found.  in the form of a triangle in the
shape of a triangle 4. the way in which
a thing exists, acts, or shows itself

water in the form of ice
fuel in the
form of a spray  verb 1. to come into
being
In some conditions, ice forms
on the leading edge of the wing.

Cumulus clouds only form in an unstable
atmosphere. 2. to make a shape

Three points on the chart form a triangle.
3. to make up or constitute
The
101 front
classroom and accommodation building
form the main part of the college.
formation formation /fɔ|meʃ(ə)n/ noun 1. the
process of coming into being or forming
 cloud formation the natural production
and development of clouds 
ice formation the natural production
and development of ice 2.  to fly in
formation to fly in a group which
maintains a particular pattern or
arrangement in the air
former former /fɔmə/ adjective having been
in the past  a former military pilot a
pilot who used to be a military pilot 
noun 1. the first of two things mentioned
2. a light secondary structure of
the airframe which gives improved
shape
‘…much has changed in the former
Eastern European States, especially in
terms of aviation operations and training’
[Civil Aviation Training]
formula formula /fɔmjυlə/ noun a mathematical
rule expressed in symbols
The
formula for calculating speed is D ÷ T
= S (where D = distance, T = time and
S = speed). (NOTE: The plural form is
formulas or formulae.)
forward forward /fɔwəd/ adjective at, near,
or belonging to the front
the forward
section of the aircraft
forward and aft
exits
forwards forwards /fɔwədz/ adverb towards
a position in front
The throttles are
moved forwards for take-off. (NOTE: The
US English is forward.)
fouling fouling /faυlŋ/ noun contamination
of the spark plugs with oil or petrol so
that they do not fire correctly
The
engine should be run at a positive idling
speed to prevent spark plug fouling.
four-digit group four-digit group /fɔ dd"t
$rup/ noun four single numbers found
together
four-stroke combustion engine four-stroke combustion engine
/fɔ strəυk kəm|bstʃ(ə)n end"n/
noun an engine which operates in
accordance with the four-stroke cycle

Induction, compression, power and
exhaust are the four phases of the fourstroke
combustion engine.
fpm fpm abbreviation feet per minute
　
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