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IMT
IMT 1 International mobile telecommunications.
2 Immediate[ly].
IMTA Intensive military training area.
IMTS Integrated maintenance training system.
IMU Inertial measurement unit.
IN 1 Inertial navigator (or navigation).
2 Instrument navigator (arch.).
in 1 Inch, inches.
2 When applied to airbrakes, usually means retracted,
not in use.
INA 1 International Navigation Association Inc.
[office, Arlington, VA 22202-0324] (Int.).
2 Initial approach.
INACP Integrated navigation-aids control panel.
inactivate Of military unit, withdraw all personnel and
transfer to inactive list.
InAF Indian Air Force [UK usage].
INAS Integrated, or inertial, navigation/attack system.
InAs Indium arsenide.
InAsSb Indium antimony arsenide.
INB Iron-neodymium-boron magnetic alloy.
INBD, inbd 1 Inbound.
2 Inboard.
inboard aileron Aileron situated on inner wing between,
or in place of, flaps.
inboard profile Side-elevation drawing showing internal
systems and equipment, sometimes as true section along
centreline.
inboard quadrant Inner selectable position of power
(throttle) lever on left side of cockpit giving operative
afterburner.
inbound Approaching destination, thus * traffic, *
controller etc.
inbound bearing Normally QDM, not QDR or VOR
radial.
INC 1 Insertable nuclear component.
2 Interchangeability code.
3 In cloud.
4 Increase, increasing.
5 Information network computing.
Inc Incorporated (US company).
Inca 1 Intelligent correlation agent (data fusion).
2 Integrated nuclear communications assessment.
3 Initiative en combustion avancée, future engines (F).
Incans Interference cancellation system.
Incas Integrated navigation and collision-avoidance
system.
INCD Integrated navigation cockpit display.
incendiary bomb Bomb designed to ignite enemy infrastructures.
inceptor Cockpit control forming interface between
pilot and major change in trajectory, eg stick/yoke,
throttle, pedal, cyclic, collective or nozzle angle lever.
Incerfa, INCERFA Code: phase of uncertainty (ICAO).
inch 1 To command powered actuator in rapid succession
of small cycles to achieve target condition.
2 Non-SI unit of length, = 25.4 mm exactly.
inches Traditional US measure of piston engine manifold
pressure, = * Hg (mercury), see next.
In Hg Non-SI unit of pressure, = (at 0°C] 3.38639 10 –3
Nm –2 .
incidence 1 Angle between chord of wing at centreline
and OX axis.
independent
2 Generally, the angular setting of any aerofoil or other
plate-like surface to a reference axis.
3 Widely and incorrectly used to mean angle of attack.
incidence instability Divergent aerofoil load caused by
wing flexure simultaneously resulting in increased
incidence.
incidence wires Diagonal bracing wires in plane of
biplane interplane struts.
incident report Normal report of incident; this falls short
of an accident, takes place on ground or in air during
flying operations, and usually stems from human error.
incl Inconclusive, include[d].
inclination Angle between isobar and wind or airflow at
given point.
inclined shock Shockwave generated by body in airflow
at Mach number significantly greater than 1, with angle
such as to turn flow parallel to surface of body; in airbreathing
inlet generated by centrebody or sharp-edged
plate and focused on lip.
inclinometer Instrument for measuring inclination;
many forms, one being spirit level on pivoted arm [end of
arm shows degrees on protractor while slight curvature of
sliding spirit level gives minutes]. Some authorities call
this a clinometer, which see.
included angle That between longitudinal axis of body
and free-stream vector.
incoherent backscatter[ing] Random backscatter of a
signal by individual electrons in the ionosphere.
Incomap Family of mechanically alloyed Al alloys, esp.
Al-Mg-Li-C-O.
Inconel High-nickel chromium-iron refractory alloys
(Int. Nickel and Mond).
Incos Integrated control system [Hartman ASW].
Incose International Council on Systems Engineering
(Int.).
Incospar Indian National Committe for Space
Research.
Incr Increase.
incremental airbrakes Capable of being controlled to
intermediate positions.
incremental ejection Dispensing chaff in discrete
bundles.
incremental sensitivity Change in received signal per unit
displacement of ILS receiver from mean glidescope.
INCRSG Increasing.
incumbent Airline long established in the market [cf,
entrant].
incursion 1 Conflict, especially between two aircraft, on
runway or elsewhere on airfield [FAA adds ‘with active
control tower’].
2 Any entry by aircraft into forbidden area, either on
ground or in flight.
Ind Indicator (for wind or landing direction).
INDAE Instituto Nacional de Derecho Aeronutica y
Espacial (Argentina).
indefinite callsign C/s assigned to individual units/facilities
etc and to large groupings.
INDEFLY Indefinitely.
independence One meaning is Busemann’s principle that
aerodynamic forces on a wing of high aspect ratio are
independent of any V component in the spanwise direction.
independent 1 Military unit with complete authority
over tasking [e.g. UK * Air Force 1918].
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