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initial contact frequency
initial contact frequency That used for ATC communication
as aircraft enters new sector of controlled airspace.
initial defensive operations The initial deployment of an
ABM system (MDA/White House).
initial heading That at start of rating period while using
astro-gyro control (ASCC).
initial mass 1 That of rocket or rocket vehicle at launch.
2 That of fissile or other nuclear material before reaction.
initial operational capability Time at which particular
hardware (eg weapon system) can first be employed effectively
by trained and supported troops (USAF).
Particular parts of the system may still be lacking.
initial point 1 Well defined fixed surface feature usable
visually and/or electronically as starting point for attack
on surface target (most existing definitions state ‘starting
point for bomb run’.)
2 Similar surface point where aircraft make final
correction of course to pass over drop zone or other
surface target.
3 Air-control point near landing zone from which helicopters
are directed to landing sites.
4 First point at which moving target is located on plotting
board or display system.
initial radiation That emitted from fireball within 60 s of
nuclear burst, mainly neutrons and gamma rays.
initial surface That at start of solid-rocket burn; its area.
initial surface/throat area Fundamental nondimensional
characteristic of solid motor.
initial throat area Cross-section area of unused solidmotor
throat.
initial-value problem One which, from given state, determines
state of dynamic system at any future time.
initiation 1 Starting sequences leading to nuclear
explosion.
2 Birth of new inbound track on air-defence system.
initiation phase In autoland, 10 nm from threshold,
2,500 ft (usually 205 kt, 15° flap).
initiator 1 Person assigned to initiate tracks in airdefence
system.
2 Starts automated sequence in modern crew ejection.
INL/A International Narcotics and Law Enforcement
Affairs, office of Aviation (Int.).
INJ Injection.
injection Insertion of satellite into orbit, or spacecraft on
to desired trajectory.
injection carburettor One delivering metred flow to
nozzle in induction system, usually without venturi and
with insensitivity to flight attitude.
injection flow Primary flow in ejector pump or induced
augmenter.
injection point That at which satellite enters orbit.
injection pressure Pressure in system between turbopump
and injector.
injection pump 1 Ejector.
2 Injection carburettor.
3 More usually, multi-plunger pump in direct-injection
engine.
injection velocity That at injection point.
injector Point at which one or both propellants in liquid
rocket enters chamber (usually many are used, distributed
around chamber).
ink Verb, to sign a formal contract (US, colloq.).
inph
INL/A International Narcotics and Law Enforcement
Affairs, office of Aviation (Int.).
inlet Usually air intake at upstream end of air-breathing
system.
inlet blocker Fixed or movable screen inside inlet duct[s]
to engine[s] of combat aircraft to prevent hostile radar
seeing front of engine.
inlet distortion 1 Departure from ideal airflow through
inlet, esp. in yawed or turbulent conditions.
2 Plot of flow velocities across plane normal to axis of
air-breathing engine, eg at entry to fan, entry to
combustor or entry to turbine.
inlet duct Air passage linking inlet (intake) to engine.
inlet guide vane Fixed or variable-incidence stators
preceding compressor rotor or turbine.
inlet mass flow function Corrected value for airflow
through a gas-turbine engine, WT/P.
inlet particle separator Dynamic (usually centrifugal)
device that removes solid particles from airflow entering
engine.
inlet unstart Sudden gross disruption of airflow through
supersonic engine inlet causing near-total loss of thrust;
hard-to-cure hazard at Mach 3 and above (see unstart).
inline engine 1 Piston engine with all cylinders in single
linear row; loosely (probably incorrectly) applied to
engines with two or more rows such as the vee or opposed
configurations.
2 Turbojet and ramjet mounted in tandem, sharing
same airflow (usually with variable-geometry ducting).
INM Integrated noise model; rv adds research version.
Inmarsat International Maritime Satellite Organization
[office, London EC1Y].
INMG Instituto Nacional de Meteo e Geofisica
(Portugal).
InN Indium nitride.
inner Applied to aeroplane, = closer to centreline.
inner horizontal surface Specified portion of local horizontal
plane located above airfield and immediate
surroundings.
inner loop Control loop via pilot, not autopilot.
inner marker ILS marker rarely installed near threshold,
3,000 Hz dots and white panel light.
inner mould line Low-cost technique for compositestructure
tooling.
inner planets Four nearest Sun: Mercury, Venus, Earth,
Mars.
inner space Within Solar System.
inner wing 1 Loosely, inboard part.
2 That on the inside of a turn, usually with reduced
airspeed.
innovative controls Many forms, e.g. replacing rudder
and ailerons by rotating wingtips or slot/spoilers.
INO Indian Ocean region (ICAO).
IN100 HPT material, high-Ni alloy, 1975.
INOP, Inop Inoperative.
inoperative Deliberately taken out of use (thus not a
failed engine or other device).
I-NOSC Integrated network operations and security
center (USAF).
INP If not possible.
InP Indium phosphide, semiconductor.
INPE Instituto de Pesquisas Espaciais [space research,
São José dos Campos] (Brazil).
inph Interphone.
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