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inert round
inert gas, usually nitrogen [USSR in WW2 used cooled
engine exhaust, which contains oxygen].
inert round Missile or ammunition partly or entirely
dummy, and lacking propulsion.
INES IUE newly extracted spectra.
INET Inertial navigation equipment tester.
INEWS, Inews Integrated electronic-warfare system [or
suite].
INF 1 Intermediate-range nuclear force(s).
2 Infantry.
infant mortality Failure at start of life-cycle.
Infco Standing Committee for Science and Technology
Information (ISO).
inferior planet Planet with orbit inside that of Earth.
infiltration Manufacturing stage with FRM (fibrereinforced
metal) components in which molten metal is
used to fill gaps between compressed metal-coated fibres.
infinite aspect ratio Many aerofoil calculations ignore
effects at the ends (tips) and accordingly are true only for
a wing of infinite aspect ratio (ie, it goes on forever or
touches both walls of tunnel).
infinity Symbol ∞, used as subscript to denote freestream
values.
Infis Inertial-navigation flight inspection system.
inflatable aircraft One whose airframe is of flexible
fabric, stabilized by internal gas pressure. Term usually
applied to aerodynes.
inflatable de-icer One whose action is the repeated inflation
and deflation of a flexible surface, thus breaking off
accreted ice.
inflation manifold Links several sources of gas to gasfilled
aerostat.
inflation sleeve Large thin-wall tube to which inflation
manifold is connected.
inflator Trolley-mounted powered fan to begin inflation
of hot-air balloon.
inflection Point at which curve reverses direction.
in-flight advisory Sigmet/airmet broadcast to enroute
pilots notifying conditions not anticipated at preflight
briefing.
in-flight weight Maximum authorized weight after inflight
refuelling, can exceed MTOW.
inflow 1 The component of velocity through a helicopter
main rotor normal to the tip-path plane.
2 There are two more [rare and confusing] meanings:
increase in relative speed as air is sucked into a propeller;
and inwards radial velocity as air is sucked into a
propeller.
inflow ratio Ratio of rotorcraft TAS and peripheral
velocity rω at tips of blades.
influence line Graphical plot of shear, bending moment
and other variables as point load moves along structure.
Info Information frame.
informatics Word gaining some ground in English from
transliteration “informatique” (F) = EDP (1).
information dominance Being quicker than the enemy in
assessing combat situation and launching weapons.
information operations Central method of waging war,
including EW, psyops, comint and defence against cyber
attack.
information pulses Those repeated parts of the transmission
in SSR or IFF that convey information (eg
identity, flight level).
initial attack
information technology management The ground-based
portion of an ADMS.
Infosec Information security.
Infowar Information warfare.
Infraero Airports authority (Brazil).
infra-red, IR Portion of EM spectrum with wavelength
longer than deep red light, thus not visible, but sensed as
heat. Near * wavelengths 0.75–1.5µ, intermediate *
1.5–20µ, far * 20–1,000µ.
infrasound Sound, especially at very high power, at very
low frequency [