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intercontinental ballistic missile
intercontinental ballistic missile Land-based, range over
5,500 nm (6,325 miles) (USAF).
intercooler Radiator for rejecting excess heat in enclosed
fluid system., e.g. downstream of piston-engine supercharger
intercostal Short longitudinal structural member
(stringer) joining adjacent frames or ribs, usually to
support access door or equipment.
inter-cylinder baffle See baffle.
intercrystalline corrosion Originating and propagating
between crystals of alloy.
interdiction See air interdiction, battlefield air interdiction.
interface Boundary between mating portions of system;
can be mechanical (eg inlet duct and engine) or electronic
(eg central computer and navigation display).
interference 1 Mutual interaction between solid bodies
in fluid flow, eg upper and lower biplane wings (see
Prandtl *).
2 Disruption of radio communications by unwanted
emission on same wavelength, as from unscreened
ignition.
interference drag Drag caused by aerodynamic interference.
interference factor Arbitrary drag multiplier, from 1 to
1.5, correcting for location of external bodies in proximity
to aircraft [usually to the wing].
interference fit Fit between parts where male dimension
exceeds female (several exact definitions).
interference foul Physical conflict between fixed and
moving parts, esp. between control column/wheel/yoke
and an obstruction.
interference strut Obstructs cockpit if flight controls
locked.
interferogram Display or photograph of interferometer
patterns for precise measurement or aerodynamic
research.
interferometer Optical measuring system using divided
light beam later rejoined to give phase interference seen as
light/dark fringes.
interferometer array Aerial (antenna) able to emit or
receive simultaneously at large number of accurately
related locations.
interior ballistics Branch of ballistics concerned with
bodies under propulsion.
interlacing 1 Scanning technique for raster display in
which all odd-number lines are scanned and then all even.
2 IFF technique in which pulse trains of different
modes are transmitted sequentially (to achieve enough
transponder returns per scan it is rare to interlace more
than three modes).
interline Between different air carriers, hence interlining.
intermediate approach That part of approach from
arrival at first navigational facility or pre-determined fix
to beginning of final approach.
intermediate case 1 Gas-turbine casing; several meanings,
eg between two compressor spools or over
compressor spool downstream of fan.
2 In a three-shaft engine, the case linking the IP and HP
components.
Intermediate contingency 1 Turboshaft power rating
below emergency (max. contingency) level, usually
allowed for 30 [sometimes 60] min.
international
2 Of afterburning turbofan or turbojet, usually means
maximum cold thrust.
intermediate frequency That to which signal is shifted
between its reception and transmission.
intermediate gearbox See step-aside gearbox.
intermediate maintenance At least six meanings, the
most common being maintenance performed on a military
user airbase in a specialized workshop.
intermediate-pressure Compressor/turbine spool
between LP and HP in three-shaft engine, abb. IP.
intermediate range Traditional figure for ballistic
missiles is 1,500 nm, about 1,727 miles, 2,780 km
(originally USAF).
intermediate rating Intermediate contingency.
intermediate shop Flightline fault-isolating system, esp.
for avionics, synthesising all forms of EM signal for
HUD, radar, etc.
intermetallics Compounds or alloys in which atoms of
two or more metals are arranged in complex structures in
fixed ratios. Some are semiconductors, but immediate
work is concentrated on aluminides of refractory metals.
intermittent duct Resonant air-breathing engine; also
known as intermittent jet, but more common term is
pulsejet.
intermodal Capable of use by more than one form of
transport, ideally by air, rail and truck.
internal air system All airflows and pressure differences
having no direct effect on engine thrust or power.
internal balance By control-surface area ahead of hinge
[called the shelf] fitting in vented chamber in fixed structure.
See compound shelf.
internal burning Solid propellant rocket grain whose
exposed surface is along centreline [e.g., star centred].
internal combustion Originally described prime mover
whose fuel was burned in the cylinder, unlike steam
engine; in gas turbine and nuclear era meaning is blurred.
internal combustion turbine Accepted term for gas
turbine [UK Government establishments, 1926–46].
internal efficiency Rocket thermal efficiency.
internal engineering notice Issued by manufacturer, esp.
to customers.
internal fuel Contained in aircraft or spacecraft, as
distinct from fuel in removable or jettisonable tanks.
internal gearbox In a two-shaft engine the starter must
drive the HP spool, and this normally calls for a bevel gear
inside the core. There are usually bevel gears from adjacent
ends of the LP and HP shafts from which drive is
taken to external gearbox[es].
internal lip contraction In an externally mounted
turbofan, the ratio r hl/ r th, hilite plane to throat.
internally blown flap 1 Usually, large conventional flap
through which main propulsion jet(s) or bleed air can be
ducted.
2 Rarely, jet flap.
internal power Generated in the aircraft (electrical,
hydraulic, etc).
internals 1 Items inside cockpit.
2 Frames, longerons and stringers, or spars and ribs.
internal service Air route wholly within one country.
internal starter/generator Built into centre of engine as
part of it.
internal supercharger Downstream of carburettor.
international As applied to flight, service or route, one
passing through airspace of more than one country
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