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inverse-square law
inverse-square law States point-source radiation and
most other emissions fall off in intensity as square of
distance from emitter.
inverse synthetic-aperture radar Use of SAR/DBS technique
but using a fixed (or moving) radar to integrate
successive echoes from a moving target.
inversion Local region of atmosphere where lapse rates
are negative, ie temperature increases with height.
inversion point Height at which inversion ceases and
normal lapse rate begins.
inverted bipolar Inverted gate.
inverted engine Piston engine with crankshaft above
cylinders.
inverted-flight valve Commonest form is fitted in
delivery from fuel tank to maintain feed under negative-g.
inverted gate Bipolar with emitter downwards.
inverted gull wing Seen in front elevation, slopes down
from body with pronounced anhedral and then (suddenly
or gradually) slopes up with dihedral to tip.
inverted loop See next two entries. BS: “A complete
revolution in flight in a vertical plane about lateral axis
with upper surface on outside of curved flight path.”
Some insist * must be started with aircraft inverted, thus
from bottom of manoeuvre.
inverted normal loop Normal loop begun from inverted
position.
inverted outside loop See bunt.
inverted spin Spin in inverted position. Strangely, BS
definition is: “A spin with negative mean angle of incidence”
[AOA is meant].
inverted vee-engine Two inclined banks of cylinders
below crankshaft.
inverter Electrical machine or static rectifier that inverts
polarity of each alternate AC sine wave to give DC
output.
investment casting Casting complex shapes in ceramic
moulds formed as coatings on wax patterns which are
then melted and run out, hence term lost-wax casting.
investment prediction Assessment of required inventory
of spares and GSE.
INVH Integrated night-vision helmet.
inviscid Without viscosity.
invocon Innovative concepts in systems engineering.
INVOF In the vicinity of.
involuntary boarding refusal Passenger denied access to
aircraft, for whatever reason.
involuntary retirement Of aircraft, caused solely by
legislation, esp. environmental non-compliance.
INVR Institute of Noise and Vibration Research (UK).
INVRN Inversion [weather].
inwales Longitudinal members at junction of flyingboat
topsides and deck. Often = gunwales.
inward relief valve One-way valve in fluid system triggered
by abnormally low local pressure in container.
in-weather Flying in conditions that are wet and/or icy,
but not poor visibility (USAF).
In-WX In weather.
IO 1 Identification officer (air-defence systems).
2 Direct-injection, opposed cylinders (US piston
engines).
3 Image orthicon.
4 Information officer (US).
5 Information operations (US).
6 Integrated optics.
IOR
I/O Input/output; C adds computer.
Io Mean spherical candle power.
IOA 1 Initial operational assessment.
2 International Omega Association (office, Arlington,
VA).
IoA Institute of Acoustics.
IOAT Indicated outside air temperature.
IOB International Operations Bulletin.
IOBP Imagery on-board processor.
I-obs Index of crew and maintenance observations.
IOC 1 International Oceanographic Commission
(UN).
2 Initial operational [or operating] capability [or
clearance].
3 Indirect operating cost.
4 International order of characters.
I/OC Input/output concentrator, or controller.
I/OCE Input/output control element.
IOCU International Organization of Consumers’
Unions.
IOD 1 Inflight-opening doors (Stovl engine).
2 Internal- [as distinct from foreign] object damage.
iodine Shiny black solid element, symbol I, density 4.9,
sublimes to purple vapour, see silver iodide.
IOE 1 Initial operating experience.
2 In-orbit experience.
IOFP Intensive operational flying programme.
IOI Item of interest/importance.
IOIC Integrated operations intelligence center, or
communications (USN).
IOIS Integrated operational intelligence system.
IOL Society of Austrian aeronautics companies [office,
Vienna].
IOM Input/output module.
I-omega, Iω Angular momentum.
ION The Institute of Navigation [office, Alexandria,
VA22314] (US).
ion Electrically charged atom or group of atoms; can be
in solid or solution or free; charge can be positive (missing
electron) or negative (usually through extra electron).
IONDS Integrated operational nuclear detection
system.
ionic propulsion See ion rocket.
ionization Conversion of atoms to ions.
ionization potential Work measured in eV necessary to
remove or add electron in ionization.
ionization screen Barrier to charged particles which
would otherwise damage human tissue.
ionogram Plot of radio frequency against pulse roundtrip
time, ie electron density level for reflection (approx.
equal to altitude of reflective layers).
ionopause Ill-defined base of ionosphere; also known as
D-region.
ionosphere Entire ionized region of Earth’s atmosphere
(Kennelly-Heaviside, Appleton, E and F layers). Not Van
Allen Belts.
ion rocket Propulsor, usually small thruster, generating
high-velocity jet of ions in electrostatic field.
IOP 1 Institute of Petroleum.
2 Information operations planning [S adds system].
3 Independent overspeed protection.
I/OP Input/output processor.
IOR 1 Indian Oceanic Region.
2 Immediate operational requirement.
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