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IFPTE
IFPTE International Federation of Professional and
Technical Engineers (Int.).
IFPZ IFPS (1) zone.
IFR 1 Instrument-flight rules.
2 In-flight repair.
3 In-flight refuelling.
4 Initial flight release (of engine).
5 Internationaler Förderkreis für Raumfahrt (G).
IFRA In-flight refuelling area, designated airspace.
IFRB International Frequency Registration Board.
Ifrep, IFREP In-flight report [reconnaissance].
IFRS International financial reporting standards.
IFRU Interference rejection unit.
IFS 1 Institut für Segelflugforschung (G).
2 Inspectorate, or Inspector, of Flight Safety (USAF,
RAF).
3 Instrument flight simulator.
4 Inner fixed structure of reverser.
5 Initial Flight Screening (USAF).
IFSA In-Flight Food Service Association [office,
Houston , TX] (US).
IFSAR, Ifsar Interferometric SAR (2) for digital terrain
[E adds elevations].
IFSD In-flight shutdown [rate].
IFSR In-flight shutdown rate [uncommon usage].
IFSS 1 International flight service station.
2 Instrumentation and flight safety system.
IFT 1 Intelligent flight trainer.
2 Integrated flight test, or training.
3 Intercept flight test (NMD).
i.f.t. Intermediate-frequency transformer.
IFTE Integrated family of test equipment.
IFTO International Federation of Tour Operators
[office, Lewes, BN7 1YE] (Int.).
IFTS Internal, or integrated, Flir [and] targeting
system.
IFTU Intensive Flying Trials Unit (UK).
IFU Interface unit.
IFURTA, Ifurta Institut de Formation Universitaire et
de Recherche du Transport Aérien [Aix-en-Provence F-
13628] (F).
IFW In-flight weight.
IG 1 Imperial gallon (sometimes I.g.).
2 Inspector-General.
3 Image generation, or generator.
Ig Grid current; hence Ig2 screen-grid current.
I g Mass moment of inertia.
IGA 1 Inner gimbal angle.
2 Informazione geotropographiche aeronautiche (I).
3 Irish Gliding Association.
4 Indium gallium arsenide.
5 Intermediate-gain antenna.
IGAA Inspection Générale de l’Armée de l’Air (F).
IGAC, Igacem Inspection Générale de l’Aviation Civile
et de la Météorologique [Paris F-75006] (F).
Igan Indium/gallium/arsenic/nitride.
IGB Integral, or intermediate, or inlet, gearbox.
IGBAD Integrated ground-based air defence.
IGC 1 International Gliding Commission.
2 Intergovernmental Conference (US/EU).
IGDS Integrated graduate development scheme.
IGE 1 In ground effect.
2 Instrument[ation] graphics environment.
IGEB Inter-agency GPS Executive Board.
IHC
IGES 1 International graphics exchange [file] standard.
2 Interim ground Earth station.
IGFET Insulated-gate field-effect transistor.
IGI Instrument Ground-Instructor.
IGIA Interagency Group on International Aviation
[from 1960].
igloo 1 Air cargo container in form of rigid box sized for
above-floor loading.
2 Small pressurized experiment container designed for
use with Spacelab orbital laboratory.
IGN Ignition.
igniter Pyrotechnic (rocket) or high-energy discharge
device for starting combustion of solid or liquid fuel.
igniter plug Electric device producing intense flashover
for starting combustion of gas-turbine engine. Most
common types are surface discharge, shunted surface
discharge, and air-gap.
ignition delay time Several definitions for elapsed period
between ignition signal and stable or other desired
combustion in piston engine, solid rocket etc. For solid
motors, the elapsed time from ignition firing voltage to
chamber pressure reaching 10% of maximum value,
symbol t d .
ignition harness Complete screened assembly of h.t.
cables serving spark plugs of piston engine.
ignition interference Disturbance to radio communication
caused by faulty ignition screening.
ignition loop Plot of gas-turbine combustion stability on
axes air/fuel ratio and air mass flow.
ignition screening Surrounding layer of conductive braid
to prevent signal emission from h.t. harness.
ignition servo unit Automatically controls ignition
timing.
IGO 1 Prefix, US piston engine, direct injection, geared,
opposed.
2 Inter-governmental organization[s].
IGOR Intercept ground optical recorder; long-focallength
tele-camera.
IGOS Integrated Global Observing Strategy, or System
(Int.).
IGPM Imperial gallons per minute.
IGS 1 Internal gun system.
2 Instrument guidance system.
IGSO IGO plus supercharged.
IGT Industrial gas turbine.
IGTI International Gas Turbine Institute [ASME,
office, Atlanta, GA 30328] (Int.).
Ig2 Screen-grid current.
IGV Inlet guide vane[s].
IGW Increased gross weight.
IGY International Geophysical Year [1957–58].
IH Inhibition height (GPWS).
I h 1 Mean horizontal candlepower.
2 Heater current.
IH Aviation Historical Association (Finland).
IHADSS Integrated helmet and display sight[ing]
system.
I-Hards Improved high-altitude radiation-detection
system.
IHAS 1 Integrated helicopter attack, or avionics,
system.
2 Integrated hazard-awareness, or avoidance, system.
IHC 1 Integrated hand control.
2 Industry Harmonization Conference [rule making].
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