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in-phase
in-phase Occurring at the same point in each of a series
of phugoids or other SHM or repeated cycles, but caused
by external stimulus.
in-plane bleeder Sustained max-rate turn without
change of height.
inplant Done within factory instead of subcontracted, or
relative to the factory (thus * facilities, * modification).
INPR In progress.
input 1 Point at which signal, data, energy or material
enters system.
2 Signal, data, energy or material entering system.
input axis Axis normal to gyro spin axis about which
rotation of base causes maximum output.
INREQ Request for information.
INRIA Institution Nationale de Recherches
d’Informatique et Automation (F).
INS 1 Inertial navigation system.
2 Ion neutralization spectroscopy.
3 Immigration and Naturalization Services; PASS adds
passenger accelerated service system (US).
4 Information network system.
ins Confusingly, inches.
Insacs Interstate airway communication station (US).
In-Sap, IN-SAP Intelligence special-access program.
InSb Indium antimonide, IR detector 3–5µ.
INSC Instrument comprehension.
insensitive munition One impossible to detonate except
by its own triggering system.
insert 1 Small D-section body fixed inside propelling
nozzle to trim area.
2 To place spacecraft in desired trajectory.
3 To convey friendly force (usually small and covert) to
point on ground deep in enemy territory, usually by helicopter;
hence insertion.
inserted blades Not forming an integral [monolithic]
part of the disc.
inset balance Mass located within movable surface.
inset hinge On conventional control surface one whose
axis is to rear of leading edge.
inset light One flush with airport pavement.
INSI Inertial navigation system interface.
inside wing That pointing towards centre of a turn.
insolation Solar radiation received, usually at Earth or
by spacecraft.
INSP Inspection.
inspectability Unquantifiable measure of extent to
which fault, esp. structural, may escape notice of inspectors
because of inaccessibility or any other reason.
inspect and repair as necessary Not to pre-ordained
schedule.
inspection Search of hardware for evidence of existing or
impending fault condition.
inspection record Meticulous written account of every
technical event, including e.g. record of each stall or other
possibly significant manoeuvre.
inspin yaw Yawing moment holding or accelerating
aircraft into spin.
INST, inst Instrument.
instability 1 Structural condition in which strut, web or
other member buckles under compressive load.
2 Aerodynamic condition in which slightest disturbance
triggers gross disruption or flight of body.
3 Meteorological, normal meaning.
integral construction
installation envelope Overall three-view dimensioned
outline drawings.
instantaneous readout System with zero lag between
sensor and display.
instantaneous VSI One giving instantaneous readout,
with accelerometer air pumps to counteract lag. Also
called instant-lead.
Inst. E The Institute of Electronics (UK).
INSTL Installed, installation.
InstMC Institute of Measurement and Control (UK,
1944–).
INSTR Instruction.
instruction to proceed Informal document accepted as
guaranteeing payment in advance of contract.
instructor In pilot training, pilot qualified and
appointed to teach pupils.
instrument approach Made under non-visual guidance,
normally from aids on the ground.
instrument approach area Volume of sky in which nonvisual
landing aid operates.
instrument approach runway One providing non-visual
directional guidance for straight-in approach.
instrument error Difference between indicated and true
value.
instrument flight Using instruments in place of external
cues.
instrument flight rules, IFR Rules applied in cloud or
whenever external cues are below VFR minima which
prohibit non-IFR pilots/aircraft.
instrument landing Ambiguous but usually IMC landing
without ground aids (thus, non-ILS).
instrument landing system, ILS Standard ground aid to
landing comprising two radio guidance beams (localizer
for direction in horizontal plane and glideslope for
vertical plane with usual inclination 3°) and two markers
for linear guidance. See headings beginning glidepath, and
categories.
instrument meteorological conditions Conditions less
than minima for VFR.
instrument monitor Various meanings from traditional
flight-test panel camera(s) to automatic systems for
notifying faults, ensuring majority vote or isolating failed
instrument (rare).
instrument rating Endorsement to pilot’s licence
allowing flight in IMC.
instrument runway Instrument-approach or precisionapproach
runway.
insulators Poor conductors of electricity, heat, noise or
other forms of energy.
Int 1 Intersection (FAA).
2 Intercom.
Inta Instituto Nacional de Tecnica Aeroespacial
Esteban Terradas (Spain).
intake 1 Air inlet to propulsion or internal system.
2 Narrow-chord leading member of upper flap in CCW
augmentor wing, upstream of shroud and separated by a
slot.
intake duct See inlet duct.
intake heater Heat exchanger inserted to prevent icing in
piston-engine inlet system.
intake stroke See induction stroke.
intcp Intercept[or] or intercept.
integral construction Made from single slab of metal by
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