the Aviation Dictionary

idler pulley. ILS categories
the speed of rotation and without adding to or taking nonstandard takeoff minimums and departure
away power from the gear train.
procedures. When departing IFR from such airports, or
from any airports where there are no departure
idler pulley - The idler pulley changes angular
procedures, DPs, or ATC facilities available, pilots
relationships between pulleys but does not change the
should advise ATC of any departure limitations.
direction of rotation of either pulley. An idler pulley is
Controllers may query a pilot to determine acceptable
also used to adjust the tension on the belt that joins a
departure directions, turns, or headings after takeoff.
drive pulley with a driven pulley.
Pilots should be familiar with the departure procedures
idling current - A low output or operating current that
flows in an electronic circuit when there is no input
and must assure that their aircraft can meet or exceed
any specified climb gradients.
signal or output signal.
if no transmission received for (time) - Used by ATC
in radar approaches to prefix procedures that should be
followed by the pilot in event of lost communications.
IFIIAWP - Intermediate FidInitial Approach
Waypoint. The waypoint where the final approach
course of a T approach meets the crossbar of the T.
When designated (in conjunction with a TAA) this
waypoint will be used as an IAWP when approaching
the airport from certain directions, and as an IFWP
when beginning the approach from another IAWP.
IFR aircraft - An aircraft conducting flight in
accordance with instrument flight rules.
IFR conditions - Weather conditions below the
minimum for flight under visual flight rules.
IFR departure procedure -- See IFR takeoff minimums
and departure procedures.
IFR flight - See IFR aircraft.
IFR landing minimums -- See landing minimums.
igniter - The electrical device used to provide the spark
for starting combustion in a turbine engine. Some
igniters resemble spark plugs while others, called glow
plugs, have a coil of resistance wire that glows red hot
when electrical current flows through the coil.
igniter plug - In gas turbine engines, an electrical
sparking device used to start the burning of the fuel-air
mixture in a combustor.
ignition - The process whereby the fuel-air mixture in
either a turbine or reciprocating aircraft engine is
ignited. -
ignition harness - The complete set of wires that
high-voltage current from the magneto to the spark
plugs.
ignition timing - The timing of the fuel-air mixture's
ignition in the cylinders of a reciprocating engine that
ensures the mixture will be burning before the piston
reaches the top of its stroke and the maximum pressure
will be produced in the cylinder as the piston starts
downwid.
IFR military training routes (IR)- Routes used by the illumination -The light output of a light source.
of Defense and associated and Air
illustrated parts catalog (IPC)- A required docurllent
Guard units for the purpose of conducting low-altitude
produced by a manufacturer. It has an exploded view
navigation and tactical training in both IFR and VFR
of the parts and the part numbers for identification. It
weather conditions below 10,000 feet MSL at airspeeds
does not contain approved data.
in excess of 250 knots IAS. .[Jeppesen .. does not chart
these routes.]
illustrated parts list (IPL) - An exploded-view
drawing included in a service manual showing every
IFR over-the-top - With respect to the operation of
part of a component, along with its proper name, part
aircraft, means the operation of an aircraft over-the-top
number, and number required for assembly. This is
on an IFR flight plan when cleared by air traffic control
FAA-approved data and using parts not included in this
to maintain "VFR conditions" or "VFR conditions on
list jeopardizes the airworthiness of the component.
top."
illustrated talk - An oral presentation where the
IFR takeoff minimums and departure procedures -
speaker relies heavily on visual aids to convey ideas to
Federal Aviation Regulations, Part 91, prescribes
the listeners.
standard takeoff rules for certain civil users. At some
airports, obstructions or other factors require the ILS categories -
establishment of nonstandard takeoff minimums, a. ILS Category I - An ILS approach procedure which
departure procedures, or both, to assist pilots in
avoiding obstacles during climb to the minimum
enroute altitude. Those airports are listed in NOSIDOD
Instrument Approach Charts (IAPs) under a section
entitled "IFR Takeoff Minimums and Departure
provides for approach to a height above touchdown of
not less than 200 feet and with runway visual range of
not less than 1,800 feet.
b. ILS Category I1 - An ILS approach procedure which
provides for approach to a height above touchdown of
Procedures." The NOSIDOD 1AP chart legend not less than 100 feet and with runway visual range of
illustrates the symbol used to alert the pilot to not less than 1,200 feet.
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