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command ejection
command ejection Ordered [not necessarily triggered] by
captain of aircraft.
commander Used only in military aviation, aircraft * has
authority over everyone on board even though he may not
be a member of flight crew. Not synonymous with PIC or
with civil term captain.
command guidance Steering by remote human operator.
command lane The principal channel in a primary flightcontrol
system. It continuously outputs the incoming
flight-control commands on the relevant A629 bus until,
following a malfunction, it is over-ridden by the majority
rule, or [in a more modern system] by the appropriate
standby lane.
command marker Reference index (line, bug, arrow or
other shape) indicating target value, set by pilot on tape
(sometimes dial) instrument and then flown to centre
reference line. (See command reference symbol.)
command parameter Variable subject to command (1),
(2), (4) and thereafter displayed as target value on instrument
or display.
command reference symbol HUD symbology in form of
ring or other shape showing a point at which to aim ahead
of aircraft, eg landing touchdown point or an aerial point
for optimum AOA on overshoot (go-around).
comma rudder Rudder shaped like comma, with balance
area ahead of hinge axis, used without a fixed fin.
Commendation Official praise for skilful flying, written
in personal log book, usually of pilot.
commercial In military use, purchasable from civilian
source (eg aircraft rivet).
commercial aircraft Aircraft flown for hire or reward.
commercial electrics Electrical systems serving
passenger functions only (eg steward call circuits, PA
system, cabin lighting).
commercial load Not defined, but usually means
payload.
commercial support Assistance to operator of civil
aircraft given or sold by original manufacturer or dealer.
com./met./ops. Communications, meteorology,
operations.
commitment Announced decision to purchase an
aircraft type, usually commercial transport.
committal height See decision height.
commodity loading All cargo of one kind grouped
together, without regard to destination.
commodity rate Price charged to fly specified kind of
cargo, typically per kilogramme over particular route.
common aero vehicle 1 Originally this was a standard
design of RV [to house different payloads] for ICBMs.
2 Today, a common vehicle structure for deploying a
variety of customised payloads, including weapons, into
the atmosphere (MSP).
3 Capitalized, “an unpowered, manoeuvrable hypersonic
glide vehicle carrying c1,000lb of munitions”
launched from space to hit within 10ft (USAF).
commonality 1 Hardware quality of being similar to,
and to some degree interchangeable with, hardware of
different design.
2 Objective of using one basic design of aircraft, or
other major system, to meet needs of more than one user
service in more than one role (with economies in training,
spares and other areas).
common automatic recovery system To retrieve UAVs
commutation
on surface ship: electronic guidance to system of nets and
cables on LPD quarterdeck.
common-cause analysis Procedure maitained through
planning, design and operation of a system to identify
common-mode failures of all kinds.
common configuration Numerous plans, mainly USAF,
to bring as many aircraft of one type as possible to
uniform standard, usually by upgrades.
Common Criteria The chief standard for certifying
secure software [very like DO-178B], used by the US and
20 other countries. See EAL2.
common display system Standardised glass cockpit.
common-flow afterburner Augmented turbofan in which
fan and core flows mix upstream of afterburner.
common infrastructure Financed by two or more allies,
eg by all members of NATO.
common mark Marking assigned by ICAO to aircraft of
international agency (eg UN) on other than national
basis. Hence ** registering authority.
common module(s) Use of identical “black box” subsystems
as building blocks for different major
equipments, eg * IR components to build night-vision,
recon., weapon guidance and other systems for different
armed forces or civilian customers.
common route Portion of N American route west of
coastal beacon.
common sensor The principal meaning is a sensor that
intercepts both communications and Elint.
common servicing Performed by one military service for
another without reimbursement.
common-user airlift In US, provided on same basis for
all DoD agencies and, as authorised, other Federal
Government agencies.
communication deception Interference with hostile
communications (including ATC and navaids) with intent
to confuse or mislead.
communication language Complete language structure
for linking otherwise completely separate (and possibly
dissimilar) EDP (1) systems.
communications intelligence Gained by listening, by
whatever means, to hostile communications.
communications satellite Vehicle, normally man-made,
orbiting planetary body, usually Earth, for purpose of
relaying intercontinental telecommunications (telephone,
telex, radio, TV, online etc.) (see active **, passive **,
synchronous **).
communications security Made up of physical security of
transmitter and receiver, emission security of transmitter,
transmission security en route and cryptosecurity of
message.
community Clearly defined group, usually of aircrew, eg
all who fly particular aircraft type or particular type of
mission.
community boundary Drawn around inhabited or urban
areas surrounding airport or airfield.
community noise level Flyover, sideline and approach
NLs measured at designated points on or beyond community
boundary (see noise).
commutated Doppler Form of MLS in which beam is
frequency-coded and/or linearly commutated instead of
scanned in azimuth and elevation.
commutation 1 Repeated reversal of current flow in
winding of electrical machine, esp. to change output from
a.c. to d.c.
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