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ase line, baseline
base line, baseline 1 Yardstick used as basis for comparison,
specif. known standard of build for functioning
system, such as combat aircraft, against which developed
versions can be assessed in numerical terms. Hence, *
aircraft.
2 Geodesic line between two points on Earth linked by
common operative system, eg between two Loran, Decca
or Gee stations.
3 In many types of visual display and pen recorder, line
dislayed in absence of any signal.
base metal 1 Major constituent of an alloy.
2 Metal of two parts to be joined by welding (as distinct
from metal forming joint itself, which is modified or
added during welding process).
base pressure Local aerodynamic pressure on base area
of body moving through atmosphere.
base surge Expanding toroid surrounding vertical
column in shallow underwater nuclear explosion.
base/timing sequencing Automatic sharing of
transponder between several interrogators or other fixed
stations by use of coded timing signals.
BASF Boron-augmented solid fuel.
BASH, Bash Bird/aircraft strike hazard (USAF team).
BASI Bureau of Air Safety investigation (Australia).
Basic British American Security Information Council
(office DC).
basic aircraft Simplest usable form of particular type of
aircraft, from which more versatile aircraft can be
produced by equipment additions. In case of advanced
aircraft, such as combat and large transports, ** includes
IFR instruments, communications, and standard equipment
for design mission.
basic cloud formations Subdivision of cloud types into:
A, high; B, middle; C, low; D, clouds having large vertical
development (International Cloud Atlas, 1930).
basic commercial pilot’s licence Awarded after 220 h
including 100 as P1, allows holder to do aerial work
including VFR pleasure passenger flights in aircraft up to
5,700 kg. Suffix (A), aeroplanes; (H), helicopters.
basic cover Aerial reconnaissance coverage of semipermanent
installation which can be compared with
subsequent coverage to reveal changes.
basic encyclopedia Inventory of one’s own or hostile
places or installations likely to be targets for attack.
basic flight envelope Graphical plot of possible or
permissible flight boundaries of aerodyne of particular
type. Cartesian plot with TAS or Mach number as horizontal
and altitude or ambient pressure as vertical.
Boundaries imposed by insufficient lift, thrust or
structural strength (and sometimes by social and other
considerations); see basic gust *, basic manoeuvring *.
basic gross weight Operating weight empty.
basic gust envelope Specified form of graphical plot for
each new aerodyne design showing permissible limits of
speed for passage through vertical sharp-edged gusts of
prescribed strength (traditionally ± 25, 50 and 66 ft sec –1 ).
Result is V–n diagram, with EAS as horizontal and gust
load factor n as vertical. See gust envelope.
basic load 1 Load (force) transmitted by structural
member in condition of static equilibrium, usually in
straight and level flight (1 g rectilinear), at a specified
gross weight and mass distribution.
2 Aggregate quantity of non-nuclear ammunition,
Bat-Cam
expressed in numbers of rounds, mass or other units,
required to be in possession of military formation.
basic manoeuvring envelope V–n diagram with EAS as
horizontal and manoeuvring load factor as vertical. See
manoeuvring envelope.
basic operating platform See bare base.
basic operating weight Operating weight empty.
basic research See pure research.
basic runway Runway without aids and bearing only
VFR markings: centreline dashes or arrows, direction
number and, if appropriate, displaced threshold.
basic 6 The instruments on a blind-flying panel.
basic supplier Nominated supplier of hardware item in
absence of specific customer option.
basic T In traditional cockpit instrument panel, primary
flight instruments (ASI, horizon, turn/slip and VSI)
arranged in a standard T formation.
basic thermal radiation Thermal radiation from Quiet
Sun.
basic trainer American military aeroplane category used
for second stage in pilot training (after primary), with
greater power and flight performance. Formerly also
‘basic combat’ (BC) category, which introduced armament
and closely paralleled flight characteristics of
operational type; called ‘scout trainer’ by Navy and redesignated
‘advanced trainer’ (obs).
basic weight Superseded term formerly having loose
meaning of mass of aircraft including fixed equipment
and residual fluids.
basic wing Aerofoil of known section used as starting
point for modified design, often with wholly or partly
different section.
basket 1 Radar-defined horizontal circular area of airspace
into which dispensed payloads (eg anti-armour
bomblets) are delivered by bus (5). More loosely, volume
of sky designated to receive free-fall object(s).
2 Car suspended below aerostat for payload, not necessarily
of wickerwork construction.
3 Drogue on a flight-refuelling tanker hose.
4 Across-board sample of aircraft types in calculation
of airport charges.
basket tube Form of construction of liquid-propellant
rocket thrust chamber in which throat and nozzle is
formed by welded tubes, usually of nickel or copper,
through which is pumped liquid oxygen or other cryogenic
propellant for regenerative cooling.
BASO Brigade air support officer.
Bassa British Airlines Stewards and Stewardesses
Association.
BAT 1 Boom-avoidance technique.
2 Beam-approach training.
3 Bureau of Air Transportation (Philippines).
4 Brilliant anti-tank (submunitions).
5 Bombe[s] d’appui tactique (F).
6 Blind-approach technique (WW2).
7 See Bat-Cam.
8 Binary-actuator technology.
BATA British Air Transport Association, formerly
BCASC [office, Artillery House, London SW1P 1RT]
(UK).
Batap B-type application to application protocol.
Bat-Cam Battlefield air targeting-camera autonomous
micro air vehicle.
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