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automatic pull-up
automatic pull-up Preprogrammed steep climb by
(1) aircraft in TFR flight following failure of one pitch
channel, or (2) aerial target at start of parachute recovery.
automatic RDF See ADF.
Automatic Recall In a time of extreme tension, this
would have come into effect if an attacking bomber
carrying NW reached the Go-No-Go Line without having
received the PRM (USAF, RAF, 1960–90).
automatic reverse pitch Facility built into propeller
control system causing it to reduce pitch automatically
past fine-pitch stop through zero to reverse (braking)
position, upon receipt of signal from microswitch
triggered when main gears compress shock struts on
landing. Very rare for reverse pitch to be obtainable
without deliberate selection by pilot, though with ***
pilot may select in air, leaving auto system to send operative
signal.
automatic riveter Machine for drilling holes through
parts to be joined, inserting rivet and closing (heading) it.
automatic roll-out guidance, AROG Steering guidance
after automatic landing in blind conditions (ideally
extended from runway turnoff to terminal parking).
automatic search jammer ECM intercept receiver and
jamming transmitter which searches for and jams all
signals having particular signatures or characteristics.
automatic selective feathering 1 Airborne subsystem
which, in the event of engine failure in multi-engined
aircraft (invariably aeroplane), decides which engine has
failed and takes appropriate action to shut down and
feather propeller.
2 Similar system which, when pilot presses single
feathering button, routes signal automatically to failed
engine and propeller.
automatic slat Leading-edge slat pulled open automatically
at high angle of attack by aerodynamic load upon it.
All slats were originally of this type.
automatic synchronization In multi-engined aircraft
(invariably aeroplane), subsystem which electrically locks
rpm governors of all engines to common speed.
automatic terminal information service See ATIS.
automatic threat countering Ability of EW system to
detect, identify, locate and respond to each hostile
emission without human intervention.
automatic touchdown release Device incorporated in
sling system for external cargo carried below helicopter or
other VTOL aircraft which releases load as soon as sling
tension is released.
automatic tracking Although this could have meaning in
system constraining aircraft to follow preset tracks over
Earth’s surface, universal meaning is property of directionally
aimed system to follow moving target through
sensing feedback signal from it. Applications found in
(1) air-superiority fighter, in which essential to lock-on
and track aerial target automatically, by means of radar,
IR, optics or other system; and (2) ground tracking
station, which may need to follow satellite, aircraft, drone
target or other moving body in order to sustain command
system, interception system, data-transmission system or
other directionally beamed link.
automatic VHF D/F Ground D/F system in which,
instead of requiring manual turning of aerial array to find
null position, signal from aircraft causes aerial to rotate
automatically to this position, direction being at once
autorotation
displayed as radial line on CRT of the equipment. Also
called CRT D/F, CRT/DF.
automatic voice advice In terminal ATC, computergenerated
voice message broadcast to two or more aircraft
warning of potential conflict. Intended primarily for VFR
traffic and for all traffic not under immediate control, and
intended to relieve controller of function that appears to
be safely automated.
automatic voice alerting device Uses digitized human
voice to warn of impending or hazardous situation, warnings
being arranged in order of priority.
autonomous 1 Of aircraft or other vehicle, not needing
GSE.
2 Of an SSR, not co-located.
3 Of airborne equipment, not needing external sensors;
not linked to other aircraft systems (though possibly
under pilot control), eg * reconnaissance pod.
autonomous formation flight Saving up to 20% fuel by
copying geese and using accurate GPS to place at least one
wingtip in tip vortex of preceding aircraft
(NASA/Boeing/UCLA).
autonomous landing guidance Based upon sensors or
other devices in the aircraft.
autonomous logistics information system Monitors all
significant functioning parts of an organism, predicts
expected life and gives advance warning of failure.
autonomous vehicle Vehicle, especially unmanned
aircraft, which completes mission without external help.
autopilot Airborne electronic system which automatically
stabilizes aircraft about its three axes (sometimes, in
light aircraft, only two, rudder not being served), restores
original flight path following any upset, and, in modern *,
preset by pilot or remote radio control to cause aircraft to
follow any desired trajectory. In advanced aircraft * is
integral portion of AFCS and can be set by dial, pushbutton
or other control to capture and hold any chosen
airspeed, Mach, flight level or heading. In avanced
combat aircraft * receives signals from sensing and
weapon-aiming systems enabling it to fly aircraft along
correct trajectories to fire guns or other ordnance at aerial
target or lay down unguided bombs on surface target.
autopilot-disconnect Advanced autopilots are automatically
disconnected by control overloads generated within
aircraft and by certain other disturbances likely to reflect
wish of pilot, eg triggering of stall-protection stickpusher.
autopilot flight-director computer This giverns the AFD
system, which controls the trajectory of the aircraft in the
horizontal plane. It outputs to the FBW control system.
Autoplan Portable EDP which digitises navigation plan
and combines output with other CPGS data to provide
attack-aircraft pilot with complete nav/ECM/weaponaiming
information.
auto power reserve See automatic **.
autopsy Searching examination of crashed aircraft to
discover cause, esp. to detect fatigue failure.
autorotation 1 Loosely, condition in which airflow past
aircraft causes whole aircraft or significant part of it to
rotate. Propeller in this context is not significant, though
windmilling propeller is autorotating.
2 In helicopter, descent with power off, air flowing in
reverse direction upwards through lifting rotor(s), causing
it to continue to rotate at approximately cruise rpm. Pilot
preserves usual control functions through pedals, cyclic
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