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2 Short tactical run or dive by aircraft at target; single
sweep through or within firing range of enemy air formation
(DoD, IADB).
3 Single orbit by satellite, starting at point Equator is
crossed northbound.
4 Single passage by satellite overhead.
5 Single period of time during which satellite is within
radio contact of control or data-acquisition station.
passenger In addition to basic meaning of humans
carried in vehicle other than vehicle’s crew, normal
meaning in air-carrier terminology is FPP (fare-paying *),
normally, excluding company employees on cheap rate.
Latter, however, are normally included in traffic statistics.
passenger boarding bridge Passenger loading bridge.
passenger breathing equipment 1 Drop-down oxygen
mask.
2 Smoke hood.
passenger control unit Hand-held audio-visual interface
with cabin lightup, temperature, outside camera[s],
communication and entertainment,
passenger loading bridge Covered walkway linking
terminal and parked aircraft; see bridge.
passenger profile Distribution of pax at one airport
through 24-h period.
passenger service charge Fee levied by airport authority
on each departure passenger to help cover its costs.
passenger service unit Originally comprised overhead
punkah outlet, now adds light(s), call button and possibly
other interfaces.
passivating Coating, esp. metal surface, with inert film
to prevent electrochemical corrosion.
passive 1 Receiving but not emitting.
2 System, eg PFCS, which can only fail open.
passive air defence Includes such activities as cover and
concealment, camouflage, deception, dispersion and shelters.
passive attack weapon Precision dart[s] designed to
destroy CBW containers [usually without explosive
charge, which would scatter contents].
passive countermeasures Detection and analysis of
hostile emissions (see ESM).
passive guidance Use of received signals from whatever
source in order to navigate.
passive homing Tending to fly towards source of emission
from target, usually IR.
passive jamming Use of chaff and confusion reflectors.
passive landing gear One utilizing optimised selfadaptive
damping devices.
passive missile One equippped with guidance able to
home on emissions generated by the target.
passive mode Use of airborne radar in receive-only
mode, eg AWACS.
passive munition 1 Delivered safe and then triggered
either by timing system or radio signal.
2 Inert until disturbed, eg mine.
passive paralleling Simplest and most common type of
redundancy wherein two parallel functional devices are
utilized such that, if one fails, second is still available.
Limited to simple elements of control system which can
only fail passive, such as springs and linkages. When
failure of one element occurs, there is an acceptable
change in performance or capability.
passive pilot One who, on long-haul, is relaxing or
taking a nap.
pathfinders
passive radar Misnomer; normally interpreted as
passive mode.
passive ranging Trajectory-measuring systems that do
not rquire a transmitter or transponder in vehicle, eg
Pardop. See next.
passive ranging subsystem Doppler plus phase rate of
change to give direction and range.
passive sonar Listens for emissions from submarine.
passive thermal control Changing attitude of spacecraft
to even-out incident solar flux, esp. by roll through 180°;
so-called barbecue manoeuvre.
pass off To test and clear development or production
item.
pass-off testing The test of each assembled production
item.
PAT 1 Process action team (AFLC).
2 Pilot access, or applications, terminal.
3 Private pilot, airplane, recreational, transition.
4 Pulse active thermography.
5 Pop-up [satellite] archival tag.
PATA 1 Polish air-traffic agency.
2 Pacific Asia Travel Association (Int.).
PATC Professional, administrative, technical and
clerical.
Patca Plurilateral agreement on trade in civil aircraft.
Patch Precision approach to coupled hover.
patch 1 Strong fabric attachment cemented to aerostat
envelope (see eta *, channel *, split *, rigging *).
2 Embroidered or printed badge worn on working
(especially flying) clothing.
3 Area of ground illuminated by airborne radar.
patching Ceremonial admission to exclusive group, such
as Thunderbirds (USAF).
PATCO, Patco Professional Air Traffic Controllers
Organization (US, lost status 1981).
Patec Portable automatic test equipment calibrator.
path 1 Track of aircraft under control of TMA.
2 Projection on Earth’s surface of satellite orbital plane;
same as track.
3 Loosely, aircraft trajectory in 3-D.
Pathfinder 1 Software with immense capacity to extract
intelligence from vast amounts of data.
2 Passive thermal Flir for navigation, detection and
enhanced resolution.
pathfinder aircraft One with special crew plus
drop-zone/landing-zone marking teams, markers and/or
electronic navaids to prepare DZ/LZ for main force
(NATO).
pathfinder drop-zone control Communication and operation
centre from which pathfinders exercise guidance
(DoD, LADB).
Pathfinder Force Elite sub-force within RAF Bomber
Command 1943–45 charged with marking targets for
main-force attack, abb. PFF. Pathfinder Association
supports needy survivors.
pathfinders Four meanings, all defined as plural:
1 Experienced aircrew who lead formation to DZ, RP
or target.
2 Teams dropped or air-landed at objective to operate
navaids.
3 Radar or other navaid used to facilitate homing on
objective, esp. in bad visibility.
4 Teams air-delivered into enemy territory to determine
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