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categories
2 For repaired runway crater, profile allows 4.5 in
(114 mm) rise in first 12 ft (3.66 m).
categories 1 For flight crew, licence authorisation to
qualify on all aircraft within broad groups (eg light
aircraft, glider, rotary-wing).
2 For certification of aircraft, grouping based on usage
(eg transport, experimental, aerobatic).
3 In bad-weather landings, operational performance *
are defined by runway visible range and decision height:
Cat 1 or I: DH 60 m [200 ft], RVR 800 m [2,600 ft].
Cat 2 or II: DH 30 m [100 ft], RVR 400 m [1,300 ft].
Cat 3a or IIIa: DH 0, RVR 200 m [700 ft but 650 ft is
closer conversion].
Cat 3b or IIIb: DH 0, RVR 50 m [150 or 165 ft].
Cat 3c or IIIc: DH 0, RVR 0.
4 For aircraft damage and repairability: Cat 1, undamaged;
Cat 2, repairable on unit; Cat 3, repairable by
2 nd echelon or MU; Cat 4, by manufacturer; Cat 5, a writeoff.
5 For runway repairs, see rough field.
6 For airfield conflicts, A = near-collision demanding
extreme action, B = significant potential of collision; C =
ample time to avoid collision (FAA).
7 For runway/taxiway dimensions and bearing
strength, coded A to F (ascending order).
Category 2 box Rectangular box or window in HUD
defining permissible Cat 2 deviation of localiser and G/S.
catenary Curve described by filament supported at two
points not on same local vertical.
catering vehicle Removes and replenishes galley;
conventional truck with scissor lift, elevating body usually
not including cab.
Caterpillar Club Private club formed by Irvin Air Chute
Co and open to all who have saved their lives by using
parachute of any kind.
CAT-EVS CAT(1) enhanced vision system.
CATH, Cath Compact air-transportable hospital.
cathedral Anhedral (pronounced cat-hedral).
cathode 1 Positive terminal of source of EMF (eg
battery).
2 Electrode at which “positive current” leaves solid
circuit.
3 Negative terminal of electroplating cell.
4 In CRT and similar tube, source of electron stream.
cathode-ray oscillograph, cathode-ray oscilloscope,
CRO CRT built into device including amplifier, power
pack and controls for graphic examination of waveforms
and other research.
cathode-ray tube, CRT Vacuum tube along which electrons
(cathode rays) are projected, deflected by pairs of
plates creating electric field (deflected toward positive)
and impact on screen coated with electroluminescent
phosphor.
cathode tuning indicator Triode amplifier and miniature
CRT giving visual indication, by closure of well-defined
shadow area, of changes in carrier amplitude too small to
detect aurally. Also called Magic Eye.
CATIA, Catia Computer-aided 3-D interactive analysis
[anglicized from next].
Catia Conception assistée tridimensionelle interactive
d’applications (F).
Catic (CATIC) China National Aero Technology
Industrial Corporation.
CAWP
cation Positively charged ion, travelling in nominal
direction of current (pronounced cat-ion).
CATM Captive air training missile.
CATO Civil air traffic operations (or officer).
catoptric beam Visible light concentrated into parallel
beam by accurate reflector.
CATP Commonwealth Air Training Plan, originally
BCATP.
Cats, CATS 1 Combined Aerial Target Services (MoD,
UK).
2 Corporate air travel survey.
3 Contracted Airborne Training Services (Canada).
4 Consequence assessment tool set.
5 Computer assistance tools (Phare).
Catsa, CATSA Canadian Air Transport Security
Authority
CATSE Capacity of the air-transport system in Europe
(ECAC).
cat shot Launch of naval aircraft by catapult.
cat’s whisker Delicate current pickoff, eg from gyro.
CATT Combined arms tactical trainer (giant installation
at Warminster, UK).
CATTS Central Air Traffic Training School (RAF
Shawbury, UK).
catwalk Narrow footway along keel of airship.
CAU 1 Cold-air unit.
2 Canard actuation unit.
3 Communication[s] access unit.
CAUFN Caution advised until further notice.
Caul Thin sheet defining surface of composite structure
during ATP(8).
caution note Written on approach chart, usually
warning of high ground.
caution speeds Speeds published in Flight Manual as
limit for each configuration.
Cautra, CAUTRA Co-ordinateur automatique du trafic
aérien Français.
CAUWG Commercial Ada users working group.
CAV Common aero vehicle.
cavalry charge Aural-warning clarion call usually
signifying autopilot disconnect.
cavitation Transient formation and shedding of vapourpressure
bubbles at surface of body moving through
non-degassed liquid, or of vacuum cavities at surface of
body moving through other fluid. Collapse of cavities is
violent, causing extreme implosive pressures.
cavity magnetron Magnetron having resonant cavities
within cylindrical anode encircling central cathode.
cavity resonator Precisely shaped volume bounded by
conducting surface within which EM energy is stored at
resonant frequency.
Cav-OK Ceiling and visibility OK (for VFR), or better
than predicted [said as written].
CAVU Ceiling and visibility unlimited [10 km].
CAW 1 Canadian Auto Workers [major aerospace
union].
2 Circle of Aviation Writers.
cAw. Continental Arctic air mass, warmer than land
surface.
CAWC Combined air-warfare course.
CAWDSG Combat-aircraft wing-design steering
group.
CAWP 1 Central annunciator warning panel.
2 Cockpit assessment working party.
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