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centrifugal separator
centrifugal separator See centrifuge filter.
centrifugal twisting moment Moment tending to rotate
propeller blades towards zero pitch (opposing coarsening
of pitch).
centrifuge 1 Device for whirling human and other
subjects about vertical axis, mainly in aerospace medicine
research.
2 Device for imparting high unidirectional acceleration
to hardware under test.
3 Device for imparting high unidirectional acceleration
to mixtures of fluids with or without particulate solids to
separate constituent fractions.
centrifuge filter Action, inherent in turbofans and some
other machines, which in rotating fluid flow causes
unwanted particulate solids to be centrifuged outwards
away from core.
centring, centering Radial and, usually, also axial
constraint of floated gyro to run equidistant at all points
from enclosure.
centring control System which, on demand, centres a
variable in another system.
centripetal Acceleration toward axis around which body
is rotated; usually equal and opposite to centrifugal (see
coriolis).
centrisep Centrifugal separator (centrifuge filter).
centroid In geometrical figure (one, two or three
dimensional), point whose co-ordinates are mean of all
co-ordinates of all points in figure. In material body of
uniform composition, centre of mass.
Centrospas [also rendered Tsentro-] Ministry for
defence, emergencies and natural disasters (R).
CEO 1 Chief executive officer of corporation or
company.
2 Crew Earth observation.
CEOA Central Europe Operating Agency (NATO
pipelines).
CEOC Colloque Européen des Organisations de
Contrôle (Int.).
CEOI Common electronic operating instructions.
CEOS Committee on Earth Observation Satellites
(Int.).
CEP 1 See circle of equal probabilities; also called
circular error probable.
2 Concurrent evaluation phase.
3 Chromate-enriched pellet.
4 Common engine program.
CEPA 1 Commission d’Evaluation Pratique d’Aéronautique
(F).
2 Common European Priority Area.
Cepana Commission d’Examen Permanent des
Matériels Nouveaux d’Aéronautique (F).
CEPME College for Enlisted Professional Military
Education (USAF AU).
CEPr Centre Essais de Propulseurs (Saclay, F).
CEPS Central European pipeline system (NATO).
CEPT 1 Conférence Européenne des Postes et
Télécommunications (Int.).
2 Cockpit emergency procedures trainer.
CER 1 Cost-estimating relationship.
2 Certified emission reduction[s].
ceramal See cernet (from ceramic + alloy).
ceramel See cernet (from ceramic metal).
Cerap Combined Center Radar Approach Control.
CES
CERCA Commonwealth and Empire conference on
Radio for Civil Aviation.
Cerdec Communication-Electronics Research,
Development and Engineering Center (USA).
Ceres 1 Clouds and Earth’s radiant-energy system.
2 Computer-enhanced radio emission surveillance
(UK).
CERFP Chemical, biological, radiological, nuclear or
high-yield explosive enhanced response force package.
ceria glass Amorphous semiconductor glass doped with
cerium dioxide.
cerium Reactive metal, Ce, density 8.2, MPt 799°C.
Cerma, CERMA Centre d’Etudes et de Recherches de
Médecine Aéronautique (F).
cermet 1 Composite material attempting to combine
mechanical toughness of metal with hardness and refractory
qualities of ceramics. Early examples cemented
carbides, eg tungsten carbide sintered with cobalt.
2 Incorrectly, part made of ceramic bonded to metal.
CERNAI Study Commission on international air navigation
(Brazil).
CERP Centre-Ecole Régional de Parachutisme.
Cerrobase US lead-bismuth alloy, MPt 125°C.
Cerrobend US bismuth-tin-lead-cadmium alloy, MPt
68°C.
Cerromatrix US lead-tin-antimony alloy, MPt 105°C.
CERS 1 Centre Européen de Recherche Spatiale (see
ESRO).
2 Carrier evaluation and reporting system.
CERT 1 Centre d’Etudes et de Recherches de Toulouse
(ONERA).
2 Committee on Energy Research and Technology
(European Community).
Certico Committee on Certification (ISO).
Certificate of Airworthiness Issued to confirm each individual
aircraft is airworthy, renewed at intervals (CAA).
Also issued for basic type of aircraft, called Type certificate
in US.
Certificate of Compliance Issued to confirm functioning
part of aircraft has been made/overhauled/repaired
correctly (CAA).
Certificate of Experience Document required by private
pilot showing flying as PIC in each preceding 13-month
period (CAA UK).
Certificate of Maintenance Issued upon completion of
major overhaul or other routine work affecting airworthiness
(CAA).
Certificate of Release [for Service] Issued after heavy
maintenance.
Certificate of Test Document issued on release of refurbished
or overhauled item.
certification For aircraft, issue of ATC (4) for US, C of
A for UK or equivalent by national certifying authority,
stating type meets all authority’s requirements on grounds
of safety. Other aircraft certificates include Production
and Registration.
certification pilot Test pilot employed by national certification
authority to evaluate all types of aircraft
proposed for use by operator in that country, from whatever
source.
certification test Test conducted by certification
authority prior to issue of certificate.
CES 1 Catapult-end speed.
2 Civil Engineering Squadron (USAF).
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