CAT III a  Operational performance Category III a. An ILS facility.providing.operation.with.no.decision.height. limit.to.and.along.the.surface.of.the.runway.with. external visual reference during final phase of landing.and.with.a.runway.visual.range.of.not.less. than.200.meters.(700.feet).
CAT III b  Operational performance Category III b. An ILS facility.providing.operation.with.no.decision.height. limit.to.and.along.the.surface.of.the.runway. without.reliance.on.external.visual.reference;.and. subsequently taxiing with external visual range of not.less.than.50.meters.(150.feet).
CAT III c  Operational performance Category III c. An ILS facility.providing.operation.with.no.decision.height. limit.to.and.along.the.surface.of.the.runway.and. taxiways.without.reliance.on.external.visual. reference.
CATEVS  Clear.Air.Turbulence.Enhanced.Vision.System
C-BAND  The frequency range between 4,000 and 8,000
MHz.
CBIT  Continuous.Built-In-Test
CBT  Computer-Based.Training
CC  C-Check
CCA  Circuit.Card.Assembly
CCB  ( 1 ) Configuration Control Board.
(.2.).Converter.Circuit.Breaker CCD (.1.).Charged.Coupled.Device.
(.2.).Cursor.Control.Device
CCIR  International.Radio.Consultative.Committee
CCITT  Consultative.Committee.International.Telephone.
and.Telegraph
CCM  Common.Computing.Module
CCMS  Content.Compilation.Management.System.
CCR  Common.Computing.Resource

CCS  (.1.).Cabin.Communication.System.. (.2.).Common.Communication.System.. (.3.).Common.Core.System
CCU  Control.and.Compensation.Unit
CCW  Counterclockwise
CD  (.1.).Carrier.Detect..
(.2.).Chrominance.Difference. (.3.).Compact.Disc
CDA  (.1.).Coordinating.Design.Authority. (.2.).Continuous.Descent.Arrival
CDBR  Cabin.Data.Bus.Repeater
CDG  Configuration Database Generator
CDI  Course.Deviation.Indicator
CDL  Cabin.Discrepancy.Log
CDM  Collaborative.Decision.Making
CDMA  Code.Division.Multiple.Access
CDMS  Collaborative.Decision.Making.System
CDN  (.1.).Canadian.Domestic.Network.(VHF.ACARS).. (.2.).Common.Data.Network
CDP  Continuous.Data.Program
CDR  Critical.Design.Review
CD-ROM  Compact Disc Read-Only Memory
CDS  (.1.).Cabin.Distribution.System. (.2.).Common.Display.System
CDTI  Cockpit Display of Traffic Information
CDU  Control.Display.Unit:.An.input.control/display. usually.part.of.a.Flight.Management.System. (FMS).
CEPT  Conference.Europèene.des.Postes.et. Telècommunications
CES  Cabin Equipment Software
CEU  Checklist.Entry.Unit
CF  Change.Field
CFDIU  Central.Fault.Display.Interface.Unit

CFDS Centralized.Fault.Display.System CFIT Controlled.Flight.Into.Terrain cfm Cubic.Feet.per.Minute CFMU Central.Flow.Management.Unit CFS Cabin.File.Server CG Center.of.Gravity CGI Connecting.Gate.Information CHAN Channel CHG (.1.).Change..