mon to automatic flight control systems.
CMN Control Motion Noise
CMOS Complementary Metal Oxide Semiconductor
CMS Cabin Management System
CMU Communications Management Unit
CNDB Customized Navigation Database
CNES Centre national detudes spatiales
C/NO Carrier-to-Noise Density Ratio
CNS Communication,Navigation,Surveillance
CNS/A Communications,Navigation,and Surveillance/Airborne
CNS/ATM Communications,Navigation,andSurveillance/Air Traffic Management
Coasted Track A track that is continued based on previous track characteristics in the absence of surveillance data reports (TCAS).
CODEC Coder/Decoder
COMAC ICAO’s Communications AdvisoryCommittee
COMM Communications
Compass Locator A low-powered radio beacon,used in conjunction with ILS. A compass locator has a 2-letter identifica tion and a range of at least 15 miles.
COMP Compressor
CON Continuous
Cone of Confusion An inverted conical shaped area extending vertically above a VOR ground facility which is void of the bear ing signal.
Consolan A low-frequency, keyed,CW, short baseline system using two antennas to radiate a daisy-shaped pattern for navigational aid purposes. The frequency range is in the 300-kHz region. It is in limited use today.
Contour Contour or iso-counter refers to a weather radar dis-play presentation that blanks the echo returns in the center of a storm cell. The area blanked out is called contour and corresponds to the return levels that exceed a predetermined threshold.
CONUS Contiguous United States
Correction (SSEC) A correction is applied to static source pressure mea surements to partly or completely correct for pres sure errors which are caused by airflow changes. It is computed as a function of Mach and altitude based on measured errors for a particular static system.
Corrective A resolution advisory that instructs the pilot to devi
Advisory ate from current vertical rate (e.g. DO NOT CLIMB
when the aircraft is climbing). (TCAS)
COTS Commercial Off-The-Shelf
CPA Closest Point of Approach
CPC (1) Cabin Pressure Controller
(2) Cursor Position Control
CPCI Computer Program Configuration Item. A CPCI num-
ber identifies the configuration of a computer soft-
ware program.
CPDLC Controller-Pilot Data Link Communications
CPE Circular Position Error
CPI Continuous Process Improvement
CPM Core Processor Module
CPN Collins Part Number
CPRSR Compressor
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