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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
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(2) Altitude Tracking Volumes
TCAS tracks other transponder equipped aircraft that are in a relative altitude range of
±10,000 feet.
NOTE:
The display altitude volumes are different from the internal tracking
volumes.
The typical display volumes are ±8700 feet.
B. TCAS Sensitivity Level - Operating Modes
TCAS logic separates the adjacent airspace into the altitude layers as shown in Figure
2. A
different sensitivity limit level for issuing RAs and TAs is applied to each altitude layer. Lower
altitudes have less sensitive RA and TA limit levels to prevent unwanted advisories in the
higher traffic densities anticipated at lower flight levels, i.e. terminal areas.
The following TCAS sensitivity level, resolution advisory, and traffic advisory specifications
data is given as an aid to help the reader understand basic TCAS operation. The data in this
manual can be superseded by the data in the Minimum Operational Performance Standards
document and the latest Honeywell software documentation.
