PLG12863E AFI4700 Pilot’s Guide 71
Table 3-13: TCAS Modes
The TCAS system indicates that only traffic
advisories are available and resolution advisories
are not available.
The TCAS indicates test mode is active.
The TCAS system indicates it is off.
Table 3-14: TCAS Submodes
The TCAS system indicates the altitude state is
Absolute. Threat symbols are displayed with
absolute altitude instead of relative altitude.
The TCAS system indicates it is operating in “look
up” mode where traffic detected –2,700 ft and
+9,000 ft of ownship is displayed.
The TCAS system indicates it is operating in “look
up” mode where traffic detected –9,000 ft and
+2,700 ft of ownship is displayed.
The TCAS system indicates that only threats will
be displayed. Normal Proximate and Other traffic
will be suppressed.
3.3.7.3 Offscale Intruders
When the TCAS detects a TA intruder that cannot be displayed on the
HSI due to the selected range, the EFI will annunciate “OFFSCALE” in
the top left corner of the HSI. Additionally, the EFI will display the
intruder symbol on the edge of the HSI. This, in conjunction with the
“OFFSCALE” annunciation, represents that the intruder is at a
distance beyond the other range ring. If the HSI range is increased
beyond the intruder, the “OFFSCALE” annunciation will be removed
and the intruder symbol will be displayed normally on the HSI.
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