BendixKing CAS 67A TCAS II - Manual (Page 48)

The FL feature is usually flagged below 18,000 feet MSL unless
barometric corrected altitude is available from an air data source. FL
is flagged on the IVA 81A but not on the radar indicator when used
with the GC 362A, traffic displays. If FL is selected while flagged,
"FL---" is annunciated instead of own flight level.
TA/RA (Traffic Advisory and Resolution Advisory) mode. Activates
the Mode S transponder, altitude reporting, and TCAS “TA/RA”
mode. Aural and visual RAs (Resolution Advisories) will be issued for
traffic determined to be a threat. Traffic will be presented on the traffic
(TA) display. TA/RA mode is annunciated in the display window, on
the optional color radar indicator or dedicated traffic display.
PS 550 TRANSPONDER/ TCAS CONTROL UNIT
PS 550 Single or Dual Mode S/TCAS Control Unit (Dual Unit shown).
PS 550 CONTROLS AND DISPLAYS
The PS 550 Control Unit is the master control for both the TCAS sys-
tem and transponder. The PS 550 will also display the selected 4096
ATC code and current mode of operation in the display window.
Versions are available to control one or two transponders. A “Fail”
annunciation indicates failure of the selected transponder, antenna or
control data.
Note: If the PS 550 is interfaced to a MST 67A Mode S transponder
and the MST 67A senses a failure, a failure annunciation will be shown.
A maintenance check should be performed.
Controls and Displays
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