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STUDENT GUIDE FOR T-1A AIRCRAFT SYSTEMS
CHAPTER TWELVE
The altitude data field shows the relative or absolute altitude of the intruder as selected by the
relative/absolute line key.
The VS arrow display indicates the vertical trend of the intruder if the rate is greater than 500
FPM. The arrow points up if the intruder is climbing, and down if descending.
1.   Altitude Type Line - The altitude type line key labeled REL/ABS selects the Relative
(REL) or Absolute (ABS) altitude of the intruder aircraft. Push the REL/ABS line key to display
the selected format (green and underlined). Relative altitude is the difference between the
intruder aircraft altitude and reference aircraft altitude. This display is in hundreds of feet.
2.
Altitude Window Line Key - The altitude window line key selects the TCAS altitude
protection window. The window defines a zone of vertical air space relative to the aircraft.
Intruders into this zone are tracked and considered potential threats. Four altitude protection
windows are provided and labeled:
a.
ABV/BLO - The protection window is 2700 feet above and below the aircraft.
b.
ABV/BLO - The protection window is 9900 feet above and 2700 feet below the
aircraft.
c.
ABV/BLO - The protection window is 2700 feet above and 9900 feet below the
aircraft.
d.
ABV/BLO - The protection window is 9900 feet above and below the aircraft.
NOTE
The underlined portion is displayed in green; without the
underline, it is displayed in white.
1208. RADIO ALTIMETER SYSTEM
The Radio Altimeter (RA) system provides indication of aircraft altitude (radio altitude) from
50-2500 feet AGL. The radio altimeter indicator displays the radio altitude if the radio altimeter
valid signal generated by the radio altimeter transceiver is detected. If the radio altimeter valid is
not detected, the indicator warning flag drops into view.
The indicator DH knob provides a means to set the radio altimeter DH. When the aircraft
reaches the selected DH, the DH light illuminates.
Radio Altimeter Warning Flag
The red warning flag falls into view if an internal failure occurs, operating power is lost, or
during a radio altimeter self-test.
NAVIGATION RADIOS
12-5


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