NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-80
Page
2
Code
01
REVISION 38
AOM-145/1114
− Airplane Identification (Call Sign);
− Transponder Capability Report;
− Flight Status (airborne/on the ground);
− Pressure Altitude (minimum resolution: 100 ft (Gillham’s code) or
25 ft as provided by the source).
This facilitates an increase in the safety and efficiency of the ATM (Air
Traffic Management) operations.
For airplanes equipped with Mode S Enhanced Surveillance
Transponder (Post-Mod. SB 145-34-0096 or Post-Mod.
SB 145BAF-34-0007 or equipped with an equivalent modification
factory incorporated), in addition to the characteristics of the Mode S
Elementary, the following Downlink Airplane Parameters (DAP) are
transmitted automatically to be used by the ground Air Traffic
Management:
− Magnetic Heading;
− Indicated Airspeed and/or Mach Number;
− Vertical Rate;
− Roll Angle;
− True Airspeed;
− True Track Angle;
− Ground Speed;
− Selected Altitude.
SELECTOR PANEL
The selector panel, on the main control panel, provides the means for
the flight crew to select either the Mode-S on transponder 1 or the
Mode-S/IFF transponder, according to mission requirements at that
particular moment.
The Mode-S/IFF transponder will be used normally in the mission
area.
1 - IFF POSITION
Selects the Mode-S/IFF transponder. All indications on the RMU
pages are related to the transponder 1 system and TCAS functions will
be dashed. In this case all TCAS II operations is made through the
Mode-S/IFF control panel.
2 - XPDR POSITION
Selects the Mode S transponder. Both Mode-S/IFF transponder unit
and Mode-S/IFF control panel are turned off.
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