Display; Mode Selection Knob; Figure 10. Fdl-978 Controller Display (Typical) - FreeFlight ADS-B FDL-978 Series Installation Manual

3.1.2.1 Display

The display shows the operating mode of the FDL-978 Lite Series and FDL-978-XVR, the
reported pressure altitude, and the current Squawk Code and Call Sign/Flight ID. The pressure
altitude is displayed as a Flight Level, which is the pressure altitude in hundreds of feet. When
non-standard atmospheric conditions apply this may not match the altimeter indicated altitude
but will be correctly reported in the ADS-B message.
Figure 10 shows the FDL-978-XVR powered on in Airborne Transmission mode with a pressure
altitude of flight level 400 ft. being displayed. It also shows the ALT Mode display of the FDL-
978-XVR:
•
Squawk Code
•
Call Sign/Flight ID
•
Reported pressure altitude in hundreds of feet

3.1.2.2 Mode Selection Knob

There is no functional difference between the two ALT positions.
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The wave symbol under the aircraft image traveling upward indicates that
the FDL-978 equipment is receiving ADS-B messages.
The wave symbol under the aircraft image traveling downward indicates
that the FDL-978 equipment is transmitting ADS-B messages.
The Reply Indicator is active when the FDL-978 ADS-B equipment
transmits and receives ADS-B messages. The FDL-978 ADS-B
Transceiver equipment receives ADS-B transmissions regardless of the
transmission mode

Figure 10. FDL-978 Controller Display (Typical)

ADS-B FDL-978 Series and
Lite Series Installation Manual
Document No. 87343 Rev F
3-3