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ADS-B FDL-DB Dual Band Series
Installation Manual
Document No. 88552 Rev A
5-52
FFS Copyright © 2020 All rights reserved.
altitude limit of the encoder is likely to be higher than the service ceiling of the aircraft, it is sufficient
to set the upper adjustment at the service ceiling of the aircraft.
DO NOT EXCEED THE ALTITUDE OR RATE OF CLIMB LIMITS OF THE PITOT-
STATIC INSTRUMENTS OF THE AIRCRAFT.
The TC978 altitude encoder is a
solid state device and will not be affected by excess altitude or rate of climb and
descent, but the mechanical instruments in the aircraft can easily be damaged by
being driven beyond their intended range.
1. Set the primary altimeter subscale setting to 1013.2
hectopascal (
hPA), 29.92 in
hectogram (hg).
2. Connect the pitot-static test set to the aircraft.
3. You can enter the altitude encoder calibration setup either after following the steps from
above in order or you can enter directly by holding the FN button down on the controller
on power up to enter setup mode. And skipping over the configuration modes until
reaching the calibrate altitude encoder section. When you are in the calibrate altitude
encoder setup mode the display shows the following information:
4. Rotate the
CODE
knob either clockwise or counterclockwise to display either
Yes
or
No
and select the correct option. Once selected, press the
ENT
button to confirm your
selection and move to the next configuration item in the setup mode. If
No
is selected
then the next configuration item in the setup mode will be displayed. If
Yes
is selected
then options for calibrating the altitude encoder is as shown below.
5. On selecting
Yes
the low altitude set point will now be active, and an altitude will be
displayed as below.
6. On the static test set, drive the altitude to 0 feet.
7. Read the primary altimeter value; rotate the
CODE
knob either clockwise or
counterclockwise until the altitude displayed on the TC978 Controller matches the
aircraft primary altimeter.
8. Press the
ENT
button and the display will move to the mid altitude set point and an
altitude will be displayed as shown below. On the static test set, drive the altitude to the
middle range ceiling of the aircraft.