Garrecht Avionik GmbH
VT-01 Transponder
Installation Manual - english -
Document:
01.0200.11E
Revision: 1.3
9
Interfaces:
Human machine interface / User input
capablity
The system provides 3 buttons and a twinaxle
rotary encoder for inputting values and selecting
operational modes. System messages and
entered values are displayed on a 2 lines / 12
characters LCD display.
Automatic input capability:
On Ground interface:
The system detects the input of an “on ground”
switch. If the aircraft’s frame does not supply
such an information, the input channel will be set
to “airborne” always (ref. to chapter 5.10).
Logic = 0: on ground condition
Suppression interface:
The system provides an suppression interface to
prevent interference with other instruments
installed in the same aircraft (such as DME):
Impedances:
DC: -0,4 V to + 30 V: 7,2 kOhms
DC: < -0,4 V:
1 kOhms
AC:
1 kOhms
Levels:
output: 10 V
input: 7 V - 30 V
Alitcoder capability
The system contains an integral digital alticoder
to provide data about pressure altitude for Mode
C information in 100 ft steps. It’s line has to be
connected to the aircraft’s static pressure
system.
Range: -1000ft to + 40.000ft
Self test routines (BIT)
After powering on, the system runs several
internal self test routines permanently. In case of
errors, the user gets warned visble and audible
and depending on the level of error, the system
stops operating with a permanent error
message.
5.2. Certification base
ETSO-2C112a
EUROCAE ED-73B