Garrecht Avionik GmbH
VT-01 Transponder
Installation Manual - english -
Document:
01.0200.11E
Revision: 1.3
38
10. Determining installed equipment performance
In order to comply with EUROCAE ED-73B, it is required to determine equipment performance of the
installed equipment.
The complete aircraft installation must be certified by authorized personal before operation.
10.1. Checking equipment installation
passed
Accessibility
Controls provided for in-flight operation shall be readily accessible from the operator's
normal seated position. Displayed information shall be clearly viewable, without
obstruction, from the normal seated position(s) of the appropriate operator/crew
member(s).
Aircraft Environment
Installed equipment shall be compatible with the environmental conditions present in the
specific location in the aircraft where the equipment is installed.
Display Visibility
Displays shall be readable from the crew members' normal position in all ambient light
conditions for which the equipment is required.
10.2. Equipment performance
passed
Reply Frequency
Interrogate the installed transponder and verify that the reply frequency is 1090 MHz +-
1
MHz for both Class 1 and Class 2 equipment.
Transmitter Power Output
a. Verify that Class 1 transponders have a peak pulse power at the antenna end of the
transmission line of at least +21 dBW and not more than +27 dBW.
b. Verify that Class 2 transponders have a peak pulse power at the antenna end of the
transmission line of at least +18.5 dBW and not more than +27 dBW.
Receiver Sensitivity
a. Verify that for Mode A/C interrogations the receiver sensitivity of the equipment at the
antenna end of the transmission line is -73 dBm, ±4 dB.
b. Verify that for Mode S P6 type interrogations the sensitivity of the equipment at the
antenna end of the transmission line is -74 dBm, ±3 dB.
Pressure altitude transmissions
Select the mode <ON> (internal alticoder disabled) and verify that
(1) the transponder response to Mode C interrogations consists only of framing
pulses Fl and F2, and
(2) the transponder response to Mode S interrogations UF=4 and UF=20 contains
all ZEROs in the AC field.
