RADAR TEST SET
OPERATION UNDER USUAL CONDITIONS - Continued
6-8. GENERAL REQUIREMENTS AND SETUP FOR TCAS TESTING
The following guidelines are provided to inform the Test Set operator of typical TCAS testing setup
requirements, and may be different dependent on the specific platform. Refer to platform equipment manuals
for specific testing requirements.
a. Spoof weight on wheels and / or landing gear interlocks (typically a switch in avionics bay).
b. Spoof radar altimeter to read above 5,000 feet or disable radar altimeter IAW platform technical manual.
The following steps are possible methods. (ATCRBS targets will not be correctly displayed if the radar
altimeter tells the TCAS the plane is on the ground.)
Locate radar altimeter unit and disconnect receiver antenna cable. (Typically a box with two RF
connections located in avionics bay).
Locate radar altimeter antennas and place a shield over the receive antenna. (Shield with pie pan,
metal tape, etc.)
Use a radar altimeter Test Set with appropriate antenna coupler.
c. Spoof barometric pressure altimeter. (May not be required under some conditions.)
If other than field altitude is needed, pump static system to 20,000 ft.
Verify that the TCAS / Transponder system is reporting the expected altitude by testing the
transponder using the TS-4530 in the Transponder Mode C test. (There are dual static ports and
barometric altimeters, the TCAS / Transponder may be connected to either system.)
Verify the TS-4530 Interrogator setup altitude is set to the aircraft altitude.
d. Enable Mode S transponder and TCAS system via control head (Typically a small unit located in cockpit
center console between seats).
Select "TA/RA" mode on TCAS control.
If equipped with separate Mode S and Mode 4 transponders, select Mode S transponder (instead
of SIF/M4 transponder) via "Transponder 1/2" switch.
Enable cockpit audio (To allow TCAS advisories to be heard).
e. Adjust TCAS display unit (Typically a medium sized flat panel display located on the cockpit instrument
Set surveillance range to 20nmi. (This allows full scenario to be displayed. Shorter range selection
is ok, however all TS-4530 scenarios start at 15nmi range.)
Surveillance altitude (ABOVE, BELOW, NORMAL) should be set to match the TS-4530 target
simulation. (Typically a small button on TCAS display unit labeled "A/B".
For DIVE scenario select TCAS ABOVE display mode.
For CLIMB scenario select TCAS BELOW display mode.
For all other scenarios select TCAS NORMAL display mode.