RADAR TEST SET
OPERATION UNDER USUAL CONDITIONS - Continued
c. Press any button to bring the Test Set out of standby mode to active mode or apply power to the Test Set.
If the Test Set is in standby mode, pushing any button will bring it to the
previous power on condition.
d. Press and hold the S3 button for 3 seconds at any time to select a different test mode
e. If mode 4 transponder testing is desired the code load function must be executed prior to testing. Code
loading is described in WP0005 00 (TRANSPONDER MODE 4 PROGRAMMING PROCEDURE).
Interrogator testing may or may not require setting the Test Set to an appropriate altitude (platform
dependant). The Test Set's altitude select screen is accessible after entering the interrogator test mode
(See Menu Structure Chart, Figure 6-1). The altitude is incremented in 500 ft. steps by pushing the S2
button. Mode 4 interrogator testing requires a KIT-1C COMSEC device to be attached during the
interrogator testing. Connect the KIT-1C COMSEC device and program the device with the correct code
of the day. The KIT-1C COMSEC device may be disconnected at the conclusion of interrogator tests.
g. If the message "FAULT = ANGLE" is displayed, excessive reflection was detected by the Test Set.
Change positions and restart the test.
h. After each test, check if the ACCEPT or REJECT indicator is illuminated. If the ACCEPT lamp is on,
proceed to the next step. If the REJECT lamp is on, observe the displayed text to determine the FAULT
Repeat all tests while aiming at the second antenna of the UUT (if equipped). If so equipped, both aircraft
antennas must be tested for proper operation.
Four intruder flight patterns are available for interrogator or TCAS testing. The intruder approach speed is
fixed at 720 nmi/h, scenario starting distance is 15 nmi, ending distance is 0.5 nmi for ATCRBS and 0 nmi
for Mode S. The intruder flight profile options are level, dive, climb, and above. The flight profiles are
selected using the S1 control button. Dive, climb, and above intruder starting altitude is 5000 feet (1525
m) above or below the Test Set altitude set in step g. Intruder flight status (range and altitude) are
accessed using the S3 button. The scenarios can be restarted or repeated at any time by pushing the S2
Initiate Transponder (Paragraph 6-6) or Interrogator (Paragraph 6-7) testing.
6-6. TRANSPONDER TESTING.
Mode S capable transponders operate differently dependent on the state of
the aircraft in-air / on-ground status. It may not be possible to test all
transponder operational modes without spoofing the on-ground condition to
in-air, which may be impractical in some test situations. Refer to the
appropriate platform equipment manuals for proper test conditions and