(10) Do a check of the SLS LEVEL TEST.
(a) Make sure the reply is received when the SLS pulse is -9dB and no reply is received when the SLS pulse is 0dB.
NOTE: Run the SLS level test in less than 95 feet
____
(28.96 meters) of the UUT antenna.
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(11) Do a check of the ATC ONLY ALL-CALL TEST.
(a) Make sure the mode S transponder did not reply to the
interrogation (PASSED TEST).
S 735-185
(12) Do a check of the MODE S ALL CALL TEST.
(a) Make sure the test set shows PASSED and the airplane's mode S address.
S 735-186
(13) Do a check of the INVALID MODE S ADDRESS TEST.
(a) Make sure the mode S transponder did not reply (PASSED TEST).
S 735-187
(14) Do a check of the SPR ON/OFF TEST.
(a) Make sure a reply is received when SPR is ON and no reply is receive when SPR is OFF.
S 735-188
(15) Do a check of the MODE S UF0 TEST.
(a) Make sure (Down-link format) DF=0, AC=(airplane's altitude) and ADDRESS=(airplane's mode S address).
NOTE: Make sure the reported altitude is within |100 feet of
____ the local field elevation altitude shown on the captain's and first officer's altimeter (applicable for all the altitude reporting check).
S 735-189
(16) Do a check of the Mode S UF4 TEST.
(a) Make sure DF=4, AC=(airplane's altitude) and
ADDRESS=(airplane's mode address).
S 735-190
(17) Do a check of the Mode S UF5 TEST.
(a) Make sure DF=5, ID=(selected ATC ID code on the ATC control panel) and ADDRESS=(airplane's mode S address).
S 735-191
(18) Do a check of the Mode S UF11 TEST.
(a)
Make sure DF=11 and AA=(airplane's address).
(b)
Make sure the CA field is not void.
NOTE: The value of the CA field is determined by the
____
manufacturer.
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(19) Do a check of the Mode S UF16 TEST.
(a) Make sure DF=16, AC=(airplane's altitude) and
ADDRESS=(airplane's mode S address).
NOTE: No reply to the UF16 test is not a failure of the ATC
____
system.
S 735-193
(20) Do a check of the Mode S UF20 TEST.
(a) Make sure DF=20, AC=(airplane's altitude) and
ADDRESS=(airplane's mode S address).
NOTE: No reply to the UF20 test is not a failure of the ATC
____
system.
S 735-194
(21) Do a check of the Mode S UF21 TEST.
(a) Make sure DF=21, ID=(selected ATC ID code on the ATC control panel) and ADDRESS=(airplane's mode S address).
NOTE: No reply to the UF21 test is not a failure of the ATC
____
system.
S 735-195
(22) Do a check of the SQUITTER TEST.
(a) Make sure the squitter's period is between 0.8 to 1.2 seconds.
NOTE: If the test set antenna is in line of sight with
____ only one of the ATC antennas, the squitter period will be between 1.6 to 2.4 seconds.
S 735-196
(23)
Do a check of the FREQUENCY TEST.
(a) Make sure the reply frequency of the transponder is 1090 MHz |1MHz.
(24)
Move the test set to less than 50 feet from the top ATC antenna.
S 865-369
NOTE: Make sure the top ATC antenna is not in the line of sight of
____ the test set antenna. Follow the test set operator's guide to reduce multipath errors. Do the test several times with the test set at different locations until you get valid results.
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