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 1) Make sure the test set shows the IDENT indication, the ATC
 ID code selected on the ATC control panel, and a %Reply
 greater than 90%.
 (d)  Push the TEST switch on the test set to run the ATCRBS/C test.
 1) Make sure the test set shows the airplane's altitude and
 %REPLY greater than 90%.
 (e)  Push the TEST switch on the test set to run the ATCRBS/A Mode S
 ALL test.
 1) Make sure the test set shows the airplane's mode S address,
 and %REPLY greater than %90.
 (f)  Push the TEST switch on the test set to run the ATCRBS/C Mode S
 ALL test.
 1) Make sure the test set shows the airplane's mode S address,
 and %REPLY greater than %90.
 (g)  Push the TEST switch on the test set to run the ATCRBS/A only
 test.
 1) Make sure the test set shows NO Reply From XPDR.
 (h)  Push the TEST switch on the test set to run the ATCRBS/C only
 test.
 1) Make sure the test set shows NO Reply From XPDR.
 (i)  Push the TEST switch on the test set to run the Mode S Surv
 (Identity/Altitude/Short) test.
 1) Make sure the test set shows the airplane's mode S address,
 the airplane's altitude, and %REPLY greater than %90.

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747-400 MAINTENANCE MANUAL
 (j)  Push the TEST switch on the test set to run the Mode S Comm
 (Identity/Altitude/Short) test.
 1)  Make sure the test set shows the airplane's mode S address,
 the airplane's altitude, and %REPLY greater than 99%.
 NOTE:____ Failure to reply by the transponder is not a failure
 of the ATC system.  Contact the transponder vendor
 about the capability of the transponder.
 (k)  Push the TEST switch on the test set to run the Undesired
 replies test.
 1)  Make sure the test set shows No Replies.
 (l)  Push the TEST switch on the test set to run the Squitter test.
 1)  Make sure the test set shows PASS.

 S 725-258
 (12) For test set with the TAP 125 option, push the TEST switch on the test set to run the Mode S Diversity Channel Isolation Test.
 NOTE: The test set shows the diversity test page.
____
 (a)  Make sure the test set shows PASS.
 S 725-257
 (13) For test set without the TAP 125 option, do the Mode S Diversity Channel Isolation Test as follows:
 (a)  Disconnect the antenna cable at the top antenna switch connector, DB872C, and connect the RF through-line wattmeter in its place (WDM 34-53-61).
 S 975-259
 (14) Make a note of the maximum power output and the minimum power output measured by the RF through-line wattmeter during the mode S squitter transmission period.
 (a)  Make sure the minimum power output is 100 times or 20 db lower than the maximum power output.
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 S 035-260
 (15)
 Disconnect the RF through-line wattmeter.

 S 435-261

 (16)
 Connect the antenna cable at the top antenna switch connector, DB872C.

 S 865-316

 (17)
 Insert the antenna coupler over the top ATC antenna.

 NOTE: Make sure the orientation of the antenna coupler setup is
____
 correct.

 S 735-239
 (18) Do the system test again for the right or No. 2 ATC system.
 G. Put the Airplane Back to its Usual Condition
 S 845-240
 (1)  
Remove the antenna coupler and the test set.

 S 845-254

 (2)
Reconnect the antenna cable to the antenna switch connector.

 S 865-393

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
　
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