(a) Make sure the test set shows the correct transponder type.
 NOTE: If the test set shows "no reply from xpdr", do a check
____ on the test antenna connections. Also, make sure the ATC system is operational.
 S 735-087
 (5)  Push the INTERROGATE switch to run a complete test.
 (a)  Make sure the test set does these tests:
 1) ATCRBS/A & SLS
 2) ATCRBS/C
 3) ATCRBS/A Mode S All

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737-300/400/500MAINTENANCE MANUAL
 4) ATCRBS/C Mode S All
 5) ATCRBS/A only
 6) ATCRBS/C only
 7) Mode S Surv Identity
 8) Mode S Surv Altitude
 9) Mode S Surv Short
 10) Mode S Comm Identity
 11) Mode S Comm Altitude
 12) Mode S Comm Short
 13) Undesired Replies
 14) Squitter
 15) Diversity

 NOTE: This test is only available to test set with the TAP
____
 125 option.

 16) Power, Rcvr & Freq

 S 215-088
 (6)  The test set display shows the test results when the test is completed.
 (a)  Make sure the test set shows the same ATC ID code set on the ATC control panel.
 NOTE: If the identification switch on the ATC control panel is
____ pushed during the test, the ID code will have an underscore.
 (b)  
Make sure the Mode S address is correct (WDM 34-53-12).

 (c)  
Make sure the reported altitude agrees with the local field elevation shown on the captain's or first officer's altimeter.

 NOTE: Make sure the reported altitude is within | 125 feet
____ of the local field elevation altitude shown on captain's and first officer's altimeter (applicable for all the altitude reporting check).
 (d)  Make sure the output power is not less than 70W (ERP = 48.5 dBm) and not more than 500W (ERP = 57.0 dBm).
 NOTE: Effective Radiated Power (ERP) is the product of the
____ antenn output power and antenna gain.
 (e)  Make sure the receiver sensitivity , Minimum Threshold Level (MTL), is -74 |3 dBm.
 NOTE: An additional 3dBm loss is allowed to compensate for
____ antenna coupling errors. Also, make sure to correct for other factors that would change the sensitivity measurement.
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 (f)  
Make sure the frequency deviation is less than |1 MHz.

 (g)  
The test set automatically does a check on the MTL difference between mode A and mode C. If the MTL value difference is greater than 1.0 dBm, the test set will show the FAIL indication and stops the test.

 S 735-089
 (7)  For individual test, use the TEST switch to step through each test.
 (a)  Do a check on each test result after each test.
 S 865-201
 (8)  Change the ATC ID code on the ATC control panel to its compliment. The compliment of the code is 7777 minus the code.
 EXAMPLE: If the code is 0340, its compliment is:
 7777 - 0340 = 7437 compliment.
 S 865-202
 (9)  
Push the identification switch on the ATC control panel.

 S 865-203

 (10)
 Push the TEST switch on the test set to run ATCRBS/A test.

 (a)  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%.
 S 865-204
 (11) Push the TEST switch on the test set to run the ATCRBS/C test.
 (a)  Make sure the test set shows the airplane's altitude and %REPLY greater than 90%.
 NOTE: Make sure the reported altitude is within | 125 feet
____ of the altitude shown on captain's and first officer's altimeter.
 S 865-205
 (12) Push the TEST switch on the test set to run the ATCRBS/A Mode S ALL test.
　
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