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REFERENCE DESIGNATION -------------------------------------------------------------------------------
34-52-00-720-005 Functional Test of the ATC/Mode S Transponder
 3. Job Set-up
__________ R **ON A/C 106-149, 221-299, 301-399, 401-499,
 Subtask 34-52-00-800-051
 A. Aircraft Configuration NOTE : When the aircraft transponders can operate in Elementary
____
 Surveillance or Enhanced Surveillance mode, do the functional test R of the ATC/Mode S transponder. Refer to TASK 34-52-00-720-005-02 R (Ref. TASK 34-52-00-720-005).
 **ON A/C ALL
 Subtask 34-52-00-860-083
 B. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 Do the ADIRS start procedure (Ref. TASK 34-10-00-860-002).

 (3)
 On the center pedestal:

 (a)
 On the ATC/TCAS control unit, set:

 -
the ATC system 1(2) on.

 -
the ATC code 5555 to keep the traffic interference to a minimum.

 -
the ALT RPTG ON/OFF switch to ON.

 -
the ON/AUTO/STBY switch to ON.

 (b)
 On the SWITCHING panel 8VU:

 -make sure that the AIR DATA selector switch is at NORM.
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 Subtask 34-52-00-865-057 
R  C. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU COM NAV/ATC/1 5SH1 G11 121VU COM NAV/ATC/2 5SH2 K07
 Subtask 34-52-00-480-050 
R  D. Install the T49 - ATC GROUND TEST UNIT (or equivalent) in the cockpit.
 (1) Connect the test antenna to the test unit.
 (2) Put the test antenna near the ATC antenna for which you do the test (approx. 2 ft.).
 NOTE : Use an access platform or a telescopic pole to put the test____ antenna near the ATC bottom antenna.
 Subtask 34-52-00-860-073 
R  E. Obey the applicable safety precautions before you open the LGCIU circuit breakers (Ref. TASK 32-00-00-860-001).
 Subtask 34-52-00-865-061 
R  F. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU L/G/LGCIU/SYS1/NORM 1GA C09 121VU HYDRAULIC/LGCIU/SYS2 2GA Q35 121VU HYDRAULIC/LGCIU/SYS1/GRND SPLY 52GA Q34 

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 4. Procedure
_________ Subtask 34-52-00-720-051-A
 A. Functional Test of the ATC/Mode S Transponder
 NOTE : Do the test of the ATC bottom antenna 1(2) first.

____
 Then, do the test of the ATC top antenna 1(2).

 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the ATC ground test unit:  On the ATC ground test unit:
 - set the ATCRBS/MODE S/TCAS/XPDR
 TEST switch to XPDR TEST.
 - push the TEST pushbutton switch  - the data display shows:
 to start the operation of the  MODE S XPDR COM A/B
 test set.  INTERROGATE TO TEST.
 NOTE : You can also start the____
 same test procedure if you
 push the INTERROGATE
 pushbutton switch. At the
 end of this test
 procedure, a test message
 shows the system status
 but all the results given
 below are not shown.
 - push the TEST pushbutton  - the data display shows:
 switch.  ATCRBS/A
 TESTING
 and then,
 ATCRBS/A
 5555 XX% REPLY
 (XX is a number which indicates the
 local conditions of reception).
 NOTE : You must do the steps that____
 follow in a fast sequence
 to keep incorrect traffic
 alarms to a minimum.
 2. On the ATC/TCAS control unit:

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