4. Procedure_________
 (Ref. Fig. 401/TASK 34-52-12-991-001)
 Subtask 34-52-12-020-050
 A. Removal of the ATC/TCAS Control Unit (3SH) 
R R R R R  NOTE : If your ATC/TCAS control unit has an INOP label(s) on its face and____ if you must use this (these) label(s) for the new ATC/TCAS control unit: - remove this (these) label(s) carefully - keep them for installation on the new ATC/TCAS control unit.
 (1) Loosen the four quarter-turn fasteners (1).
 (2) Disengage the ATC/TCAS control unit (2) from its housing (5).
 (3) Disconnect the electrical connectors (4) and hold them away from the panel.
 (4) Remove the ATC/TCAS control unit (2).
 (5) Put blanking caps on the disconnected electrical connectors (3) and (4).

 ATC/TCAS Control Unit
 Figure 401/TASK 34-52-12-991-001
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1  1  Feb 01/98
 1  1
 1CES  1

 TASK 34-52-12-400-001
 Installation of the ATC/TCAS Control Unit (3SH)

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
34-52-00-740-004 BITE Test of the ATC
 34-52-12-991-001 Fig. 401

 3. Job Set-up
__________
 Subtask 34-52-12-865-051

 A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------

R  49VU COM NAV/ATC/1 5SH1 G11 121VU COM NAV/ATC/2 5SH2 K07
 4. Procedure
_________
 (Ref. Fig. 401/TASK 34-52-12-991-001)
 Subtask 34-52-12-420-050

 A. Installation of the ATC/TCAS Control Unit (3SH)
 NOTE : If the new ATC/TCAS control unit has some inoperative

____ functions/modes, install the INOP labels that were on the removed ATC/TCAS control unit.
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Remove the blanking caps from the electrical connectors (3) and (4).

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 (4)
 Make sure that the electrical connectors are clean and in the correct

 condition.

 (5)
 Connect the electrical connectors (4) to the ATC/TCAS Control Unit (2).

 (6)
 Install the ATC/TCAS Control Unit (2) in its housing (5).

 (7) Tighten the four quarter-turn fasteners (1). Subtask 34-52-12-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 5SH1, 5SH2
 Subtask 34-52-12-740-050
 C. Do the BITE test of the ATC (Ref. TASK 34-52-00-740-004).
 5. Close-up
________ Subtask 34-52-12-860-050
 A. Make sure that the work area is clean and clear of tool(s) and other items.
 1EFF : ALL 1 34-52-12Page 405 1 1 Feb 01/98 1 1 1CES 1 TRANSPONDER - ATC/MODE S (1SH1,1SH2) - REMOVAL/INSTALLATION

___________________________________________________________
 TASK 34-52-33-000-001
 Removal of the ATC/Mode S Transponder (1SH1, 1SH2)
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific circuit breaker(s) safety clip(s)
 No specific access platform 1.6 m (5 ft. 3 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 211-299, 301-399, 401-499,
 34-52-33-991-001 Fig. 401
 **ON A/C 201-210,

 34-52-33-991-001-A Fig. 401A
　
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