(4)
 Remove the DME interrogator (1) from its rack (3).

 (5)
 Put blanking caps on the disconnected electrical connectors (2).

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 DME Interrogator
 Figure 401/TASK 34-51-33-991-001
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1  1  Feb 01/98
 1  1
 1CES  1

 TASK 34-51-33-400-001
 Installation of the DME Interrogator (2SD1,2SD2)

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific access platform 1.6 m (5 ft. 3 in.)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
34-51-00-710-001 Operational Test of the DME R 52-41-00-410-002 Close the Avionics Compartment Doors after Access 34-51-33-991-001 Fig. 401
 3. Job Set-up
__________
 Subtask 34-51-33-860-050

 A. Aircraft Maintenance Configuration
 (1)
 Make sure that the access platform is in position at the access door 824 in zone 128.

 (2)
 Make sure that the access door 824 is open.

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 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 2SD1
 49VU NAV/DME/1 1SD1 G14 FOR 2SD2 121VU COM NAV/DME/2 1SD2 K06
 4. Procedure
_________
 (Ref. Fig. 401/TASK 34-51-33-991-001) Subtask 34-51-33-420-050
 A. Installation of the DME Interrogator
 (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 (2).

 (4)
 Make sure that the electrical connectors (2) are clean and in the correct condition.

 (5)
 Install the DME interrogator (1) on its rack (3).

 (6)
 Push the DME interrogator (1) on its rack (3) to connect the electrical connectors (2).

 (7) Engage the nuts (4) on the lugs (5) and tighten. Subtask 34-51-33-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 2SD1 1SD1 FOR 2SD2 1SD2
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 C. Do the operational test of the DME (Ref. TASK 34-51-00-710-001).
 5. Close-up
________
 Subtask 34-51-33-860-051

 A. Make sure that the work area is clean and clear of tool(s) and other items.
 Subtask 34-51-33-410-050
 B. Close Access R (1) Close the access door 824 (Ref. TASK 52-41-00-410-002).
 (2) Remove the access platform(s).
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_______________________________________________
R 1. General
_______
 **ON A/C 001-049, 101-105, 151-199, 201-220,
 The Air Traffic Control (ATC) system is based on the replies provided by the
 airborne transponders in response to interrogations from the ATC secondary
 radar.
 The ground ATC secondary radar uses technics which provide the air traffic
 control with information that cannot be acquired by the primary radar.
 This system enables to distinguish between aircraft and to maintain
 effective ground surveillance of the air traffic.
 The system provides the air traffic controllers with :

 -
Mode A : transmission of aircraft identification or,

 -
Mode C : transmission of aircraft barometric altitude or,

 -
Mode S : aircraft selection and transmission of flight data for the ground surveillance. The mode S is fully compatible with the other modes, A and C. The mode S bas been designed as an evolutionary addition to the ATC system to provide the enhanced surveillance and communication capability required for air traffic control automation.
　
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