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A
747-400 MAINTENANCE MANUAL
 3)  AIRPLANES WITH THE "GND SAFETY RELAY" CIRCUIT BREAKER INSTALLED AT PANEL GRID LOCATION 7H08; 7H08, GND SAFETY RELAY
 S 865-049
 (3)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 34-53-00-765-394
 6.  EICAS Interface Test
____________________
 A.  General
 (1)  This test examines the interface between the ATC system and EICAS. No ground equipment is necessary.
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 31-61-00/501, Integrated Display System (IDS)

 (3)  
AMM 34-12-00/501, Air Data Computing (ADC) System

 (4)  
AMM 34-61-02/401, Control Display Unit (CDU)

 C.  Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 D.  Prepare for the EICAS Interface Test
 S 215-384
 (1)  Make sure these systems are serviceable:
 (a)  
Integrated Display System (AMM 31-61-00/501)

 (b)  
Air Data Computing System (AMM 34-12-00/501)

 (c)  
Central Maintenance Computer System (AMM 45-10-00/501)

 E.  Procedure
 S 865-385
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-386

 (2)  
Set the Ground Test Enable switch on the P461 panel to the ENABLE position.

 S 865-387

 (3)  
Set the EIU SEL switch on the EICAS control panel to L, then to C, and then to R.

 (a)  Make sure the upper EICAS display does not show ATC LEFT or ATC RIGHT for each EIU source select switch position.
 NOTE: Push the CANC switch on the EICAS Display Select
____ Panel to see all possible EICAS messages.
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747-400 MAINTENANCE MANUAL
 S 865-388
 (4)  Open these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel:
 1) 7B10, NAV RADIO ATC L
 2) 7B22, NAV RADIO ATC R

 S 865-389
 (5)  Set the EIU SEL switch on the EICAS control panel to L, then to C and then to R.
 (a)  Make sure the upper EICAS display shows ATC LEFT or ATC RIGHT for each EIU SEL switch position.
 NOTE: Push the CANC switch on the EICAS Display Select
____ Panel to see all possible EICAS messages.
 F. Put the Airplane Back to Its Usual Condition
 S 865-390
 (1)  Close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel:
 1) 7B10, NAV RADIO ATC L
 2) 7B22, NAV RADIO ATC R

 S 865-391
 (2)  
Set the Ground Test Enable switch on the P461 panel to the NORM position.

 S 865-392

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 TASK 34-53-00-735-250
 7.  ATC System Mode S Address Test______________________________
 A. General
 (1)  
The ATC system mode S address test makes sure that the ATC mode S transponders installed on the airplane have the correct mode S address code.

 (2)  
The identification code plug that is connected to the back of the ATC transponder supplies the 24 binary bits Mode S addresss code.

 (3)  
The Mode S address codes are the same for the left and right transponder.

 B. Special Tools and Equipment
 (1)  Ohmmeter or continuity checker
　
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