(a)  P7 Overhead Circuit Breaker Panel: 1) 7F22, LANDING GEAR DSP & CONT PRI 2) 7F23, LANDING GEAR DSP & CONT ALTN 3) AIRPLANES WITH THE "GND SAFETY RELAY" CIRCUIT BREAKER
 INSTALLED AT PANEL GRID LOCATION 7H08; 7H08, GND SAFETY RELAY
 S 845-241
 (4)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 34-53-00-735-028
 5. ATC System - System Test (With the IFR 601)
___________________________________________
 A. General
 (1)  
The ATC system test completely test the ATC system functions. The IFR ATC-601 ramp test set is used to examine the left and right ATC system.

 (2)  
The IFR 601 test set uses twenty different tests to check the functionality of the ATC transponder. All twenty tests can be run automatically in the AUTO mode or individually in single test mode. Results from the last test are shown on each test page. The PASSED/FAILED indication is shown on top of the page. To do a single test, use the select keys to get to the desired test and push the RUN/STOP key.

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747-400
MAINTENANCE MANUAL

 B. Special Tools and Equipment
 (1)  ATC Transponder Ramp Test Set IFR ATC-601
 C. 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 System

 (4)  
AMM 34-53-02/401, ATC Transponder R/I

 (5)  
AMM 34-61-00/501, Flight Management Computer System (FMCS)

 (6)  
AMM 45-10-00/201, Central Maintenance Computer System (CMCS)

 D. Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH
 223 FWD Upper Deck Passenger Cabin
 125 Area Below Forward Cargo Container Compartment

 E. Prepare for the ATC system test
 S 865-429
 (1)  Make sure these systems are operational:
 (a)  
Integrated Display System (AMM 31-61-00/501)

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

 (c)  
Flight Management Computer System (AMM 34-61-00/501)

 (d)  
Central Maintenance Computer System (AMM 45-10-00/201)

 S 845-029
 CAUTION: DO NOT PLACE THE REMOTE TEST SET ANTENNA CLOSER THAN 15 INCHES
_______ (.40 METERS) TO THE AIRCRAFT ANTENNA WITH THE TEST SET ON. THIS WILL CAUSE DAMAGE TO THE TEST SET.
 (2)  
Put the remote test set antenna between 6 and 300 feet (2 and 90 meters) from the ATC antenna for the related system.

 (3)  
Put the test set antenna in position towards the aircraft antennas.

 S 845-031

 (4)  
Connect the coax cable from the remote test set antenna to the test set.

 S 845-030
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747-400 MAINTENANCE MANUAL
 S 865-032
 (5)  Close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B10, NAV RADIO ATC L
 2) 7B22, NAV RADIO ATC R
 3) 7B23, NAV RADIO ANTENNA SW

 S 715-317
 (6)  
Do the ATC Operational Test.

 S 865-033

 (7)  
Set the PWR switch on the test set to the ON position.

 NOTE: The test set is a source of interference for radio and L-band
____ radar equipment operating near the test set. To avoid possible interference, set the interrogation rate (PFR) to 50 for Mode S interrogation and turn the test set off as soon as the test is completed or when you must perform other radio checks on the airplane.
 S 865-034
 (8)  Push the SETUP key to enter the SETUP menu.
 NOTE: For information regarding the battery test, timing and
　
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