(2)  
Before you do these procedures, do the BITE test for the radio altimeter (Ref. 34-33-00/501).

 (3)  
When you use the Ramp Test Set to simulate altitudes for other systems on the airplane, do the test procedures in sequence until you get to the necessary altitude test.

 (4)  
Refer to 34-46-00/501 for the altitudes and the altitude rates necessary to do a test of the GPWS.

 (5)  
The Ramp Test Set contains test cables that permit test connection to one, two, or three R/Ts.

 B.  Equipment
 (1)  
Ramp Test Set - Atlantis Model DRA-707, Atlantis P/N 110-0430-100.

 (2)  
Box - Extender, Radio Altimeter Receiver Transmitter, P/N C34005-1.

 C.  References
 (1)  
06-09-02/201, Body Section 42 Access Doors and Panels

 (2)  
24-22-00/201, Manual Control

 (3)  
31-61-00/501, Integrated Display System

 (4)  
34-33-00/501, Radio Altimeter System

 (5)  
34-33-02/401, Radio Altimeter Receiver/Transmitter -Removal/Installation

 (6)  
34-46-00/501, Ground Proximity Warning System

 (7)  
Technical Manual - Atlantis Ramp Test Set (Simulator) Model DRA-707, P/N 110-0400-100.

 D.  Access
 (1)  
Location Zones 125 Area Below Forward Lower Lobe Compartment, Left 221 Control Cabin, Left 222 Control Cabin, Right

 (2)  
Access Panel
 125B Access Door Electronics, Left

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747-400 MAINTENANCE MANUAL
 E. Procedure
 S 862-281
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 712-282

 (2)
Make sure the integrated display system operates (Ref 31-61-00/501).

 S 712-283

 (3)
Make sure the radio altimeter system operates (Ref 34-33-00/501).

 S 862-362

 (4)  
Open these circuit breakers and attach DO NOT CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B3, RADIO ALTM L
 2) 7B4, RADIO ALTM C
 3) 7C21, RADIO ALTM R

 S 012-321
 (5)  
Open the access door (125B) on body section 42 to get access to the radio altimeter R/Ts (Ref 06-09-02/201).

 S 842-380

 (6)  
Do these steps to install the extender box:

 (a)  
Remove the applicable receiver/transmitter (REF 34-33-02/401).

 (b)  
Install the Extender Box, C34005-1.

 (7)  
Set the POWER switch on the Ramp Test Set to OFF.

 S 862-324
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 S 482-322
 (8)  Connect the test cable(s) between the TEST connector on the Ramp Test Set and the TEST connector on the R/T(s) or extender box (if installed).
 NOTE: You can do a test of each radio altimeter (L, C,or R)
____ seperately, or all together, with these test cables in the Ramp Test Unit:
 -
Test cable ATLANTIS P/N 110-0440-101 connects between the test jack on the Ramp Test Set and the test jack on Collins digital radio altimeters.

 -
Test cable ATLANTIS P/N 110-0440-106 connects between the test jack on the Ramp Test Set and the test jack on TRT ERT-530 digital radio altimeters.

 -
Test cable Atlantis P/N AY969-00668-001 connects between the test jack on the Ramp Test Set and the C34005-1 Extender Box (if installed).

 S 482-285
 (9)  Connect the power cable to the correct primary power source shown on the front panel of the Ramp Test Set.
 NOTE: If the batteries in the Ramp Test Set have the correct
____
 charge, connection to a primary power source is not
　
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