S 082-333

 (3)  
Disconnect the Ramp Test Set power cable from the primary power source (if it is necessary).

 S 082-334

 (4)  
Disconnect the test cable/s from the Ramp Test Set and the applicable R/Ts or extender box (if installed).

 (5)  
Put the test cables in the the Ramp Test Set.

 (6)  
Install the TEST connector protective cover on the R/T(s).

 S 842-335
 S 412-336
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 S 842-381
 (7)  Do the following to install the receiver/transmitter:
 (a)  Remove the Extender Box, C34005-1.
 (b)  Install the applicable receiver transmitter (REF 34-33-02/401).
 S 862-337
 (8)  Remove the DO NOT ClOSE tags and close these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1)  7B3, RADIO ALTM L
 2)  7B4, RADIO ALTM C
 3)  7C21, RADIO ALTM R

 S 862-338
 (9)
Make sure that the PFDs show a radio altitude of -6|2 feet.

 S 862-288

 (10)
 Remove electrical power if it is not necessary (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 RADIO ALTIMETER SYSTEM - ADJUSTMENT/TEST
________________________________________
 1.  General_______
 A.  This subject has three tasks. The tasks are a ground test, a system test, and a BITE test.
 B.  A test is provided in 34-33-00/201 which uses a ramp test set (radio altitude simulator). The ramp test set causes the radio altimeter R/Ts to output selected altitudes, altitude rate changes, and altitude error. You use these altitudes to do a test of the ground proximity warning system (GPWS) and other systems on the airplane.
 TASK 34-33-00-745-316
 2.  Ground Test - Radio Altimeter System____________________________________
 A.  General
 (1)  This procedure does a ground test of the left, right, and center radio altimeters. You use the central maintenance computer (CMC) and the control display units (CDUs) to start and control the tests. You see the test results on the CDU displays and on the captain's and the first officer's primary flight displays (PFDs).
 B.  References
 (1)  AMM 24-22-00/201, Manual Control
 C.  Access
 (1)  Location Zones
 221 Control Cabin, Left
 222 Control Cabin, Right

 D.  Prepare for the Test
 S 865-191
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-194

 (2)  
Make sure these circuit breakers are closed:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B3 RADIO ALTM L

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747-400 MAINTENANCE MANUAL
 2) 7B4 RADIO ALTM C
 3) 7C21 RADIO ALTM R
 4) 7F22 LANDING GEAR PRI
 5) 7F23 LANDING GEAR ALT

 S 865-196
 (3)  Prepare the CDU for the test:
 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.

 (c)  
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.
　
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