(b)  
Push the LSK adjacent to <CMC to show the CMC MENU.

 (c)  
Push the LSK adjacent to <GROUND TESTS to show the GROUND TESTS menu.

 (d)  
Push the NEXT PAGE key until you find <34 NAVIGATION RADIOS.

 (e)  
Push the LSK adjacent to <34 NAVIGATION RADIOS to show the GROUND TESTS menu for the navigation radios systems.

 (f)  
Push the NEXT PAGE key until you find <RA-L.

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 (g)  On the CDU display, make sure the carats (<) are adjacent to RA-L, RA-R, and RA-C.
 (2)  S 865-220Open this circuit breaker: (a) P7 Overhead Circuit Breaker Panel 1) 7F22 LANDING GEAR DSP & CONT PRI
 (3)  S 735-292On the CDU display, make sure that RADIO ALTIMETER L, RADIO ALTIMETER R, and RADIO ALTIMETER C are all INHIBIT.
 NOTE:____ Permit 15 to 30 seconds for the word INHIBIT to come into view.
 (4)  S 865-221Close this circuit breaker: (a) P7 Overhead Circuit Breaker Panel 1) 7F22 LANDING GEAR DSP & CONT PRI
 (5)  S 735-293On the CDU display, make sure that RADIO ALTIMETER L, RADIO ALTIMETER R, and RADIO ALTIMETER C do not show the word INHIBIT.
 NOTE:____ Permit 15 to 30 seconds for the word INHIBIT to go out of view.
 (6)  S 865-294Open this circuit breaker: (a) P7 Overhead Circuit Breaker Panel 1) 7F23 LANDING GEAR DSP & CONT ALTN
 (7)  S 735-295On the CDU display, make sure that RADIO ALTIMETER L, RADIO ALTIMETER R, and RADIO ALTIMETER C all show the word INHIBIT.
 NOTE:____ Permit 15-30 seconds for the word INHIBIT to come into view.

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747-400 MAINTENANCE MANUAL
 S 865-287
 (8)  Close this circuit breaker:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7F23 LANDING GEAR DSP & CONT ALTN

 S 735-296
 (9)  On the CDU display, make sure that RADIO ALTIMETER L, RADIO ALTIMETER R, and RADIO ALTIMETER C do not show the word INHIBIT.
 NOTE: Permit 15-30 seconds for the word INHIBIT to go out of
____
 view.

 F.  Radio Altimeter System EIU and CMC Interface Test
 S 735-326
 (1)  Do the interface test for the left radio altimeter:
 (a)  
Open these circuit breakers:

 1)  P7 Overhead Circuit Breaker Panel a) 7B4 RADIO ALTM C b) 7C21 RADIO ALTM R

 (b)  
Set the EIU switch on the captain's source select module to the L position. 1) Make sure the radio altitude shown on the captain's PFD

 is -6 |2 feet.

 (c)  
Set the EIU switch on the captain's source select module to the C position. 1) Make sure the radio altitude shown on the captain's PFD

 is -6 |2 feet.

 (d)  
Set the EIU switch on the captain's source select module to the R position. 1) Make sure the radio altitude shown on the captain's PFD

 is -6 |2 feet.
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747-400 MAINTENANCE MANUAL
 (e)  Push the STAT button on the EICAS Display Panel. 1) Make sure you see the RADIO ALT CENTER and RADIO ALT RIGHT indications on the alternate EICAS display.
 2)  Make sure RADIO ALTM LEFT does not show on the alternate EICAS display.
 NOTE: Permit 15 seconds to make sure RADIO ALTM LEFT does
____ does show on the alternate EICAS display.
　
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