1)  P7 Overhead Circuit Breaker Panel a) 7C1 FMCS FMC L b) 7C23 FMCS FMC R c) 7B17 NAV RADIO MMR R d) 7B6 NAV RADIO MMR C

 (b)  
Do these steps to tune the left ILS receiver: 1) Push the NAV RAD key on the left CDU to show the ALTN NAV

 RADIO page. 2) Put the test frequency into the CDU.
 NOTE: Use a localizer frequency not used in other
____ parts of the system test.
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 (c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

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747-400 MAINTENANCE MANUAL
 3)  Push the LSK that is adjacent to the ILS frequency display.
 4)  Make sure these results occur: a) The PFDs and the NDs show the test frequency. b) ILS L shows on the NDs as the source receiver.
Set the captain's EIU source select switch to L, R and then C.

 NOTE: Stop for approximately 10 seconds at each position.

____

 1) Make sure ILS L continues to show on the NDs.
Close this circuit breaker:
 1) P7 Overhead Circuit Breaker Panel

 a) 7B17 NAV RADIO MMR ROpen this circuit breaker: 1) P7 Overhead Circuit Breaker Panel
 a) 7A6 NAV RADIO MMR LDo these steps to tune the right ILS receiver:
 1)  Push the NAV RAD key on the right CDU to show the ALTN NAV
 RADIO page.
 2)  Put the test frequency into the CDU.
 NOTE:____ Use a localizer frequency not used in other
 parts of the system test.
 3)  Push the LSK that is adjacent to the ILS frequency display.
 4)  Make sure these results occur:
 a)  The PFDs and the NDs show the test frequency.
 b)  ILS R shows on the NDs as the source receiver.

Set the captain's EIU source select switch to L, R and then C.
 NOTE: Stop for approximately 10 seconds at each position.
____
Make sure ILS R continues to show on the NDs.
Close this circuit breaker:
 1)  P7 Overhead Circuit Breaker Panel a) 7B6 NAV RADIO MMR C
Open this circuit breaker:
 1)  P7 Overhead Circuit Breaker Panel
 a)  7B17 NAV RADIO MMR R
Do these steps to tune the center ILS receiver:
 1)  Push the NAV RAD key on the center CDU to show the ALTN NAV
 RADIO page.
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747-400 MAINTENANCE MANUAL
 2)  Put the test frequency into the CDU.
 NOTE: Use a localizer frequency not used in other
____ parts of the system test.
 3)  Push the LSK that is adjacent to the ILS frequency display.
 4)  Make sure these results occur: a) The PFDs and the NDs show the test frequency. b) ILS C shows on the NDs as the source receiver.
 (l) Set the captain's EIU source select switch to L, R and then C.
 NOTE: Stop for approximately 10 seconds at each position.
____
 1)  Make sure ILS C continues to show on the NDs.
 (m)  Close these circuit breakers:
 1)  P7 Overhead Circuit Breaker Panel
 a) 7C1 FMCS FMC L
 b) 7C23 FMCS FMC R
 c) 7A6 NAV RADIO MMR L
 d) 7B17 NAV RADIO MMR R

 S 865-254
 (2)  
Turn off the test equipment and remove it.

 S 865-255

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

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