747-400 AMM 飞机维护手册 导航 NAVIGATION 2(40)

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 ANTENNA C show on the auxiliary EICAS display.
 (l)  Set the EIU SEL switch on the EICAS control panel to L, R and
 then C.
 NOTE: Stop for 15 seconds at each position.____
 1) Make sure the status messages do not change while the
 switch changes positions.
 (m)  Close this circuit breaker:
 1) P7 Overhead Circuit Breaker Panel
 a) 7D22 ILS ANT SW L
 (n)  Make sure the status message G/S ANTENNA L goes out of view on
 the auxiliary EICAS display.
 (o)  Close this circuit breaker:
 1) P7 Overhead Circuit Breaker Panel
 a) 7D24 ILS ANT SW R
 (p)  Make sure these results occur:
 1) The caution message ILS ANTENNA goes out of view on the
 main EICAS display.
 2) The status message G/S ANTENNA R goes out of view on the
 auxiliary EICAS display.
 (q)  Close this circuit breaker:
 1) P7 Overhead Circuit Breaker Panel
 a) 7D23 ILS ANT SW C
 (r)  Make sure the status message G/S ANTENNA C goes out of view on
 the auxiliary EICAS display.
 (s)  Use the ramp test set to supply a signal that is on the glide
 path.
 (t)  Make sure these results occur:
 1) The PFDs and the NDs show the test frequency.
 2) ILS L shows on the captain's ND as the source receiver.

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747-400 MAINTENANCE MANUAL
 3) ILS R shows on the first officer's ND as the source receiver. 4) The G/S deviation pointer on the PFDs and the NDs shows on the glide path. 5) The glide path deviation pointer on the standby attitude/ILS indicator shows on the glide path.
 (u)  
Open this circuit breaker:

 1)  P7 Overhead Circuit Breaker Panel
 a) 7B17 NAV RADIO MMR R

 (v)  
Make sure these results occur: 1) The source receiver annunciation on the first officer's ND changes to ILS C.

 2)  The G/S deviation pointer on the first officer's PFD and ND does not move.

 (w)  
Use the ramp test set to supply a signal that is two dots above the glide path. 1) Make sure the G/S deviation pointer on the first officer's

 PFD and ND shows two dots above the glide path.

 (x)  
Close this circuit breaker:

 1)  P7 Overhead Circuit Breaker Panel
 a) 7B17 NAV RADIO MMR R

 (y)  
Make sure the source receiver annunciation on the first officer's ND changes to ILS R.

 (z)
Remove the two proximity sensor actuators.
 (aa) Make sure all G/S deviation pointers are out of view.
 (ab) Remove all aluminum foil tape from the two track antennas.
 (ac) Remove the landing gear door locks 7MIT65B04012

 

 (Ref 32-00-30/201).
 (ad) IF connectors DB404A, DB405A, and DB119A are disconnected, do these three steps: 1) Connect the DB404A connector to the B404 L G/S ANT SW RLY
 on the P31 Panel. 2) Connect the DB405A connector to the B405 R G/S ANT SW RLY on the P31 panel. 3) Connect the DB119A connector to the B119 C G/S ANT SW RLY on the P31 panel.
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747-400 MAINTENANCE MANUAL
 (ae) Use the ramp test set to supply a test signal that is on the glide path. 1) Make sure the G/S deviation pointer on the PFDs and the NDs
 shows on the glide path. 2) Make sure the glide path deviation pointer on the standby attitude/ILS indicator shows on the glide path. (af) Open this circuit breaker: 1) P7 Overhead Circuit Breaker Panel a) 7B17 NAV RADIO MMR R (ag) Make sure these results occur: 1) The source receiver annunciation on the first officer's ND changes to ILS C. 2) The G/S deviation pointer on the first officer's PFD and ND does not move. (ah) Close this circuit breaker: 1) P7 Overhead Circuit Breaker Panel a) 7B17 NAV RADIO MMR R (ai) Make sure the source receiver annunciation on the first officer's ND changes to ILS R.
　
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