(e)
Make sure these results occur: 1) The G/S deviation pointer on the PFD's and the ND's moves two dots above the glide path.
2) The glide path deviation pointer on the standby attitude/ILS indicator shows two dots above the glide path.
(f)
Open this circuit breaker:
1) P7 Overhead Circuit Breaker Panel a) 7B17 NAV RADIO MMR R
(g)
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.
(h)
Adjust the output of the ramp test set to supply a signal that is on-course. 1) Make sure the G/S deviation pointer on the first officer's
PFD and ND shows on the glide path.
(i)
Adjust the output of 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.
(j)
Close this circuit breaker:
1) P7 Overhead Circuit Breaker Panel a) 7B17 NAV RADIO MMR R
(k)
Make sure the source receiver annunciation on the first officer's ND changes to ILS R.
M. Glide Slope Antenna Switching and EIU Discrete Interface Test
S 735-247
(1) Do the glide slope antenna switching and EIU discrete interface test:
(a) Use the ramp test set to supply a 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.
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(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
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747-400 MAINTENANCE MANUAL
2) Make sure the glide path deviation pointer on the standby
attitude/ILS indicator shows on the glide path.Install the landing gear door locks 7MIT65B04012 (Ref 32-00-30/201).Put aluminum foil tape on the two glide slope track antennas (B559 and B561) to cause a blockage of the test signal.If aluminum foil tape is not available, do these three steps: 1) Disconnect the DB404A connector from the B404 L G/S ANT SW
RLY on the P31 panel. 2) Disconnect the DB405A connector from the B405 R G/S ANT SW RLY on the P31 panel. 3) Disconnect the DB119A connector from the B119 C G/S ANT SW
RLY on the P31 panel.Make sure all G/S deviation pointers are out of view.Close these circuit breakers: 1) P7 Overhead Circuit Breaker Panel
a) 7D22 ILS ANT SW L
b) 7D24 ILS ANT SW R
c) 7D23 ILS ANT SW C
Put a proximity sensor actuator P/N A27092-31 against the nose
gear up primary proximity sensor (S396) in the wheel well for
the nose gear.
Put a proximity sensor actuator P/N A27092-31 against the nose
gear up alternate proximity sensor (S411) in the wheel well for
the nose gear.
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.
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.Open these circuit breakers: 1) P7 Overhead Circuit Breaker Panel
a) 7D22 ILS ANT SW L
b) 7D24 ILS ANT SW R
c) 7D23 ILS ANT SW C
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747-400
MAINTENANCE MANUAL
(k) Make sure these results occur:
1) The caution message ILS ANTENNA shows on the main EICAS
display.
2) The status messages G/S ANTENNA L, G/S ANTENNA R, and G/S
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