2) The status messages LOC ANTENNA L, LOC ANTENNA R, and LOC ANTENNA C show on the auxiliary EICAS display.
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(e) Set the EIU SEL switch on the EICAS control panel to L, R and then C.
NOTE:____ Stop for 15 seconds at each position.
(f) (g) (h) (i) (j) (k) (l) (m) 1) Make sure the status messages do not change while the switch changes position.Close this circuit breaker: 1) P7 Overhead Circuit Breaker Panel a) 7D22 ILS ANT SW LMake sure the status message LOC ANTENNA L goes out of view on the auxiliary EICAS display.Close this circuit breaker: 1) P7 Overhead Circuit Breaker Panel a) 7D24 ILS ANT SW RMake sure these results occur: 1) The caution message ILS ANTENNA goes out of view on the main EICAS display. 2) The status message LOC ANTENNA R goes out of view on the auxiliary EICAS display.Close this circuit breaker: 1) P7 Overhead Circuit Breaker Panel a) 7D23 ILS ANT SW CMake sure the status message LOC ANTENNA C goes out of view on the auxiliary EICAS display.Use the ramp test set to supply a signal that is on-course.Adjust the RF LEVEL to the threshold level.
NOTE:____ The threshold level is the minimum signal level necessary to give a satisfactory LOC deviation display. If you cannot get the threshold, make sure the displays show NCD.
(n) Put the ramp test set on a 5-10 foot stand behind the airplane.
NOTE:____ Do not change the output of the ramp test set.
(o) Make sure these results occur: 1) The tuned frequency shows on the captain's and the first officer's NDs.
2) 3) ILS L shows on the captain's ND as the source receiver.ILS R shows on the first officer's ND as the source receiver.
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4) The LOC deviation pointer on the PFDs and the NDs shows on-course. 5) The lateral deviation pointer comes into view and is in the center of the standby attitude/ILS indicator.
(p)
Open this circuit breaker:
1) P7 Overhead Circuit Breaker Panel a) 7B17 NAV RADIO MMR R
(q)
Make sure these results occur: 1) The source receiver annunciation on the first officer's ND changes to ILS C.
2) The LOC deviation pointer on the first officer's PFD and ND does not move.
(r)
Close this circuit breaker:
1) P7 Overhead Circuit Breaker Panel a) 7B17 NAV RADIO MMR R
(s)
Make sure the source receiver annunciation on the first officer's ND changes to ILS R.
(t)
Remove the radio altitude input (Ref 34-33-00/501).
(u)
Remove the airspeed input (Ref 34-12-00/501).
(v)
Put the ramp test set in the front of the nose radome.
(w)
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
L. Glide Slope Track Antenna Test
S 735-246
(1) Do the glide slope track antenna test:
(a)
Use the ramp test set to supply a glide slope test signal.
(b)
Adjust the output of the ramp test set to supply a signal that is on the glide path.
(c)
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 comes into view and is in the center of the standby attitude/ILS indicator.
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