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Receiver Functional Description
All inputs to the receiver go through a high intensity radiated
frequency (HIRF) filter. This filter provides protection to internal
circuits.
Tune inputs from the NAV control panel go to the main
processor. The processor sends the tune frequency to the
frequency synthesizer circuits. The frequency synthesizer
circuits tune the localizer receiver and glideslope receiver.
The receiver circuits send the RF signal inputs from the
antennas to the main processor. The processor computes
localizer deviation and glideslope deviation.
ILS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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ILS data goes out on two ARINC 429 buses. Output 1 goes to
FCC A and FCC B. Output 2 goes to these LRUs:
* FDAU
* Standby attitude indicator
* GPWC
* FMC
* DEUs.
The A/D function of the receiver converts the audio from the
localizer ground station from an analog to a digital format. The
audio then goes to the main processor. The main processor
sends the audio to the REU. The processor also detects any
morse code station identifier and sends it out on the data buses.
When there is a station identifier on the data bus, the DEUs
replace the frequency display with the four letter station
identifier.
Test
To start an ILS test, push the NAV control panel test switch
when there is an ILS frequency active or push the front panel
test switch. When the processor receives a test signal, it does a
test of operation and receiver condition. Test results show on
the front panel LED status indicators. The LRU status LED
shows red for test faults or green if there are no faults. The
control fail LED comes on red if there is no tuning input data
from the control panel. The control fail LED will show green for
valid tune inputs.
ILS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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ILS - FUNCTIONAL DESCRIPTION
ILS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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EFIS Controls
To show ILS data on the captain’s and F/O’s displays, set the
mode selector on the EFIS control panel to the APP position.
DFCS Controls
The digital flight control system (DFCS) mode control panel
(MCP) supplies runway heading data to the display electronics
unit (DEU) for ILS displays. You use the DFCS MCP course
selector to set the course for approach.
The DEU uses the course input and ILS deviation to calculate
the airplane’s deviation from the runway centerline. The DEUs
compare the course input to the airplane’s track to calculate if
this is a back course approach. If the course input and airplane
track are different by more than 90 degrees, the DEUs show
backcourse ILS displays.
Audio Control Panel Controls
The audio control panels (ACPs) lets the crew listen to ILS
station audio or the morse code station identifier.
You use the ACP receiver switches to select the ILS audio you
want to listen to. The NAV 1 receiver switch selects the MMR 1
audio and the NAV 2 receiver switch selects the MMR 2 audio.
The filter switch lets you listen to only voice audio in the voice
(V) position. The range (R) position lets you listen to the station
morse code identifier. With selector in the both (B) position you
can listen to both the voice audio and the morse code station
identifier.
ILS - CONTROLS
EFFECTIVITY
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ILS - CONTROLS
ILS - CONTROLS
EFFECTIVITY
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General
The standby attitude indicator gives the crew an alternate
attitude indication source. The indicator also provides ILS data.
You use the approach selector on the indicator to show ILS
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