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D633A101-SHZ1 Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-31-00-005
General
These are the components that have a digital interface with the
multi-mode receivers:
* Captain and first officer NAV control panels
* Flight data acquisition unit (FDAU)
* Standby attitude indicator
* Ground proximity warning computer (GPWC)
* Flight management computer (FMC)
* Display electronics units (DEU)
* FCC A and FCC B.
Digital Inputs
The NAV control panels supply frequency tune inputs to the
multi-mode receivers. The NAV control panels also send tune
inputs to the VOR and DME systems on a separate data bus.
Digital Outputs
Each MMR has two output data buses. Output data bus 1 goes
to the FCCs. Output data bus 2 goes to many components.
The FDAU receives ILS data and status of the MMR receivers.
The FDAU processes the data for the flight data recorder.
The standby attitude indicator uses localizer and glideslope
deviations for the ILS deviation bar operation. Only MMR 1
sends ILS data to the standby attitude indicator.
The GPWC receives glideslope data from both ILS receivers for
mode 5 (below glideslope) warnings.
The FMC receives ILS data and receiver condition from the two
MMRs. The FMC uses the ILS data for position update
calculations.
The FCCs use ILS data to calculate airplane steering
commands for the digital flight control system (DFCS)
autopilot and flight director modes.
The DEU 1 receives two inputs from MMR 1 and two inputs from
MMR 2. DEU 2 also receives two inputs from MMR 1 and two
inputs from MMR 2. The CDS uses the ILS data to calculate the
localizer deviation and glideslope deviation displays.
ILS - DIGITAL INTERFACE
EFFECTIVITY
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Page 10
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-31-00-006
ILS - DIGITAL INTERFACE
ILS - DIGITAL INTERFACE
EFFECTIVITY
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Page 11
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-31-00-006
General
The frequency transfer switch on the NAV control panel and the
VHF NAV transfer switch on the navigation/displays source
select panel have interface with the FCCs and DEUs.
Frequency Transfer Switch
The frequency transfer switch on the NAV control panel permits
the crew to transfer the frequency from the standby display
window on the NAV control panel, to the active display window.
The transfer switch is a momentary action switch. When you
push the switch, it changes the discrete level to the FCCs. The
discrete tells the FCC when there is an ILS frequency change.
Navigation/Displays Source Select Panel
The VHF NAV switch on the navigation/displays source select
panel is a three position switch. The positions are; BOTH ON 1,
NORMAL, and BOTH ON 2. This switch changes the source of
the data that the DEUs use for the ILS displays.
In the NORMAL position, MMR 1 supplies data for the captain
displays and MMR 2 supplies data for the first officer displays.
When you select BOTH ON 1, the DEUs use MMR 1 as the
source for the captains displays and first officers displays.
When you select BOTH ON 2, MMR 2 is the source for the
captains displays and first officers displays.
Discrete signals also go to the flight control computers (FCCs)
to signal that the switch is not in the normal position.
ILS - FREQUENCY TRANSFER AND INSTRUMENT SWITCHING
EFFECTIVITY
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Page 12
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-31-00-007
ILS - FREQUENCY TRANSFER AND INSTRUMENT SWITCHING
ILS - FREQUENCY TRANSFER AND INSTRUMENT SWITCHING
EFFECTIVITY
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Page 13
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-31-00-007
General
The multi-mode receivers (MMRs) get RF inputs from these
antennas:
* VOR/LOC antenna on the vertical stabilizer
* Localizer antenna in the nose radome
* Glideslope antenna in the nose radome.
The VOR/LOC antenna RF inputs go through the power dividers
then to the localizer (LOC) antenna (ANT) switches.
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