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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-55-00-004
DME SYSTEM - COMPONENT LOCATION - ELECTRONIC EQUIPMENT COMPARTMENT AND ANTENNAS
DME SYSTEM - COMPONENT LOCATION - ELECTRONIC EQUIPMENT COMPARTMENT AND ANTENNAS
EFFECTIVITY
SHZ ALL 34-55-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-55-00-004
Navigation Control Panel
The navigation control panels supply a manual tune frequency
input to the DME interrogator. They also send four auto tune
frequency inputs from the Flight Management Computer (FMC).
The control panels send tune and test data on two output data
buses. One output data bus goes to the MMR receiver and one
output data bus goes to both the DME interrogator and VOR
receiver.
DME Outputs
Each DME interrogator has two output buses. One output bus
supplies data to the on-side flight control computer (FCC). DME
1 sends data to FCC A and DME 2 sends data to FCC B. the
other Output bus supplies data to these units:
* Flight management computer system (FMCS).
* Display electronics units 1 and 2
* Flight data acquisition unit (FDAU).
The FMCS uses DME distance to calculate position updates.
The DEUs use DME distance for displays.
The FDAU receives DME distance and formats it for the flight
data recorder.
Flight Management Computer
The FMC supplies auto tune commands through the navigation
control panel to the DME interrogator. If the navigation control
panel has a failure, the DME gets auto tune signals directly from
the FMC.
DME SYSTEM - ARINC 429 INTERFACES
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-55-00-005
DME SYSTEM - ARINC 429 INTERFACES
DME SYSTEM - ARINC 429 INTERFACES
EFFECTIVITY
SHZ ALL 34-55-00
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-55-00-005
Power Interface
Each DME interrogator receives 115v ac from the DME circuit
breakers.
DME Antenna Interface
The DME antennas transmit and receive DME signals. The
antennas transmit signals to the ground stations. They then
receive the reply signals from the DME ground station and send
them to the interrogator.
Source Select Discrete
The source select discrete controls the ARINC 429 receive ports
in the DME interrogator. With the source select open, the DME
interrogator gets manual and auto tune commands from the
navigation control panel. If the navigation control panel has a
failure, the source select discrete goes to ground. The DME
then gets auto tune signals directly from the FMC.
PSEU
The proximity switch electronics unit (PSEU), supplies an air/
ground discrete inputs to the DME interrogators to set flight leg
count. The air/ground discrete also goes to the navigation
control panels to inhibit test commands in the air.
Default Scan Inhibit Discrete
The default scan inhibit discrete locks the DME interrogator so it
can not make a scan of all the DME frequencies. It tunes to five
channels controlled by the navigation control panel and the
flight management computer.
DME/ATC/TCAS Suppression
These systems operate in the same frequency band:
* DME
* Air traffic control (ATC)
* Traffic alert and collision avoidance system (TCAS).
When a DME interrogator, an ATC transponder, or the TCAS
computer transmits, it sends a suppression pulse through the
suppression lines. This pulse stops the reception of the other
four units. This prevents damage to the receiver circuits of the
other LRUs.
DME Audio
The DME interrogator sends the DME station audio identifier to
the remote electronics unit (REU). The audio goes to the
headsets and the flight interphone speakers.
DME SYSTEM - POWER, ANTENNA, ANALOG, AND DISCRETE INTERFACE
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
34-55-00-006
DME SYSTEM - POWER, ANTENNA, ANALOG, AND DISCRETE INTERFACE
DME SYSTEM - POWER, ANTENNA, ANALOG, AND DISCRETE INTERFACE
EFFECTIVITY
SHZ ALL 34-55-00
Page 13
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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