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RA SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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RA SYSTEM - GENERAL DESCRIPTION
RA SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
SHZ ALL 34-33-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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General
The RA receiver/transmitters are on the E3 rack in the
electronic equipment (EE) compartment.
The RA antennas are on the bottom of the fuselage.
RA SYSTEM - COMPONENT LOCATION - 1
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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RA SYSTEM - COMPONENT LOCATION - 1
RA SYSTEM - COMPONENT LOCATION - 1
EFFECTIVITY
SHZ ALL 34-33-00
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
These are the components in the flight compartment that
interface with the RA system:
* Left and right EFIS control panels
* Common display system (CDS) display units (DU).
RA SYSTEM - COMPONENT LOCATION - 2
EFFECTIVITY
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RA SYSTEM - COMPONENT LOCATION - 2
RA SYSTEM - COMPONENT LOCATION - 2
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Power
Power for the RA receiver/transmitter 1 is 115v ac from xfer bus
1. RA receiver/transmitter 2 receives 115v ac from xfer bus 2.
Antenna Interfaces
The transmit antenna sends radio frequency (RF) signals to the
ground. The receive antenna sends reflected RF signals to the
receiver circuits of the RA receiver/transmitter.
Flight Control Computer Discrete
The flight control computers (FCC) supply a test inhibit signal to
the RA receiver/transmitter. This signal prevents an RA test
when ILS mode is selected.
PSEU
The RA receiver/transmitter keeps internal and external faults
in a nonvolatile fault memory. The RA receiver/transmitter
keeps these faults by flight segments. The RA identifies the
faults as airborne faults or ground faults. The proximity switch
electronics unit (PSEU) gives the air/ground condition.
Input Program Pins
These are the radio altimeter program pins:
* Continuous data. When grounded, lets continuous altitude
data be transmitted to user systems
* Aircraft installed delay (AID) of 57 feet. This lets the RA
system compensate the altitude calculation for antenna
cable length and distance of the RA system antennas from
the ground at touchdown
* System select. Used to identify which system.
Indicator Discrete
The indicator discrete supplies the status of flight compartment
radio altitude indicators. This system does not use radio altitude
indicators.
RA SYSTEM - POWER, ANTENNA, AND DISCRETE INPUTS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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RA SYSTEM - POWER, ANTENNA, AND DISCRETE INPUTS
RA SYSTEM - POWER, ANTENNA, AND DISCRETE INPUTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-33-00-005
General
The RA system supplies radio altitude (RA) data to these
components:
* FCC A and the FCC B
* Autothrottle computer
* Display electronics unit (DEU) 1 and the DEU 2
* Weather radar R/T
* GPWC
* FDAU
* TCAS computer.
RA Receiver/Transmitter Outputs
Each FCC uses radio altitude from its on-side RA receiver/
transmitter. The FCCs use radio altitude in the approach control
and low altitude flight calculations.
The autothrottle uses radio altitude in the TO/GA calculations
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