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acquisition unit (FDAU).
The DEU shows marker beacon data on the PFDs.
Monitor and Test
The test switch starts a test of the VOR/MB receiver. The built-in
test equipment (BITE) circuits do a test of the VOR/MB receiver.
The test results show on the common display, light emitting
diodes (LEDs), and through the flight interphone speakers and
headsets.
During the test, a self-test frequency generator gives a 75 MHz
RF signal that has 400 Hz, 1300 Hz, and 3000 Hz audio signals.
The bandpass filters find the audio signals and send them to the
audio amplifier. The audio amplifier sends the audio signals to
the REU. The REU sends the audio signals to the flight
interphone speakers and headsets in the flight deck.
The BITE circuits monitor the condition of the output data of the
VOR/MB receiver.
PSEU
The VOR/MB receiver gets an air/ground discrete signal from
the proximity switch electronics unit (PSEU). The VOR/MB
receiver uses this signal to prevent a test in the air.
An internal nonvolatile fault memory (NVM) in the BITE circuits
use the air/ground discrete signal. The NVM uses this signal to
calculate flight legs.
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MARKER BEACON SYSTEM - FUNCTIONAL DESCRIPTION
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General
When you do a test of the marker beacon system, you test the
VOR receiver 1 at the same time.
Operation
When you push the test switch, the receiver does a check of the
internal receiver operation and the interface with the NAV
control panel. The test takes 48 seconds. This is the test
sequence that shows on the LED status indicators during the
test:
* 0 to 2 seconds - the LRU status and the control fail LEDs are
red
* 2 to 4 seconds - the LRU status LED is green and the control
fail LED is red
* 4 to 12 seconds - the LRU status and the control fail LEDs go
off
* 12 to 42 seconds - test status shows.
The LRU status LED indicator shows green for an LRU test pass
condition or red for an LRU test fail condition. The control fail
LED shows red if there is no tune input from the NAV control
panel or if the signal is invalid.
MARKER BEACON SYSTEM - TEST - 1
EFFECTIVITY
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MARKER BEACON SYSTEM - TEST - 1
MARKER BEACON SYSTEM - TEST - 1
EFFECTIVITY
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General
You do a remote test of the navigation receivers with the
navigation control panel. The navigation control panel does a
test of these receivers:
* VOR/MB receiver
* ILS receiver.
When you do a test of the marker beacon system, you do a test
of the VOR/MB receiver 1 at the same time.
Operation
To do a test of the VOR/MB receiver 1, select a VOR frequency
and push the test switch on the front panel of the navigation
control panel. FT shows for common display system indications.
You must select marker beacon audio on at least one of the
ACPs to hear the audio tones. All the marker beacon audio
tones come on in the flight compartment when you do the test.
The audio tones come on continuously and you hear the outer,
middle, and inner at the same time.
MARKER BEACON SYSTEM - TEST - 2
EFFECTIVITY
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MARKER BEACON SYSTEM - TEST - 2
MARKER BEACON SYSTEM - TEST - 2
EFFECTIVITY
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General
The radio altimeter (RA) system measures the vertical distance
　
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