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to digital converter.
Moreover, the different positions of the mode selector
switch and the data, from the potentiometer, are
formatted to ARINC 429 words.
TMUWPWJ01-T03 LEVEL 3
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WR/PWS COMPONENTS - CONTROL UNIT
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34 - NAVIGATION
34-42-00 RADIO ALTIMETER SYSTEM
PRESENTATION
CONTENTS:
Principle
Components
Indicating
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RADIO ALTIMETER SYSTEM PRESENTATION
PRINCIPLE
The Radio Altimeter (RA) System determines the height
of the aircraft above the terrain during initial climb,
approach and landing phases.
The RA can therefore operate over non-flat ground
surface.
The principle of the radio altimeter is to transmit a
frequency modulated signal, from the aircraft to the
ground, and to receive the ground reflected signal
after a certain delay.
The time between the transmission and the reception
of the RA signal is proportional to the A/C height.
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RADIO ALTIMETER SYSTEM PRESENTATION
COMPONENTS
The components are two transceivers, two fans, two
transmission antennae and two reception antennae.
The RA system is also connected to the DMCs for display
on the Primary Flight Displays (PFDs).
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RADIO ALTIMETER SYSTEM PRESENTATION
INDICATING
The aircraft height data is displayed on the Primary
Flight Displays for heights less than or equal to 2500
ft.
The altitude is also shown by means of:
- A ground line rising on to the pitch down area
(Below 300 ft).
- A red ribbon next to the altitude scale
(Below 500 ft).
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34 - NAVIGATION
34-42-00 RADIO ALTIMETER
DESCRIPTION/OPERATION
CONTENTS:
General
Transceiver
Antennae
Fan
Indicating
Users
EIU
LGCIU
CFDIU
Self Examination
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