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• Serial number of the transmitter.
• Country code.
• Manufacturer.
• Position coordinates (optional).
The information sent to the satellite is programmed at the factory and
contains a unique number that can be used to identify the beacon. The
ELT 110-406 system consists of a transmitter, antenna, cockpit switch
and indicator light, buzzer (aural monitor), and associated airplane
wiring.
TRANSMITTER AND ANTENNA
The transmitter and antenna are installed in the airplane tail section.
Power for the transmitter is provided by an internal battery pack which
consists of 4 D size lithium manganese dioxide cells connected in series.
The ELT unit incorporates an ON-OFF switch. Because of its location,
this switch is not generally used by the crew. Access to the transmitter
is through an access cover placarded “ELT LOCATED HERE.” The antenna
is externally mounted and is connected to the transmitter using
antenna cable.
Transmitter Switch (ON-OFF)
In the ON position, the transmitter will transmit distress signals continuously.
In the OFF position, the transmitter is armed to activate either
automatically (impact) or manually (remote control from the cockpit
switch). If removed from its mounting rack, the transmitter will be deactivated.
Pilot’s Manual
5-84 PM-132A
COCKPIT SWITCH AND INDICATOR LIGHT
The ELT 110-406 remote control (cockpit panel switch) provides manual
On, Armed, and Reset modes. A 28-vdc indicator light, powered
through the ELT WARN circuit breaker on the options circuit breaker
panel in the tailcone, flashes continuously if the ELT has been activated
and is transmitting.
BUZZER
The buzzer (aural monitor) provides a distinct signal (loud, siren-type
sound) enabling a search and rescue team to locate an aircraft with a
transmitting ELT in a confined area with a large number of aircraft
(such as an airport). The buzzer is installed in the tail section and is
powered by the ELT battery pack. The buzzer does not operate continuously,
but sounds at predetermined intervals, and runs for shorter periods
toward the end of battery life.
OPERATION
Under normal operation, the cockpit switch is in the ARM position. The
switch on the ELT unit will be positioned OFF. With these switch settings,
the ELT will automatically activate on impact. To manually activate
the ELT, set the cockpit switch to the ON position. When the ELT
is activated, the presence of the emergency swept tone, a flashing cockpit
indicator light, and the buzzer in the tail indicates a normally functioning
unit. If the ELT is activated, it can be reset. This is done by
moving the cockpit switch to ON and then immediately back to ARM.
The 406 MHz transmitter will operate for 24 hours and shut down automatically.
The 121.5 and 243.0 MHz transmitter will continue to operate
until the unit has exhausted the battery power. The 406 MHz
transmitter transmits a digital message that allows search and rescue
authorities to retrieve information from a database. Information contained
in the database that may be useful include:
• Type of aircraft.
• Address of owner.
• Telephone number of owner.
• Aircraft registration number.
• Alternate emergency contact.

　
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