ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ELT 345 (P/N: A3-06-2880)
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25-62-35
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2.
Operation
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A.
Overview
1)
A primary feature of the ARTEX ELT 345 is its simplicity of operation.
2)
A connection jumper (“G-switch loop”) between pins 5 and 12 on the D-sub receptacle enables the G-switch
circuitry, allowing activation when the acceleration threshold is exceeded. The jumper is located in the mating
D-sub receptacle of the cockpit remote switch wire harness. When this D-sub receptacle is removed, the ELT
can be manipulated without the possibility of activation.
3)
With the G-switch loop in place, neither the cockpit remote switch nor the ELT control switch can be positioned
to prevent automatic activation. With the G-switch loop open (removed), the ELT cannot be activated by
dropping, rough handling or during shipping.
NOTE:
The toggle switch can still activate the ELT regardless of G-switch loop status.
4)
Activation is indicated by the presence of the swept audio tone transmitted on the 121.5 MHz signal, the buzzer
sounding and the flashing cockpit remote switch and/or ELT status LED. All these indicators immediately begin
upon ELT activation.
5)
To reset the beacon, the position of either the local ELT switch or the cockpit remote switch must be changed
from ‘ON’ to ‘ARMED’. If activation is from the G-switch, the switch position must first be set to ‘ON’ then
changed to ‘ARMED’.
NOTE:
The ELT g-switch CANNOT be disarmed or disabled from the cockpit. Cockpit operation is
limited to activating and resetting the ELT.
6)
A warning buzzer is required by TSO C126b to indicate ELT activation when the aircraft is not operating. The
buzzer is powered by the ELT and is not dependent upon the aircraft power for operation. The indicator ‘beeps’
periodically, with the periods between pulses increasing with activation time.
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B.
Normal Operation
NOTE:
The beacon will begin transmitting approximately 50 seconds after activation and will continue
to do so approximately every 50 seconds until ELT is deactivated.
1)
In normal operation, the ELT is ‘ready to activate’. The cockpit remote switch and the control switch on the ELT
are both in the “ARM” position. The G-switch loop (connection jumper between pins 5 and 12 of the D-sub
receptacle) is in place to enable the ELT. In this condition, if the ELT movement causes the G-switch threshold
to be exceeded, the beacon will activate.
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C.
Manual Activation
1)
The ELT may be manually activated by placing either the remote switch or the ELT control switch in the ON
position. This forces the ELT to activate, regardless of whether or not the G-switch loop is in place.
NOTE:
The ELT cannot be reset if either the cockpit remote switch or the ELT control switch is in the
ON position.
