3.3 Operation
In the event of a crash the unit has an automatic activation accelerometer or G-Switch. With a
change of 4.5ft./sec (2.3G), the accelerometer senses the dramatic decrease in speed and
activates the 406 transmitter. In the case of a helicopter unit it has a multi-axis accelerometer to
compensate for the different attitudes of flight that might occur.
When the unit is activated by the G-Switch an aural alert (85db) will go off in the cockpit along
with a visual alert of a flashing green LED located on the Remote switch. The unit can be reset
using the remote switch or the redundant switch mounted on the front of the unit by pressing the
TEST/RESET once. The beacon will automatically return to an ARM state.
3.4 Self-Test modes
There are two separate and distinct self tests. The first is a Systems Self-Test and the second is a
GPS Self Test. Using the remote, the pilot can initiate either test. The remote is equipped with
an ON/ARM/RESET/Test switch, a tri-color (red/yellow/green) LED, and an aural alert. The
self tests will indicate go/no go status.
Caution: THESE TESTS SHOULD ONLY BE DONE ON THE GROUND.
* The system has been designed to restrict continuous self testing. Once a self test has been
activated the microprocessor restricts any further activation until the appropriate wait time of one
minute has been achieved.
See Sec 6.1 for full details on self tests and fault annunciation.
Caution: The life of the battery has been computed to give maximum activation time in
case of an emergency. No more than one self test of the system and GPS should be
accomplished per month. Excessive testing will reduce the transmission time in the event
of an accident.
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