B737
MAINTENANCE MANUAL
EFFECTIVITY
Post ELT STC ST03081AT
23-24-00
PAGE 003
JAN 02/07
(4) The ARTEX C406-1 series ELT is designed for a constant power output at 121.5 and 243.0
MHz that will not be less than 23 dBm (200mW) during the 50 hour operational period at
both -20 degrees Centigrade and +55 degrees Centigrade.
(5) A digital information message is sent to the satellite via the 406.025 MHz transmitter. The
modulation is phase modulated and classified as 16K0G1D. Every 47.5 to 52.5 seconds
the 5 watt transmitter is turned on for 440 ms (short message) or 520 ms (long message).
(6) The information sent to the satellite is programmed at the factory and contains a unique
number that can be used to identify the beacon.
(7) The crash force activation sensor or G-switch is designed to activate with a change of
velocity of 4.5 fps +/- 0.5 fps both under normal conditions and while being subjected to 30
G’s of cross axial forces.
(8) The Battery Pack for all the C406-1 series ELT’s consists of 4 “D” size Lithium Manganese
Dioxide cells connected in series. In an effort to increase the safety of the Battery Pack, a
number of features were designed into the battery pack. To prevent the cells from being
charged, diodes are connected across each cell and fuses are connected to the output.
B.
Programming Dongle
(1) The ARTEX DGL-1 dongle allows the operator to easily program aircraft 24-bit (Long
Message Protocol) address into a compatible ELT.
(2) The DGL-1 comes attached to the top cover. The top cover and dongle remain with the
aircraft.
(3) When an ELT is installed, the DGL-1 reprograms the ELT with the aircraft’s 24 bit address.
The operation of the dongle is fully automatic.
(4)
When aircraft power is applied, the DGL-1 verifies the ELT is programmed to the 24 bit
address stored in the dongle. If the addresses match, the DGL-1 shuts down. If there is no
match, the DGL-1 reprograms the ELT to the 24 bit address stored in the dongle and then
shuts down.
C.
Remote Control
(1) The remote control (cockpit panel switch) provides MANUAL ON, ARMED, and RESET
modes.
(2) The remote control wiring between the control and the ELT is designed so that no
combination of short circuits between the remote control, monitor(s), associated wiring and
the airframe will:
(a) Inhibit the equipment from being automatically activated.
(b) Deactivate the ELT after it has been activated.
(c)
Result in additional power drain so that the ELT will not meet the minimum Peak
Effective Radiated Power (PERP) of 17 dBm or Equivalent Isotropic Radiated power
(EIRP) of 20 dBm through the 50 hour operation period at any of the specified
temperatures (-20° C to +55°C).
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