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OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 44
May 30/02
Revision 7
Voice Recorder Control
Unit
Figure 9
OPERATING MANUAL
2A-23-00
Page 45 / 46
May 30/02
Voice Recorder BULK ERASE Switch
Figure 10
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 47
May 30/02
Revision 7
Voice Recorder Impact Switch
Figure 11
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 48
May 30/02
Revision 7
2A-23-70: Emergency Locator Transmitter System:
1. General Description:
The ARTEX 406 MHz Emergency Locator Transmitter (ELT) system provides
triple frequency homing transmissions when activated. The system is certified
under the requirements of TSO-C126. The ELT system transmits distress signals
at frequencies of 121.5 MHz, 243.0 MHz, and a satellite frequency of 406.025
MHz. The transmitter will activate automatically under emergency conditions (’G’
switch activation inside the ELT transmitter unit) or may be operated manually
from the flight deck to summon assistance in an emergency situation.
The ELT system is composed of the following components:
• ELT Transmitter Unit
• ELT Navigation Interface Unit (Optional)
• Remote Switch
• Antenna
• Aural Monitor
2. Description of Subsystems, Units and Components:
A. ELT Transmitter Unit:
The ELT system automatically activates under emergency conditions (’G’
switch activation) and simultaneously transmits a standard swept tone on
121.5 and 243.0 MHz. Typically, the 121.5 and 243.0 MHz transmitter will
continue to operate for at least 72 hours until the transmitter has exhausted
battery power. The 406.025 MHz transmitter operates for the first 24 hours
of the 72 total hours and then shuts down automatically.
The 406.025 MHz satellite transmitter transmits every 50 seconds for a
period of 520 milliseconds. During that time, an encoded digital message is
sent to the receiving satellite. The information contained in that message is
as follows:
• Country of registration
• Serial number of the ELT
• Latitude and longitude position coordinates (when coupled to the
optional Navigation Interface Unit)
The ELT transmitter unit has a front panel containing, among other items, a
control switch and a red LED indicator. See Figure 12. The control switch
provides manual selection of ON, OFF, and RESET modes. When the ELT
is transmitting, the red LED indicator on the front panel blinks. The light is
not illuminated when the ELT is in the OFF (armed) mode. In addition to
selection of ON and OFF, the control switch can be used to reset the ELT
system from operating to armed by selection from OFF to ON for one
second, then returning the switch to OFF. This is confirmed by the red LED
indicator extinguishing. It should be noted that reset cannot take place if
either the ELT transmitter unit control switch or the remote switch is
selected to ON.
The ELT transmitter unit operates on a self-contained battery and requires
no other power source. It is located in the baggage compartment, usually
on the lower right side. The actual location may vary, however, depending
on outfitting requirements.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 49
May 30/02
Revision 7
B. ELT Navigation Interface Unit (Optional):
The ELT navigation interface unit provides continuous latitude and
longitude position updates from the Flight Management System or Global
Positioning Satellite system and translates the information to the proper
format for use by the ELT. Operating without the navigation interface unit,
the ELT transmitter unit provides position accuracy with 1 to 2 kilometers of
its location. With the navigation interface unit, position accuracy is
improved to within 100 meters.
The ELT navigation interface unit receives power from the Forward
Emergency Battery Bus. It is installed in the baggage compartment
adjacent to the ELT Transmitter Unit.
C. Remote Switch:
The ELT system remote switch is located on the right side of the copilot’s
flight panel. Two types of remote switches are installed on GIV airplanes,
as shown in Figure 13. The functions of each switch are identical,
regardless of the type.
The remote switch provides manual selection of ON, ARM, and RESET
modes. When the ELT is transmitting, a red LED indicator blinks above the
switch. The light is not illuminated when the ELT is in the ARM (armed)
mode. In addition to selection of ON and ARM, the remote switch can be
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