ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
DGL-1, DONGLE (453-4010)
570-4010 Rev. G
Company Confidential
Page 20 of 30
F.
RTCA
1)
DO-204, § 3.1.8 guidelines for mounting a ELT:
a)
The ELT shall be mounted to primary aircraft load carrying structures, such as trusses, bulkheads,
longerons, spars, or floor beams.
b)
The mounts shall have a maximum static local deflection no greater than 0.1 inches (2.5 mm) when
a force of 100 lbs (450 newtons) is applied to the mount in the most flexible direction. Deflection
measurements shall be made with reference to another part of the aircraft not less than 1 foot (0.3
meters) nor more than 3 feet (1.0 meters) from the mounting location.
2)
DO-182, § 6.2.2.b recommends that:
a)
To maximize the probability of the ELT transmitting a detectable signal after a crash, all ELT system
components, which must survive a crash intact, e.g., transmitter and external antenna, should be
attached to the airframe in such a manner that the attachment system can support a 100 g load,
(ELT weight x 100, ELT antenna weight x 100, etc.) applied through the center of gravity of the
component (ELT, antenna, etc.) in the plus and minus directions of the three principal axes of the
aircraft.
b)
Post-crash critical components of the ELT system, e.g., transmitter and external antenna, should be
mounted as close to each other as possible.
2.
Mechanical
A.
Dongle Location
CAUTION
:
AVOID INSTALLING THE DONGLE WHERE IT MAY BE SUBJECTED TO
UNPROTECTED EXPOSURE TO HARSH CHEMICAL FLUIDS, SUCH AS
DEICING COMPOUNDS. THESE TYPES OF CHEMICALS MAY CAUSE DAMAGE
TO FASTENERS AND ELECTRICAL COMPONENTS, AS WELL AS ELECTRICAL
CONNECTOR CORROSION.
1)
Mount the Dongle within 2 feet (610 mm) of the ELT, such that the interface harness does not exceed
3 feet (914 mm) including strain relief.
2)
The Dongle chassis and ELT are mounted to the same support structure in most installations.
B.
Dongle Installation
1)
Coordinate the Dongle installation with the ELT installation whenever possible. If the Dongle is an
add-on to an existing ELT installation, extend/modify the existing ELT support structure to
accommodate the Dongle.
2)
See Figure 4 Dongle Outline and Dimensions.
Figure 4 Dongle Outline and Dimensions
3)
Mount the Dongle on the protective top cover on the ELT with four screws (P/N 201-6324-01)
4)
Test the ELT installation in accordance with Test and Fault Isolation on page 14.
