ELT ELT406GPS, Installation, Operating And Maintenance Manual

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5.4.1 Metal Aircraft
AC 43.13-2A describes several different techniques to install antenna doublers. This is an extra
layer of sheet metal, such as aluminum, that is mounted under the aircraft skin. It is important to
anchor these doublers to other structures such as longerons or former rings to insure stability.
See Fig 3.6 and 3.8 (reprints from AC 43.13-2A)
Use the template supplied to lay out the hole pattern. (Note: ensure the forward arrow of the
template is pointed towards the nose of the aircraft.) Drill the holes as indicated on the template.
See Drawing 901021 for details.
Determine the size and location of the doublers. If the antenna installation is to be made in a
pressurized area then sealant is required.
It is a good idea to dry fit all the parts, then remove the antenna and clean all surfaces of any
debris before continuing. Small metal chips or other foreign items can keep the antenna from
properly seating to the fuselage.
The antenna requires a ground plane of at least 300 square inches. This can be achieved on
metal aircraft if the surface is sufficiently clean of paint, dirt, or any oils to meet these
requirements.
Since the antenna uses a pin-based mounting system it is only necessary to
clean the underside of the doublers approximately ½ ” around each hole .
Install the appropriate sealant to the mating edge of the antenna and fuselage to prevent any
water damage.
Center Line
2.500” 1.25” 1.25” 2.500”
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Emerging Lifesaving Technologies
406 ELT with GPS Antenna Template
DWG #901021 Rev 0 Date Dec. 2009
Drawn by: Seth Bradley
Approved by : Johnny Johnson
General Manager
Forward
.843
.843”
Dia .500”
2.400”
.875
.200 mounting
.500 GPS Antenna
.750 406 ELT Antenna
Emerging Lifesaving Technologies
Antenna Template for P/N 114-042-250
P/N 114-042-600
P/N 914-042-600
DRAWING NOT TO SCALE