Installation Manual

Installation of the antenna
3-8 Chapter 3: Installation 98-152675-A
Cobham Public
3.5 Installation of the antenna
The following is supplied with the antenna:
•LGA-5005 Mounting Hole Sealing Kit (refer to [4]).
The LGA-5005 can be mounted directly to the aircraft fuselage or to a mounting plate [10]
which has been attached to the fuselage as described in document [11].
The procedure below covers both cases.
1. If applicable, refer to section 3.4.2, either apply sealing compound to the complete
underside of the antenna, excluding the areas of the mounting feet and TNC connector
O-ring, as indicated in Figure 3-5, or apply gasket(s) as per the installer design solution.
2. Connect the CSDU-LGA RF cable to the antenna's TNC connector.
3. Use a 15 mm (0.591") torque spanner to tighten the TNC connectors to 0.46 to 0.69 Nm
(0.34 to 0.51 ft-lb).
4. Position the antenna over the mounting holes in either the fuselage or the mounting
plate, ensuring that the RF cable is aligned and does not get pinched when the antenna
is lowered to its final mounting position.
5. Insert four 10-32 mounting bolts which should not be longer than NAS623-3-18 and
the torque bolts to 3.95 to 6 Nm (2.9 to 4.4 ft-lb).
6. If sealing compound was applied in step 1, remove any excess sealing compound
around the antenna periphery and ensure that the breathing/drainage slots are
completely clear.
7. Check the maximum torque against the bolt specification and the fuselage or mounting
plate structural limitations.
CAUTION! Do not step or walk on the mounting plate.
Important
The sealing compound should have a low enough viscosity to be
squeezed out readily during fastening of the attach bolts to ensure that
the antenna is seated as close to the fuselage skin as possible, i.e. the
bonding areas (feet) should be in contact with the fuselage skin.
Figure 3-5: Base of the antenna
4 x mounting holes
Antenna TNC connector