Installation Manual

Table Of Contents

Prerequisites

3-4 Chapter 3: Installation 98-152675-A

Cobham Public

connector/skin penetration area. The gasket may have to be reduced in size to achieve this

and it will be different for different radii of aircraft fuselages.

If an injectable sealant is considered:

1. Apply sealant to the whole undersurface, EXCEPT the yellow areas, the O-ring and the

area inside the O-ring as indicated in Figure 3-2

2. Take care that NO SEALING is applied in the breathing/drainage slot areas indicated in

Figure 3-3. The breathing and drainage slots are also the air paths to allow breathing and

drainage of liquids penetrating the slots due to cleaning or de-icing of the aircraft.

Important

The sealing compound should have a low enough viscosity to be squeezed

out readily during fastening of the attachment 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.

Note

Note the requirements for provisions for grounding and bonding in section

3.4.3 (GB).

Figure 3-2: Areas where NO sealant is to be applied

Figure 3-3: Breathing/drainage slots, both sides

Mounting foot

O-ring sealing area