User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
The antenna consists of a molded radome with radiating/receiving elements and is
completely filled with a rigid foam. The antenna assembly uses five or nine screws to
attach the radome and either four or eight screws to attach the antenna to the aircraft
fuselage.
The ACSS directional antenna has a small frontal area. The circular radome has a 3:1
elliptical leading edge and an extremely low profile height of only 0.806 inches (20.472
millimeters). This yields excellent aerodynamic performance with a minimum possibility of
icing, which could be a hazard for rear mounted engines.
For T
3
CAS TCAS system installations, the top antenna must be a directional antenna.
The bottom antenna can be either a directional or omnidirectional antenna. The T
3
CAS
Computer Unit has the capability of automatically sensing which version is installed.
NOTE:
The bottom omnidirectional antenna is not an option for Part Numbers
9005000-10000, -10101, -10202, and -10204.
The directional antenna mounting screws are standard #10-32 UNF-2A pan head,
corrosion-resistant (stainless) steel screws in accordance with Military Specification
MS51958. The appropriate length is determined by the installer allowing 0.5 inches (12.7
millimeters) for the thickness of the antenna and adapter plate. A washer must be
installed under the head of each mounting screw. The washer must be made of
passivated, corrosion-resistant steel in accordance with MIL-S-5059 or MIL-S-6721. The
Air Force-Navy Aeronautical Standard part number is AN960C10L. The washer has an
outer diameter of 0.438 inches (11.125 millimeters), an inner diameter of 0.203 inches
(5.156 millimeters), and a thickness of 0.032 inches (0.813 millimeters).
An O-ring (included with the directional antenna) is required to be installed between the
directional antenna and the aircraft fuselage. The National Aerospace Standard part
number for the O-ring is NAS 1613. The ACSS part number for the O-ring is 4000171-
240. Table 1-17 contains the leading particulars for the ACSS directional antenna.
NOTE:
For directional antennas, ACSS Part No.7514060-90X, the customer must
provide an adapter plate for mounting to the aircraft. For details of the antenna
base plate, to which the adapter must mate, refer to Section 2. Directional
antennas, ACSS Part No.7514081-9XX, come with a preinstalled adapter
plate.
NOTE:
The mounting surface of the antenna base plate has an Alodine-treated
surface, which provides corrosion resistance. The Alodine application material
does not provide any electrical resistance or isolation. Do not sand or remove
the Alodine material from the surface. In addition, sanding this surface may
damage the unit beyond repair.
The average unit weight of an antenna with adapter plate is approximately 3.0 pounds
(1.361 kilograms).
Pub. No. 8600200-001, Revision 004
34-45-29
1-62
04 Nov 2014
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