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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
(3) Clearance and Accessibility Requirements
(4) Installation Notes
H. Blade Antenna
(1) Selecting a Location for the Blade Antenna
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Aspire-200
If mounting on a shelf with other avionic equipment the recommended
minimum thermal clearances are:
•
At least 1 inch (25.4 mm) to the left from the adjacent LRU
•
At least 2.25 inches (57.2 mm) to the right (CNX-900 Heat Sink side).
NOTE: It is very important that any adjacent LRU installed on the
right-hand side of the CNX-900 system doesn't generate excessive
heat that could radiate into the CNX-900 LRU. Usually the
recommended 2.25 inch (57.2 mm) clearance is enough but if the
LRU to the right generates more than 131°F (55°C) during normal
operation, additional separation between CNX-900 and the LRU to
the right might be necessary.
• At least 1 inch (25.4 mm) of air space on the front (to the avionics bay door)
• At least 3 inches (76.2 mm) to the top of the avionics bay closet.
• The minimum wire size for power lines is 16 AWG. It is the installer's
responsibility to ensure that an appropriate sized circuit breaker is used to
protect the power wire gauge selected.
• Ethernet cabling must be used for all Ethernet cables. It is recommended
that 24 AWG wiring be used for Ethernet cables terminating to the ARINC
600 connector of the CNX-900 ALRU.
• Read all notes on drawings and interconnects and the planning paragraph
before installing any units or cabling.
• For enhanced reliability and prolonged life, it is recommended that the
equipment be installed in accordance with the environmental limitations.
For clear satellite communication, install the Blade Antenna on the top of the
fuselage, as close to the centreline and as far aft as possible (away from any
GPS antennas). Make sure that the Blade Antenna has a clear view of the sky
in any direction from 5° to 90° in elevation and 360° in azimuth.
NOTE: The Blade Antenna can access the Inmarsat network only above 20°
inelevation, even though the Blade Antenna can operate at 5° of
elevation.
To prevent interference with GPS systems, the GPS antenna should adhere to
C144 TSO and physical placement should be in accordance with section
2.3.3.13 of ARINC 741:
23-15-45
Page 4-7
28 Feb 2018
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