89000046-014 KSN 780/8XX/900 AeroNav AML STC Installation Manual for Helicopters
Rev 0 Page-3-6
© Honeywell International Inc. Do not copy without express permission of Honeywell.
must be selected as “Non-WAAS”. This will result in the FMS functionality of the AeroNav XXX
inhibiting selection of any WAAS (SBAS) approach in the database.
Installing a new GPS antenna listed in Table 34 requires additional structural approval beyond the
scope of this manual.
3.3.6 GPS Interference
After installing the AeroNav XXX System, the GPS antenna must be tested to insure no interference is
present. The GPS Antenna System is subject to interference from VHF COM transceiver, Emergency
Locator Transmitter (ELT) antenna, or Direction Finder (DF) receiver which can radiate harmonics that
can potentially interfere with the GPS antenna.
If a VHF Communication transceiver is found to be the problem, installing a 1.57542 GHz notch filter
may help to reduce the problem.
3.3.7 Ground Plane
The GPS Antenna should be mounted on a minimum of 8 x 8 inch metal surface or ground plane.
3.3.8 Dual AeroNav XXX Installations
If the aircraft has dual AeroNav XXX, the aircraft is permitted to have a non-WAAS system and a
WAAS system installed, however, if the two antennas are not of the same type (i.e. dual non-WAAS or
dual WAAS installation), then FMS-related data (flight plans, waypoints, routes, etc) will not be
shared between AeroNavs.
3.3.9 Anti-Ice Protection
If the aircraft is approved for flight into known icing, verify the GPS antenna is installed in location
that is not susceptible to ice buildup or complies with FAA AC 20-138( ) paragraph 13-2.
3.4 VHF Communication Antenna
Note: This section is N/A for the AeroNav 880/780.
The VHF communication antenna should be installed using this manual, FAA AC 43.13-( ), AC 20-67B
and the antenna manufacturer’s guidance.
The antennas should be installed to allow maximum separation between antennas. If possible, one
antenna should be installed on the top of the aircraft, and the other on the bottom of the aircraft.
3.4.1 Antenna Environmental Qualifications
Verify the antenna is appropriately qualified to be installed on the aircraft. Reference the antenna
manufacturer’s RTCA DO-160(x) qualification form.
3.4.2 VHF Communication Cable
The antenna cable should be RG-142B, RG-400, or an equivalent 50Ω coaxial cable.
3.4.3 VHF Coaxial Cable Connector
The connectors on the VHF communication coaxial cable should be assembled per the connector
manufacturer’s assembly instructions.
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