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GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 3-8 Rev. 4
3.3.3 NAV Antenna
The NAV antenna is a standard 50Ω horizontally polarized NAV/VOR/Localizer/Glideslope antenna. The
NAV antenna receives VOR frequencies between 108.00 and 117.95 MHz and localizer frequencies
between 108 and 112 MHz and glideslope information between 328.6 and 335.4 MHz Follow the antenna
manufacturer’s installation instructions for mounting antennas, and gain other FAA approval. It is
recommended that the installer use RG-142B, RG-400 or equivalent 50Ω coaxial for the NAV antenna(s).
3.3.3.1 NAV Antenna Cable Splitter Installation
The splitter P/N 013-00112-00 is required to be installed with the NAV antenna coaxial cable wiring in
certain configurations, and it must be installed in accordance with the guidance below. Connecting the
splitter is installation-dependent. Wire the splitter as shown in the applicable diagram in Figure E-18.
When determining a proper location to mount the splitter, use the following guidance:
Locate the splitter such that minimal coaxial cable is used in the installation. In general, this will
be as close to the GTN as practical.
Install the splitter on a flat surface in the fuselage in a location free from excessive vibration.
Splitter installation requires four (4) 4-40 fasteners (torque within 5 to 6 in-lbs). The following
fasteners are recommended:
Stainless Hardware
Name
Part Number
Screw, Pan Head, Stainless
MS51957, (AN515C)
Washer, .016 thickness
NAS1149CN416R, (AN960C-4L)
Washer, .032 thickness
NAS1149CN432R, (AN960C-4)
Nut, Self-locking Metal, Hex, Thin
NASM21043-04, NAS1291C04, (MS21043-04)
Nut, Self-locking Metal, Hex
NASM21046C04, (MS21046C04)
Nutplate, One Lug, Fixed
MS21052, MS21054, MS21072
Nutplate, One Lug, Floating
MS21062
Nutplate, Two Lug, Fixed
MS21048, MS21050, MS21070
Nutplate, Two Lug, Floating
MS21060, MS21076
Nutplate, Corner
MS21056, MS21058, MS21074
Nutplate, Side-by-side
MS21087
Note: Part numbers in parentheses are inactive or cancelled part numbers; these numbers may
still be available and/or referenced on packaging material.
Steel Hardware
Name
Part Number
Screw, Pan Head, Low Carbon Steel
NASM35206, (MS35206), (AN515)
Screw, Pan Head, Alloy Steel
NAS600
Washer, .016 thickness
NAS1149FN416P, (AN960-4L)
Washer, . 032 thickness
NAS1149FN432P, (AN960-4)
Nut, Self-locking Metal, Hex, Thin
NASM21042L04, NAS1291-04, (MS21042L04)
Nut, Self-locking Metal, Hex
NASM21045L04, (MS21045L04)
Nutplate, One Lug, Fixed
MS21051, MS21053, MS21071
Nutplate, One Lug, Floating
MS21061
Nutplate, Two Lug, Fixed
MS21047, MS21049, MS21069
Nutplate, Two Lug, Floating
MS21059, MS21075
Nutplate, Corner
MS21055, MS21057, MS21073
Nutplate, Side-by-side
MS21086
Note: Part numbers in parentheses are inactive or cancelled part numbers; these numbers may
still be available and/or referenced on packaging material.
88


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