GTR 225/GNC 255 TSO Installation Manual 190-01182-02
Page 4-2 Rev. B
4.3 Optional Reference Material
4.4 Installation Materials Required but not Supplied
4.4.1 Accessories Required but not Supplied
The following installation accessories are required but not provided.
4.4.2 Materials Required but not Supplied (New Installations Only)
The GTR/GNC is intended for use with the standard aviation accessories. The following items are required
for installation, but not supplied:
Wire (MIL-W-22759/16 or equivalent)
Shielded Wire (MIL-C-27500 or equivalent)
Hardware - #6-32 x 100° Flat Head SS Screw [(MS24693, AN507R or other approved fastener)
(6 ea.)] and #6-32 Self-Locking Nut [MS21042 or other approved fastener (6 ea.)]
Push/Pull (manually resettable) Circuit Breakers
Tie Wraps or Lacing Cord
Ring Terminals (for grounding)
Coaxial Cable (RG-400, RG-142B or equivalent – Refer to Table 4.8 for additional information)
Item Garmin P/N
GTR 225 Pilot’s Guide 190-01182-00
GNC 255 Pilot’s Guide 190-01182-01
Item Requirements
COM Antenna
Meets TSO-C37( ) and C38( ) or TSO-C169( ). 50, vertically
polarized with coaxial cable
NAV Antenna
Meets TSO C40( ) and C36( ). 50, horizontally polarized with coaxial
cable. Note that if the NAV antenna is a combined VOR/LOC/GS
antenna, it must meet TSO C40( ), C36( ), and C34( ).
Glideslope Antenna
Meets TSO C34( ). 50, horizontally polarized with coaxial cable or
low-loss splitter used with the VOR/LOC antenna.
Headphones 500 nominal impedance
Microphone Low impedance, carbon or dynamic, with transistorized pre-amp
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