General Description; Introduction; Equipment Description; Table 1-1 Tso-Certified Units - Garmin GTR 225 Installation Manual

1 GENERAL DESCRIPTION

1.1

Introduction

Information for the installation of a GTR 225, GTR 225A, GTR 225B, GNC 255A, or GNC 255B is
provided in this manual. This manual is not a substitute for an approved airframe-specific maintenance
manual, installation design drawing, or complete installation data package. Attempting to install
equipment by reference to this manual alone and without first planning or designing an installation specific
to your aircraft may compromise your safety and is not recommended. The content of this manual assumes
use by competent and qualified avionics engineering personnel and/or avionics installation specialists
using standard aviation maintenance practices in accordance with Title 14 of the Code of Federal
Regulations and other relevant accepted
considerations.
1.2

Equipment Description

Model P/N
GTR 225 011-02718-00
GTR 225A 011-02807-00
011-02808-00
GTR 225B
011-02808-20
GNC 255A 011-02806-00
011-02719-00
GNC 255B
011-02719-20
The GTR 225 and GNC 255 Series units are a family of 6.25" wide, 1.65" tall panel-mounted VHF COM
and NAV/COM radios.
The GTR 225 Series include an airborne VHF communications transceiver. The GTR 225 Series meet the
requirements of the TSOs specified in table 1-10. A summary of system functions is located in table 1-11
and operating instructions are found in GTR 225/GTR 225A/GTR 225B Pilot's Guide. Differences between
the GTR 225 models are listed in table 1-1.
The GNC 255 Series include all the features of the GTR 225 Series in addition to airborne VOR/localizer
(LOC) and glideslope (G/S) receivers. The GNC 255 Series meet the requirements of the TSOs specified
in table 1-10. A summary of system functions is located in table 1-11 and operating instructions are found
in GNC 255A/GNC 255B Pilot's Guide. Differences between the GNC 255 models are listed in table 1-1.
190-01182-02
Rev. F
practices. See section 2 for additional information and other

Table 1-1 TSO-Certified Units

NAV TX Power
Receiver (Watt)
N/A 10
N/A 10
N/A 16
N/A 16
Yes 10
Yes 16
Yes 16
GTR 225/GNC 255 TSO Installation Manual
8.33 kHz 25 kHz
Spacing Spacing
N/A Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Notes
NVIS-B
Compatible
NVIS-B
Compatible
Page 1-1