190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. B Page 1-1
1 GENERAL DESCRIPTION
1.1 Introduction
This manual is intended to provide mechanical and electrical information for use in the planning and
design of an installation of the GTR 225, GTR 225A, GTR 225B, GNC 255A, or GNC 255B into an
aircraft. 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 practices. This manual is not intended for use by individuals who do not
possess the competencies and abilities set forth above. Refer to Section 2, Limitations, for additional
information and other considerations.
1.2 Equipment Description
Table 1-1. TSO-Certified Units
The GTR/GNC units have a display that is coated with a special anti-reflective coating
that is very sensitive to waxes and abrasive cleaners. CLEANERS CONTAINING
AMMONIA WILL HARM THE ANTI-REFLECTIVE COATING. It is very important to
clean the display using a clean, lint-free cloth and an eyeglass lens cleaner that is
specified as safe for anti-reflective coatings.
The use of ground-based cellular telephones while aircraft are airborne is prohibited by
FCC rules. Due to potential interference with onboard systems, the use of ground-based
cell phones while the aircraft is on the ground is subject to FAA regulation 14 CFR §91.21.
FCC regulation 47 CFR §22.925 prohibits airborne operation of ground-based cellular
telephones installed in or carried aboard aircraft. Ground-based cellular telephones must
not be operated while aircraft are off the ground. When any aircraft leaves the ground, all
ground-based cellular telephones on board that aircraft must be turned off. Ground-based
cell phones that are on, even in a monitoring state, can disrupt GPS/SBAS performance.
Model Part Number NAV Receiver
TX Power
(Watt)
8.33 KHz
Spacing
25 KHz
Spacing
GTR 225 011-02718-00 N/A 10 N/A Yes
GTR 225A 011-02807-00 N/A 10 Yes Yes
GTR 225B 011-02808-00 N/A 16 Yes Yes
GNC 255A 011-02806-00 Yes 10 Yes Yes
GNC 255B 011-02719-00 Yes 16 Yes Yes
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