190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page 2-1
2 LIMITATIONS
2.1 Installation
Conditions and tests required for TSO approval of this article are minimum performance standards. It is the
responsibility of those installing this article either on or within a specific type or class of aircraft to
determine that the aircraft installation conditions are within the TSO standards. TSO articles must have
separate approval for installation in an aircraft. The article may be installed only if performed under
14 CFR Part 43 or the applicable airworthiness requirements.
To mitigate against the loss of navigation and communication, installation of a second navigation and/or
communication system may be required.
2.2 Aircraft Radio
An aircraft radio station license is not required when operating in U.S. airspace, but may be required when
operating internationally.
As required by TSO-C169a, the quantitative safety objective for the VHF COM radio in the GTR/GNC is
1 x 10
-4
per flight hour for Class I Part 23 airplanes, and 1 x 10
-5
per flight hour for all other Part 23 and
Part 27 aircraft. To meet requirements for Part 23 Class II, Class III and Class IV, and Part 27 aircraft, it
may be necessary to install a second VHF communications radio.
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