Garmin GDL 69/69A Installation Manual - Page 51

Limitations 6 LIMITATIONS 6.1 Operation The installation of a GDL 69/69A into an aircraft does not alter the operation approvals previously granted to the aircraft. Additional operation approvals may required FAA evaluation of all systems installed in a particular aircraft and is outside the scope of the GDL 69/69A STC. Any higher priority audio cautions or alerts, such as the stall warning or gear warning, must disable XM audio to crew locations by muting the GDL 69A XM audio with the use of the audio suppression discrete inputs on the GDL 69A. 6.2 Installation The GDL 69A XM Satellite Radio audio entertainment may be installed to all passenger locations for all aircraft on the STC Approved Model List (AML). XM audio entertainment to crew locations depends on aircraft installation, which must meet requirements of 14 CFR §23.1431(e). For purpose of this STC, 14 CFR §23.1431(e) requires that each pilot station must be able to hear the aircraft's stall warning horn with the entertainment system audio set to the maximum pilot controllable setting. This also applies to aircraft with a gear extension warning horn. Aircraft which have electric stall/gear warning may utilize the GDL 69A audio suppression input to turn off the music during an event. For these installations, the XM audio may be provided to the crew locations. For aircraft installations with non-electric stall/gear warning horns, this STC does not provide data for installation of audio entertainment to crew locations. The GDL 69A audio entertainment may not be wired to crew locations without a separate evaluation that is beyond the scope of this STC. It is possible for installers to seek evaluation and approval of an alternate installation by means of the field approval process. In both cases, each installation or aircraft type must be evaluated for compliance with 14 CFR §23.1431(e). This evaluation may determine that the required horns can be heard satisfactorily without disabling the GDL 69A audio entertainment to the crew. NOTE For installations with non-electric stall warnings, the installer may attenuate the GDL 69A audio provided to crew locations to assist meeting the requirements of 14 CFR §23.1431(e). The GDL 69A audio output may be attenuated by installing series resistors per Figure D-6. For preservation of essential equipment in aircraft with multiple power busses, the GDL 69/69A should be powered from a non-essential bus. 6.2.1 Antenna The GDL 69/69A is compatible with the Garmin antennas listed in Table 1-5 or those with equivalent specifications. Refer to Table 1-7 for specifications. 6.2.2 Equipment Interfaced to the GDL 69/69A Any aircraft systems, other than those shown in this installation manual, that interface to the GDL 69/69A are outside the scope of this manual and may require further evaluation and/or certification approval. All equipment interfaced to the GDL 69/69A must be previously or concurrently approved. 6.2.3 Preservation of Previous Systems It is the installer's responsibility to preserve the essential characteristic of the aircraft being modified by this manual to be in accordance with the aircraft manufacturer's original design. This includes the preservation of multiple power buses, which reduce the probability of interrupting power to essential instruments and avionics. The GDL 69/69A is non-essential equipment and as such, if an option to power the unit from a non-essential bus is available, it must be used. GDL 69/69A Installation Manual 190-00355-02 Page 6-1 Revision E