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3 L
IMITATIONS
3.1 O
PERATION
The installation of a GDL 90 into an aircraft does not alter the operational approvals previously granted
to that aircraft. Additional operation approvals may require FAA evaluation of all the systems installed
in a particular aircraft and is outside the scope of the GDL 90 STC.
3.2 I
NSTALLATION
The conditions and test 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.
If the aircraft with a GDL 90 installed operates outside the state of Alaska, the system must be configured
to disallow the Capstone squawk code features. This is done by configuring the APM to disable
Capstone feature (Section 4.2.1.2). In addition, if installed, the MX20 should also be configured to
inhibit the entering of squawk code (The transponder should be the only source to enter squawk code.)
The TCAS interface is not currently approved for installation or use. The micro APM shall be configured
with TCAS not installed.
3.2.1
GPS A
NTENNA
The GDL 90 is only compatible with the Garmin AT A-33 (590-1104) or A-34 (590-1112) antennas, or
those with equivalent specifications. Refer to section 1.3.7.1 for specifications.
Testing has demonstrated GDL 90 compatibility with SatCom installation in the aircraft, if cable loss is
as specified Section 2.6.1.
3.2.2
UAT A
NTENNA
The GDL 90 requires at least one UHF antenna meeting the following specifications:
Standard 50 vertically polarized antenna with a VSWR < 1.7:1 at 978 Mhz
TSO-C66, C74, C112 or C154 antennas that also meet the VSWR specification
Operating the GDL 90 with no RF terminations on the Top or Bottom UAT Antenna
ports can result in equipment damage. Always operate the GDL 90 with the Top and
Bottom UAT Antenna ports terminated with a VSWR ratio of 3.0:1 or less.
3.2.3
A
NTENNA
Antenna installation in the pressure vessel of pressurized aircraft is beyond the scope of the GDL 90
STC. Additional manufacturer's data may be necessary and FAA approval may be required to cover the
installation of any antenna in the pressure vessel of a pressurized aircraft.
GDL 90 Installation Manual
CAUTION
I
– G
NSTALLATION
560-1049-00 Rev B
Post-Installation Configuration & Checkout
ENERAL
3-1
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