GDL 90 System ICA, Helicopter STC
Garmin AT
2345 Turner Rd SE
21 December 2005
Salem, OR 97302
Part #: 560-0255-00 Rev A
©
Copyright 2005 Garmin AT All Rights Reserved
Page 10 of 13
If the GDL 90 unit is removed and reinstalled, verify that the GDL 90 unit power-up self-test
sequence is successfully completed and that no failure messages are annunciated on any
interfaced controller or MFD.
If the GDL 90 unit is removed for repair and reinstalled, or if the GDL 90 unit is removed and
replaced with a different GDL 90 unit, then follow ‘Equipment Setup and Configuration’
procedures contained in the GDL 90 Installation Manual listed in paragraph 2.1 of this
document, and verify that the GDL 90 unit power-up self-test sequence is successfully
completed and that no failure messages are annunciated on any interfaced controller or MFD.
If any work has been done on the aircraft that could affect the system wiring, antenna cable, or
any interconnected equipment, verify that the GDL 90 unit power-up self-test sequence is
successfully completed and that no failure messages are annunciated on any interfaced controller
or MFD.
GSL 71
To remove the GSL 71 from the mounting frame, use the 3/32 hex tool described in Section 2.14
and turn the tool counterclockwise. The unit will be pushed out of the frame by the cam lock
assembly. No special extraction tools are required.
To install the GSL 71 in the mounting frame, make sure the cam lock is rotated so the rear part is
up, then slide the unit into the frame and tighten with the 3/32 hex tool. The unit will be pulled
into the frame by the cam lock and the connector will fully engage.
If the GSL 71 unit is removed and reinstalled, verify that the GSL 71 unit power-up self-test
sequence is successfully completed and that no failure messages are annunciated on any
interfaced MFD.
2.9
General Procedural Instructions
GDL 90 and GSL 71 system tests conducted during ground running are described in ‘Post
Installation Checkout’ procedures contained in the GDL 90 and GSL 71 Installation Manuals
listed in paragraph 2.1 of this document.
Procedures and data required for structural maintenance are described in the ‘Equipment
Mounting’ and/or ‘Installation Considerations’ and sections in the appropriate Installation
Manuals as detailed in Section 2.1.
Weight and balance computation may be required after maintenance of the GDL 90 System
installation. Follow the guidelines as established in AC 43.13-1B, Chapter 10, Section 2. Make
appropriate entries in the equipment list indicating items added, removed, or relocated along
with the date accomplished. Include your name and certificate number in the aircraft records.
Table 2 identifies the weight of the GDL 90 System equipment. Table 3 lists the expected center
of gravity for GDL 90 System equipment as installed in various rotorcraft.
