4 INSTALLATION
The ST3400 should be installed in accordance with standards established by the
customer’s installing agency, and existing conditions as to unit location and type
of installation.
4.1 Unpacking and Inspecting Equipment
Exercise extreme care when unpacking the equipment. Make a visual inspection
of the unit for evidence of damage incurred during shipment. If a claim for
damage is made, save the shipping container to substantiate the claim. The claim
should be promptly filed with the carrier. It would be advisable to retain the
container and packaging material after all equipment has been removed in the
event that equipment storage or reshipment should become necessary.
4.2 Cooling Considerations
The ST3400 contains its own ventilation fan for internal component cooling and
does not require a forced air cooling system. However, it is extremely important
that the perforated area at the four corners (air intakes) be kept clear of any
objects which would restrict the inflow of air at cabin ambient temperature.
Cooling should be verified in the post-installation checkout by monitoring the
temperature on the Diagnostics 1 page.
For additional cooling or special requirements, air from an external avionics
blower may be directed near the corner air inlets.
In helicopter installations it may be desirable to introduce a small amount of
cooled (air conditioner) air into the avionics bay if it is completely sealed. In
these installations it is not uncommon for the internal ambient temperature of the
avionics bay to exceed the ratings of the equipment if cooling air is not supplied.
4.3 Mechanical Installation Considerations
4.3.1 Instrument Location in the Cockpit
The Sandel ST3400 is a direct replacement for a currently installed RMI.
Installation should conform to customer requirements and airworthiness standards
affecting the location and type of installation.
4.3.2 Assembly and Mounting Instructions
Refer to the ST3400 Installation Diagrams for specific assembly and mounting
instructions and appropriate notes.
82002-IM-L ST3400 INSTALLATION MANUAL
4-1
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