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Indoor installation
• Locate the unit away from GPS and radio equipment to avoid mutual interference.
• The lead-in wire should be as near to the unit as possible.
• Select a place where the unit can be easily maintained, but where it will not interfere with
crew or passengers.
• Overhead mounting is available for indoor installation.
1.2.4 Anti-moisture measure (vent tube)
The vent tube (attached) prevents moisture from being drawn into the enclosure during
atmospheric pressure changes and allows trapped humid air to escape. Install it according to
coupler installation method, before mounting coupler.
Vertical or horizontal installation
Two vent holes are provided on the coupler, one at the bottom and one on the rear. The vent
tube is set to vent hole B at the factory. This location is for vertical installation of the coupler. For
horizontal installation, remove the vent tube from vent hole B and set it to vent hole A. Cover
vent hold B with seal (supplied), from inside the coupler.