Connecting a ventilation pipe to the air bleeding cock
Air inside the installation trunk may damage the transducer. The hull unit mounting flange is provided with an dedicated cock to release any trapped air from inside the trunk.
Prerequisites
The shipyard must provide all necessary tools and manpower. The following specific item is required for this task.
•  Ventilation pipe (The minimum diameter is 1/4" (6.35 mm).)
The following special tools are required for this task:
•  Plumbing tools
Image
A Ventilation pipe
B Pipe thread
C Valve shown in opened position
Procedure
1 Mount a ventilation pipe to the air bleeding cock.
2 Run this ventilation pipe with a continuous rise to the main deck or out through the vessel's side.
3 Open the air bleeding cock on the hull unit mounting flange.