CTD door are shell doors used to open the Scientific hangar on scientific research vessels.
They can be opening outside or inside, single opening or double opening with independent upper door for the CTD crane, custom designed based on CTD Crane.
In the closed position, they are recessed into the vessel flush and aligned with the surrounding shell plate.
The rotational movement is obtained by means of double-acting hydraulic cylinder or electrical actuators; hydraulic doors are powered by HPP - hydraulic power pack, electric doors are powered by ship electrical power line.
Door signals are sent to wheelhouse with dry contacts and can be interlocked with CTD Crane.