Hatch assembly

A hatch assembly comprising:

• a frame presenting a frame opening;
• a hatch for opening and closing the frame opening;
• a plurality of pivot assemblies, wherein at least two pairs of the pivot assemblies each provide a hatch pivot axis at or adjacent a side of the hatch,
• an engagement mechanism configured to releasably engage the pivot assemblies to couple the hatch to the frame;
• wherein the engagement mechanism comprises a plurality of pins, each pin movable between an extended position to engage a said pivot assembly and a retracted position to disengage from the pivot assembly;
• and
• an actuation mechanism configured to move the pins between the extended and retracted positions, to selectively couple the hatch to the frame by:
• (i) all of the pivot assemblies engaged by all of the pins to couple the hatch to the frame in a closed position, and
• (ii) any said pair of pivot assemblies engaged by a corresponding pair of the pins to selectively pivotally-couple the hatch to the frame to pivot on the hatch pivot axis at or adjacent any of at least two sides of the hatch, and
• wherein the pins are oriented so that longitudinal axes of the pins in each pair of pins converge enabling the hatch to remain coupled to the frame when the hatch is pivoted between the closed position and an open position.