5.3.1 A skylight should be of efficient weathertight
construction and should be located on the centre line of the vessel,
or as near thereto as practicable, unless it is required to provide
a means of escape from a compartment below deck.
5.3.2 When a skylight is an opening type it should
be provided with efficient means whereby it can be secured in the
closed position.
5.3.3 A skylight which is provided as a means
of escape should be capable of being opened from both sides.
5.3.4 Unless the glazing material and its method
of fixing in the frame is equivalent in strength to that required
for the structure in which it is fitted, a portable "blank" should
be provided which can be efficiently secured in place in event of
breakage of the glazing.