4.1 The aggregate width of stairway exit doors
to the muster station should not be less than the aggregate width
of stairways serving this deck.
4.2 The areas of landings at each deck level required
by Regulation II-2/28.1.5.5 should
be based on the total number of persons (Z) expected
to be evacuated in accordance with Regulation
II-2/28.1.5.5 and should be considered prior to the calculations
of the stairway width “W”.
4.3 Means of escape plans should be provided indicating
the following:
-
.1 the number of crew and passengers in all normally
occupied spaces;
-
.2 the number of crew and passengers expected
to escape by the stairway and through doorway, corridors and landing;
-
.3 muster stations and survival craft embarkation
positions;
-
.4 primary and secondary means of escape;
-
.5 widths of stairways, doors, corridors and landing
areas.
4.4 Means of escape plans should be accompanied
by detailed calculations for determining the width of escape stairways,
doors, corridors and landing areas.