12.7.1 A main electric lighting system which should
provide illumination throughout those spaces and parts of the craft
normally accessible to and used by passengers or crew should be supplied
from the main source of power.
12.7.2 Arrangement of the main lighting system
should be such that a fire or other occurrences in the space containing
the main source of power will not render the emergency lighting system
inoperative.
12.7.3 The intensity of the main lighting system
should be adequate to provide:
-
(a) the control of all essential machinery and
arrangements:
-
(b) legibility of all identification inscriptions;
-
(c) reading of all indicating and recording instruments;
and
-
(d) clear visibility inside all spaces used by
passengers and crew.
12.7.4 Emergency lighting should come into operation
automatically in the event of failure of the main supply and should
be adequate to facilitate the evacuation of the passengers and crew.
The Administration should take account of the fact that escape routes
may have reduced visibility due to smoke, steam, etc.