What statement is true concerning the door interlock devices associated with a winding drum or traction drive passenger elevator onboard ship? |
A) Door interlocks are used to prevent elevator operation if the doors are still open and only allow elevator operation if the doors are proved closed. |
B) Door interlocks are used to prevent elevator operation if the doors are still closed and only allow elevator operation if the doors are proved open. |
C) Door interlocks are used to prevent elevator operation in a shipboard emergency when elevators are not to be used. |
D) Door interlocks are used to over-ride elevator emergency status in a shipboard emergency when elevators are required to be used. |