What statement is true concerning the platform interlock devices associated with a winding drum or traction drive cargo elevator onboard ship?

Correct Answer: Option B — Platform interlocks are used to prevent door operation if the platform is at other than a deck level and only allow door operation when the platform is proved at a deck level.

Under USCG National Maritime Center examination standards, the accepted correct answer is: Platform interlocks are used to prevent door operation if the platform is at other than a deck level and only allow door operation when the platform is proved at a deck level..