Lock preventing door opening unless platform is positioned.

• A. Mechanical Lock
• B. Travel Limit
• C. Annual Governor Test
• D. Tripping Speed

Answer: (A)

This is about the device that actually blocks access to the landing door until the platform is safely in position. A mechanical lock is a physical locking element tied to the platform’s position. When the platform isn’t in the proper alignment, the lock stays engaged, preventing the door from opening and keeping you away from moving parts. Once the platform is correctly positioned, the lock releases so the door can open safely. The other options aren’t about preventing door access: a travel limit deals with how far the platform can move; a governor test and tripping speed relate to speed-safety devices, not to locking the door.