At switch(es) equipped with bolt lock but not an electric lock, the crew member must promptly _________ and then wait __________ before operating the switch(es)?

At switch(es) equipped with bolt lock but not an electric lock, the crew member must promptly _________ and then wait __________ before operating the switch(es)?

• A. unlock the bolt lock / 5 minutes
• B. prepare the bolt lock / 2 minutes
• C. remove the bolt lock / 5 minutes
• D. operate the bolt lock / 5 minutes

Answer: (D)

This tests the procedure for operating switches that have a bolt lock but no electric lock. The safe sequence is to promptly operate the bolt lock to release the lock, and then wait five minutes before operating the switch(es). The initial act of operating the bolt lock ensures the locking device is in the proper state, and the five-minute wait gives time for the switch mechanism and signaling to settle, reducing the chance of an improper or unexpected switch movement. The other options don’t fit because the required action is to operate (not just unlock, prepare, or remove) the bolt lock, and the mandated waiting period is five minutes, not two.

This tests the procedure for operating switches that have a bolt lock but no electric lock. The safe sequence is to promptly operate the bolt lock to release the lock, and then wait five minutes before operating the switch(es). The initial act of operating the bolt lock ensures the locking device is in the proper state, and the five-minute wait gives time for the switch mechanism and signaling to settle, reducing the chance of an improper or unexpected switch movement.

The other options don’t fit because the required action is to operate (not just unlock, prepare, or remove) the bolt lock, and the mandated waiting period is five minutes, not two.