What is the time delay for an unmanned space?

• A. 60 seconds
• B. 45 seconds
• C. 30 seconds + or - 10
• D. 30 seconds + or - 5

Answer: (D)

The time delay for an unmanned space is the fixed period before automatic protective actions are taken in a space that has no crew on watch. This delay must be short enough to respond promptly, but precise enough to avoid acting on transient readings.

The best option sets the delay at 30 seconds with a tolerance of plus or minus 5 seconds, giving a 25–35 second window. This tighter tolerance ensures consistent, predictable operation across different equipment and conditions, which is crucial for unmanned spaces. A longer delay would slow response to real problems, and a wider tolerance (like ±10) would make the timing less reliable.