In split duty, the rest period may not be shorter than the scheduled time.

• A. Rest must not be shorter than the scheduled time.
• B. Rest can be shorter if needed.
• C. Rest must be longer than the scheduled time.
• D. Rest length is irrelevant.

Answer: (A)

Split duty is designed to protect fatigue management by ensuring a solid recovery between duty blocks. The rule requires that the rest period between segments cannot be shorter than the scheduled duty time, meaning rest must be at least as long as the time spent on duty. This minimum rest safeguards alertness and performance, preventing too-brief recovery that could compromise safety. Rest shorter than the scheduled time would weaken recovery and isn't allowed, while rest longer than the scheduled time may occur in some schedules but isn’t the stated requirement. Rest length being irrelevant would ignore essential safety rules for fatigue management.