Definition
A flight crew duty period that is broken into two segments by a scheduled rest opportunity on the ground, allowing the crew to extend the total duty day under specific regulatory conditions. Used primarily in Part 117 air carrier operations, the rest break must meet minimum length and suitable accommodation requirements before the second duty segment may begin.
Plain English
A working day that is split into two parts by a planned rest break in the middle, so the crew can legally fly a longer overall day.
Context Anchor
Seen in crew scheduling, fatigue management, and duty-time discussions for commercial flight operations.
Derivation
Split means divided into parts; duty here means the on-the-clock work period for a flight crew. The phrase describes a duty period literally split in two by an in-between rest.
Why Pilots Care
It lets operators extend total duty time while still providing rest, reducing the chance of exceeding legal limits or accumulating fatigue.
Intuition Check
Split duty does not mean two completely separate duty days. It means one scheduled assignment has a planned rest break in the middle, and the rules determine how that break counts.
Example Sentence 1
The crew was scheduled for a split duty assignment, with a four-hour rest period in a quiet hotel room between the morning and evening flights.
Example Sentence 2
Because the rest period met the minimum, the split duty allowed the crew to complete both legs within the extended duty window.