Definition
Operating an aircraft under Instrument Flight Rules with only one pilot on board, meaning that pilot must handle all flying, navigation, communication, system management, and decision-making tasks without a second crewmember to share the workload.
Plain English
Flying in the clouds or low-visibility conditions by yourself, with no co-pilot to help. You do everything: fly the airplane, talk on the radio, read the charts, and make all the decisions.
Context Anchor
Seen in discussions of aircraft equipment, certification, and instrument flying capability.
Why Pilots Care
Single pilot IFR is one of the highest-workload environments in general aviation. Without a second pilot to back you up, small mistakes compound quickly, and good planning, automation, and discipline become essential to staying safe.
Intuition Check
Single pilot IFR does not mean single-engine. It means one pilot is operating under instrument flight rules without a required second pilot.
Example Sentence 1
He briefed the approach carefully before descending into the overcast, knowing single pilot IFR left no one else to catch a missed step.
Example Sentence 2
The airplane must be equipped with an autopilot for legal single pilot IFR in many cases.