Definition
A category of in-flight event in which the pilot is unable to maintain or regain control of the airplane along its intended flight path. LOC-I typically results from the airplane departing controlled flight — for example through an aerodynamic stall, spin, spiral, or upset — and is a leading cause of fatal accidents in general aviation.
Plain English
The airplane stops doing what the pilot is telling it to do, and the pilot can't get it back on track in time. It usually happens when the wing stops flying properly or the airplane ends up in an unusual attitude the pilot can't recover from.
Context Anchor
Seen in accident prevention, energy management, stall awareness, and maneuvering discussions.
Derivation
“Loss of control” uses ordinary words, but in aviation it has a specific safety meaning: the aircraft is no longer responding in a controlled, intended way. “In-flight” narrows it to the airborne part of the flight, not taxi, takeoff roll, or landing rollout on the ground.
Why Pilots Care
LOC-I remains the leading cause of fatal general aviation accidents; recognizing the early signs allows a pilot to recover before the situation becomes unrecoverable.
Grounding Statement
A typical LOC-I scenario is an airplane getting too slow or too steeply banked, then departing from the flight path the pilot intended.
Intuition Check
LOC-I does not mean the pilot is slightly off course or having a rough moment. It means control of the airplane in the air has been seriously lost or is being lost.
Example Sentence 1
The accident report identified LOC-I following an aerodynamic stall during a low-altitude turn from base to final.
Example Sentence 2
After the pilot over-controlled during recovery from a steep turn, the aircraft entered an uncommanded roll that met the definition of LOC-I.