Definition
An in-flight event in which the airplane departs from its intended flight path in a manner the pilot did not command and is unable to readily correct, typically involving an unintended deviation in attitude, airspeed, or trajectory beyond normal flight parameters. LOC-I commonly results from aerodynamic stalls, spins, spatial disorientation, or flight outside the airplane's normal operating envelope, and is a leading cause of fatal general aviation accidents.
Plain English
The pilot is no longer flying the airplane the way they meant to, and the airplane has gotten away from them — wrong attitude, wrong speed, or wrong path — and they can't quickly recover it.
Context Anchor
Seen in discussions of stalls, upsets, accident prevention, and basic airplane control in the Airplane Flying Handbook.
Why Pilots Care
LOC-I remains the leading cause of fatal general aviation accidents; early recognition and prompt recovery prevent most incidents from becoming unrecoverable.
Grounding Statement
The key idea is simple: the airplane is flying, but it is no longer responding in a controlled way to produce the path the pilot wants.
Intuition Check
LOC-I does not mean the pilot has made a small heading or altitude error. It means control of the airplane’s flight path, speed, or nose-and-wing position has been seriously lost or is being lost.
Example Sentence 1
The accident report listed the cause as LOC-I following an aerodynamic stall on the base-to-final turn.
Example Sentence 2
Training emphasizes prevention of LOC-I by maintaining coordinated flight and avoiding excessive bank angles at low airspeeds.