Definition
Unplanned landings made necessary by an emergency, such as engine failure or other condition that prevents continued flight, requiring the pilot to land the airplane immediately at the most suitable site available, regardless of whether it is an airport.
Plain English
A landing the pilot has no choice about. Something has gone wrong with the airplane and it must be put down on the ground as soon as possible, often in a field or other off-airport area.
Context Anchor
Seen in emergency approach discussions and in intentional slip training, where a slip may help the pilot lose extra altitude without gaining speed when approaching a chosen landing area.
Derivation
From 'force,' meaning compelled or required by circumstance. The pilot is not choosing to land — the situation is forcing it.
Why Pilots Care
Choosing the right site and using proper technique such as a slip can prevent serious injury or aircraft damage when power is lost.
Analogy
Like pulling your car onto the nearest shoulder the moment the engine quits instead of driving to the next exit.
Intuition Check
Do not read forced as rough or uncontrolled. Here it means required by the situation: the pilot still flies the airplane deliberately, but the flight cannot safely continue.
Example Sentence 1
After the engine lost power, the pilot set up a glide and prepared for a forced landing in an open pasture.
Example Sentence 2
Selecting a suitable field early is the first step in any forced landing procedure.