Definition
The forward landing gear assembly on a tricycle-gear airplane, located under the nose of the aircraft and used together with the two main wheels to support the airplane on the ground, steer during taxi, and absorb landing loads on the front of the aircraft.
Plain English
The wheel under the nose of the airplane that, together with the two main wheels, lets the plane roll, steer, and land safely.
Context Anchor
In the Porpoising section, nose gear is important because a bouncing landing can drive the front wheel assembly into the runway and start or worsen the up-and-down motion.
Derivation
“Nose” means the front projecting part of something, and “gear” means equipment or working parts. In aviation, “nose gear” means the equipment at the front of the airplane that supports the nose on the ground.
Why Pilots Care
The nose gear is lighter and less robust than the main gear. Landing nose-first or letting the nose drop hard onto the runway can cause porpoising, damage the nose strut, or collapse the gear. Pilots are trained to touch down on the main wheels first and lower the nose gently.
Intuition Check
Do not read “gear” here as general equipment carried in the airplane. In this term, “gear” means part of the airplane’s landing system: the front wheel assembly that supports the nose.
Example Sentence 1
After touchdown on the main wheels, the pilot held back-pressure on the yoke to lower the nose gear gently to the runway.
Example Sentence 2
The nose gear steering allowed the pilot to keep the airplane centered on the taxiway after landing.