Definition
In the context of the Vertical Speed Indicator (VSI), climbing refers to the aircraft gaining altitude over time, indicated by an upward deflection of the VSI needle showing a positive rate of vertical movement, typically measured in feet per minute.
Plain English
The aircraft is going up — moving to a higher altitude. On the VSI, this shows as the needle pointing above zero.
Context Anchor
Seen on the Vertical Speed Indicator during climbs, instrument scans, and altitude changes.
Why Pilots Care
Knowing whether the aircraft is climbing, descending, or level is fundamental to controlling altitude. The VSI confirms what the altimeter is showing and helps the pilot establish and hold a desired rate of climb.
Intuition Check
Climbing does not mean the nose is merely pointed up. It means the aircraft is actually gaining altitude.
Example Sentence 1
The VSI showed the aircraft climbing at 500 feet per minute after takeoff.
Example Sentence 2
During the missed approach, the pilot established a steady climbing indication on the VSI before turning.