Definition
An immediate indication of the direction in which an aircraft state — such as airspeed, altitude, attitude, or heading — is changing. On instruments, the trend is shown by the rate and direction of needle or tape movement, before the actual value has changed significantly.
Plain English
Which way an instrument reading is heading right now, and how fast — not where it is, but where it's going.
Context Anchor
Seen when reading flight instruments, especially displays that show whether speed, altitude, vertical movement, or heading is changing.
Derivation
From the Old English 'trendan,' meaning 'to turn or roll.' The sense of 'general direction of movement' carried into English usage. In aviation, it keeps that same idea — which way things are turning or moving right now.
Why Pilots Care
Lets the pilot anticipate and correct small changes before they become large deviations.
Intuition Check
Do not read trend here as a long-term pattern over minutes or days. In instrument flying, it means the immediate direction a reading is moving right now.
Example Sentence 1
He noticed an upward trend on the altimeter and reduced pitch slightly to hold altitude.
Example Sentence 2
Watching the altitude trend helped keep the aircraft level during the approach.