Definition
The maintenance procedure of checking and adjusting the rotor blades of a helicopter, or the propeller blades of a fixed-wing aircraft, so that all blades follow the same path through the air as they rotate. When blades are out of track, one or more blades fly a slightly higher or lower path than the others, producing vibration.
Plain English
Making sure every blade on a rotor or propeller travels along exactly the same circular path as it spins. If one blade rides higher or lower than the rest, the aircraft shakes.
Context Anchor
Seen during propeller and rotor maintenance, especially when checking vibration, blade alignment, or after blade installation.
Derivation
From 'track,' meaning the path something follows. Each blade leaves an invisible 'track' in the air as it rotates; tracking checks whether all blades share the same path.
Why Pilots Care
Correct blade tracking eliminates vibration that can fatigue airframe components and degrade handling.
Analogy
It is like watching the rim of a bicycle wheel spin. If part of the rim rises or dips as it turns, it is not following one clean path.
Intuition Check
Blade tracking is not about tracking where the aircraft is going. It is about checking the path the blade tips make as they rotate.
Example Sentence 1
After replacing the main rotor blades, the mechanic performed blade tracking to eliminate a vibration the pilot had reported.
Example Sentence 2
Vibration reduced noticeably once blade tracking was corrected during the post-maintenance check.