Definition
A mechanical arrangement in which two or more simple levers are linked together so that the output of one lever becomes the input force for the next, multiplying the mechanical advantage beyond what a single lever could provide.
Plain English
Two or more levers connected in series so each one adds to the force of the one before it, letting a small effort move or hold a much larger load.
Context Anchor
Seen in aircraft maintenance descriptions of control systems, brake systems, landing gear systems, and other mechanical systems that use connected moving parts.
Derivation
Compound comes from the Latin componere, meaning to put together. A compound lever is literally several levers put together to work as one system.
Why Pilots Care
It lets a pilot or mechanic apply far more force than a single lever could provide, which is essential for reliable braking and control surface movement.
Intuition Check
Do not read compound here as a chemical mixture. In this term, compound means “made of connected parts working together.”
Example Sentence 1
The toe brake system uses a compound lever arrangement to turn a light push on the pedal into enough force to clamp the brake disc.
Example Sentence 2
During rigging, the mechanic checked the compound lever in the aileron linkage to confirm full travel with minimal stick force.