Definition 1 of 2
Definition
A method of balancing a rotating component, such as a propeller, in which weight is added to or removed from a fixed, predetermined location on the part to bring it into balance. The correction points are built into the design and cannot be changed by the technician.
Plain English
A way to balance a spinning part where the spots used to add or remove weight are already decided by the manufacturer. The technician adjusts the weight at those exact spots, not anywhere they choose.
Context Anchor
Seen in air traffic control, route planning, arrival procedures, and departure flow discussions.
Derivation
The word 'fix' here means 'fixed in place' or 'unchangeable' — the balance points are set, not chosen freely. This contrasts with 'floating' or 'free' balancing, where the technician picks the correction location.
Why Pilots Care
Unbalanced rotation creates damaging vibration that shortens engine life and can loosen airframe parts.
Analogy
It is like sending cars to an event through several gates instead of forcing everyone through one entrance. The destination may be the same, but the flow is smoother.
Intuition Check
Do not read fix as repair here. A fix is a named point used for navigation. Do not read balancing as weight and balance here. It means spreading aircraft traffic more evenly.
Example Sentence 1
The propeller was returned to balance using fix balancing, with small weights added to the screw locations specified in the overhaul manual.
Example Sentence 2
After fix balancing the vibration disappeared and the engine ran smoothly at all RPMs.