Definition
Small, automatic control inputs made by a helicopter's stabilization or automatic flight control system to oppose the rate at which the aircraft is moving about an axis (pitch, roll, or yaw). The system senses how quickly the helicopter is rotating and applies a corrective input proportional to that rate, slowing the motion and reducing oscillation without holding a fixed attitude.
Plain English
The autopilot or stability system feels how fast the helicopter is starting to tip or turn and pushes back gently to slow it down. It doesn't hold the helicopter still — it just takes the sharp edge off any movement so the aircraft feels steadier.
Context Anchor
Seen in helicopter instrument procedures when describing how stabilization and automatic flight control systems help reduce pilot workload and keep the helicopter steady.
Derivation
‘Damping’ comes from the same idea as a shock absorber on a car — something that reduces the size and speed of an oscillation. ‘Rate’ here means the speed of rotation (degrees per second). So a ‘rate damping’ input is one that pushes against how fast the aircraft is moving, not against where it currently is.
Why Pilots Care
Reduces over-control tendencies and pilot workload in instrument conditions while improving stability.
Analogy
Rate damping is like a shock absorber on a vehicle. It does not choose where the vehicle goes; it smooths out sudden motion so the ride stays controlled.
Grounding Statement
If the helicopter’s nose starts moving up too quickly, the system can make a small opposite input to slow that motion before it becomes a larger movement.
Intuition Check
Rate does not mean airspeed here, and damping does not mean stopping all movement. It means the system reacts to how quickly the helicopter is rotating and adds small smoothing inputs.
Example Sentence 1
The AFCS provides rate damping control inputs to reduce short-term oscillations in pitch and roll, making the helicopter easier to fly on instruments.
Example Sentence 2
With rate damping active, small cyclic movements produced smooth attitude changes rather than oscillations.