Definition
A helicopter flight control, usually a lever located on the left side of the pilot's seat, that simultaneously changes the pitch angle of all main rotor blades by the same amount. Raising the collective increases blade pitch on every blade together, which increases lift and causes the helicopter to climb; lowering it decreases blade pitch and causes the helicopter to descend.
Plain English
The lever a helicopter pilot pulls up to go up and pushes down to go down. It changes the angle of all the rotor blades at the same time, by the same amount, so the helicopter rises or settles as a whole.
Context Anchor
You encounter this term in helicopter flight controls, rotor system descriptions, maintenance rigging, and pilot discussions of takeoff, hover, climb, and descent.
Derivation
Collective' comes from the Latin 'colligere', meaning 'to gather together'. The name fits because this control gathers all the rotor blades and adjusts them as one group, rather than individually.
Why Pilots Care
Directly governs vertical speed and hover height; incorrect movement can cause rapid altitude loss or rotor RPM decay.
Grounding Statement
When the pilot raises the collective pitch control, all main rotor blades increase their angle together and the helicopter produces more lift.
Intuition Check
Do not read collective as a shared control used by several people. Here, collective means the control changes all main rotor blades together. Do not read pitch as the nose-up or nose-down attitude of the aircraft. Here, pitch means the angle of the rotor blades.
Example Sentence 1
The pilot raised the collective pitch control smoothly to lift the helicopter into a hover.
Example Sentence 2
During hover, the pilot made small inputs to the collective pitch control to hold altitude against wind gusts.