Plain English Meaning
A pump driven by the engine that moves air through the aircraft's air-powered systems, such as the rubber boots that inflate to crack ice off the wings.
Full Definition
An engine-driven pump that supplies the airflow used by certain aircraft systems, including pneumatic deice boots on the wings and tail. It either pulls air in (suction/vacuum) or pushes it out (pressure), depending on system design, providing the air pressure needed to inflate and deflate the boots that break ice off the leading edges.
Context Anchor
Seen in airfoil anti-ice and deice discussions, especially when describing how pneumatic deicing boots inflate during icing conditions.
Derivation
Pneumatic comes from the Greek 'pneuma,' meaning breath or air. A pneumatic pump is therefore an air pump — it works by moving air rather than liquid or electricity.
Why Pilots Care
Keeps ice protection systems working so the wings maintain lift in icing conditions.
Analogy
It is like a controlled aircraft version of a bicycle pump: it moves air into something so that it expands, but it is connected to a specific aircraft system instead of a tire.
Intuition Check
Do not read “pneumatic pump” as just any pump on the aircraft. “Pneumatic” means the pump’s job is to move air for an air-powered system.
Example Sentence 1
Before launching into icing conditions, the pilot confirmed the pneumatic pump was operating normally so the deice boots would inflate when needed.
Example Sentence 2
During the preflight check the pilot confirmed the pneumatic pump was operating normally.