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.
Plain English
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.
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.