The AA442CW is a FAA-PMA approved engine-driven dry air vacuum pump used in general aviation aircraft as an alternative replacement for the standard 442CW vacuum pump.

It is designed to power aircraft vacuum systems that drive instruments such as attitude indicators and heading gyros, providing reliable suction without the need for external lubrication (dry design).

Key features include:

FAA-PMA certified dry air vacuum pump
Direct replacement for 442CW series pumps
Engine-driven (mounts on accessory case)
“Dry air” design (no internal oil lubrication system)
Improved stator porting for airflow efficiency
Bi-polar rotor design for balanced loading and reduced wear
Heat-treated internal components for long service life
Designed to reduce FOD risk and vane sticking
Built for general aviation aircraft vacuum systems
Commonly used in Beechcraft, Cessna, and Piper vacuum-driven instrument systems 
This pump is widely used in legacy aircraft vacuum systems where reliability, airflow stability, and standardized replacement compatibility with the 442CW family are required.