The RAPCO RA442CW-6-OH is an FAA-PMA approved overhauled dry air vacuum/pressure pump used in general aviation aircraft to supply vacuum power for gyro instruments such as attitude indicators and directional gyros.

It is a carbon-vane dry pump that operates without oil lubrication. Air is drawn through the system by rotating carbon vanes inside a precision-machined housing, generating stable vacuum or pressure depending on installation configuration.

The “-OH” designation indicates an overhauled exchange unit, rebuilt and tested to FAA standards (typically released with FAA Form 8130-3). It is commonly used as a direct replacement for Airborne and Aero Accessories 442CW-6 series pumps installed on Cessna, Piper, Beechcraft, and other GA aircraft equipped with engine-driven vacuum systems.

The pump includes design features such as an inspection port for vane wear monitoring and improved sealing to reduce contamination from engine oil, which is a common failure cause in vacuum systems.

As a life-limited component, it is periodically replaced based on operating hours and maintenance schedules.

Key features include:

RAPCO part number: RA442CW-6-OH
Overhauled FAA-PMA vacuum/pressure pump
Dry carbon-vane design (oil-free operation)
Engine-driven aircraft accessory pump
Replaces Airborne / Aero Accessories 442CW-6 series
Supplies vacuum for gyro instruments (AI, DG, TC systems)
Supplied as overhauled exchange unit (FAA 8130-3 release)
Inspection port for internal vane wear monitoring
Improved sealing against oil contamination
Compatible with common GA aircraft vacuum systems
Typical use in Cessna, Piper, Beechcraft installations
Designed for continuous-duty aircraft pneumatic operation