The RAPCO RA1J10-1 is a pneumatic gyro air filter assembly used in aircraft vacuum systems to protect gyro instruments (attitude indicator, directional gyro, turn coordinator) from contamination such as dust, smoke, and particulates.

It is installed in the vacuum/pressure line between the pump and instruments, where it filters incoming airflow using a pleated 0.3-micron filter element. This helps maintain stable airflow and extends the service life of sensitive gyroscopic instruments.

The unit is a direct replacement for Airborne-style central filter assemblies and is commonly used in general aviation aircraft vacuum systems. It includes hose connections for integration into standard 3/8" pneumatic lines and is designed for periodic replacement as part of routine vacuum system maintenance.

Key features include:

RAPCO part number: RA1J10-1
Pneumatic gyro / vacuum system filter assembly
0.3-micron filtration element
Protects attitude indicator, DG, and gyro instruments
Inline installation in vacuum/pressure system
Dual 3/8" hose connections
Replacement interval typically ~500 flight hours / 1 year
Compatible with Airborne-style vacuum systems
Lightweight aircraft pneumatic component
Designed for general aviation vacuum instrument protection