The vertical card compass is very sensitive to stray magnetic fields within the aircraft. If the compensators of the compass will not bring the compass
within tolerances, it will be necessary to install the PBB475 compensator ("balanced balls"). These balls contain magnets which permit the compass to be properly compensated.
Note: These compass compensators are made specifically for the Precision aviation compasses. The mounting holes may not match other compasses.
They work very well help to avoid the deviation of the vertical commas affected for the AC fan motor
BALANCING BALL SET #PBB-475
good quality did not fix the problem
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
Per the manufacturer, this should work as long as the magnetic variation is not greater than 20 degrees. It is also recommended to use magnetic shielding with the compass compensator.
The compass compensator comes with directions for mounting this behind the compass.
This will not connect to the Airpath Compass as the Airpath compass is a different design.