S-tec 55x Installation Manual -

Confirm you can manually overpower the servos with reasonable force.

Check that servos do not hit their internal stops before the flight controls hit their external stops. S-tec 55x Installation Manual

If you are looking for for an existing unit. Confirm you can manually overpower the servos with

Verify your specific aircraft tail number is on the Approved Model List (AML). S-tec 55x Installation Manual

The programmer/computer is designed for a standard 6.25-inch radio rack. Position within easy reach of the pilot.