One of the projects we have underway right now is preparing a Cessna 402 to have its main wing spar inspected. This airplane is used for ministry in the northeastern US and Canada by Wings With the Word.
In March, a team of aviation students from LeTourneau University came out to pull the propellers and remove the engines from the airframe. Now our own guys are digging in a bit deeper pulling the landing gear, removing firewalls, and opening up the wing attach points.
The next phase is to have an outside contractor come in to perform the FAA mandated inspection to confirm airworthiness of the main spar. Should the spar be determined to be airworthy, we'll go ahead and install a "spar cap" as per an FAA Airworthiness
It's a rather complex, labor-intensive project.