Could you give me a rough idea of how many parts are in a CFM engine today, and what's the mix between rotables, expendables, and consumables?

In terms of part numbers, there are more consumables than anything else. However, in terms of dollar amount, expendables take the lead. The most expensive parts on a jet engine are items like turbine blades, compressor blades, combustors, hot parts, and airfoils. Some turbine and compressor blades are repairable. The most expensive parts on an engine are the hot parts and airfoils, which could be either stator vanes or rotating blades.

It's just an approval process.

There are three kinds of PMA. When PMA first started, it started out as identicality. This was in the 70s and 80s. At the time, PMA companies used to steal drawings. Seriously; that's why PMA has a bad reputation. Steal drawings and go to the FAA, and they say, here's Boeing's drawing, here's Honeywell's drawing. Here's a drawing that is certified on that airplane, and I am making that drawing; that's identicality. Then the FAA wanted to control that. So they said, I have a process. If you bring me a drawing, that's fine, but you don't have to bring me a drawing. And here's the process to where you can do it.