During my condition inspection last year I noted some surface rust on the top cylinder of the WD-644. Not a lot of rust, but some. I found this because I am using PIP pins instead of the AN-525 screws to join the canopy frame with the roller mount. In trying to remove the PIP pins there was a fair amount of resistance due to the rust. The fix was easy, just some light buffing of the upper cylinder of the roller mount and a healthy application of low temp grease.
Still not 100% convinced I could get the canopy ejected using the PIP pins to release the forward canopy frame but I'm pretty sure I could not have done it with the resistance from that rust!
Still not 100% convinced I could get the canopy ejected using the PIP pins to release the forward canopy frame but I'm pretty sure I could not have done it with the resistance from that rust!