We made it to the 1km before the trailhead in my stock Bronco. There were 4 vehicles made to that point. Someone cut down a tree on the road, and the ditch is too deep to continue. The massive washout at 1km is passable, but you need to drive carefully. Of course, don't care about your car's paint.
I was up there on a dirt bike and was able to make it to the 7km before I turned around at a good sized washout. The road is partially washed out around the 3km mark where a high clearance 4wd is likely needed. The trailhead is at about 4km, from 4 to 5km recent efforts have been made to clear the brushed in sections. Many brushed in sections past 5km
Road is steep but driveable with medium clearance 4x4 up to 590m elevation, where there is a massive cross ditch that is probably impassable without high clearance 4x4. Past that, the road would be OK for a kilometre or two, then becomes impassable.
[From Mark Daville] - The state of Folly Creek FSR, flagged off 1.5km before Airplane Creek FSR due to a deep drainage but there is a pond that 4x4 trucks could drive through (didn't want to attempt it in my CRV). Airplane Creek FSR, pretty much the same but the vertical ditches that was originally on the FSR do look like the got deeper than when we were there.