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.

This road is nasty. KM1 there is a steep cross ditch around a bend which could very well stop many vehicles. Followed by rough road base up to the infamous washout at KM3. I think this may be the worst washout I have come across yet. In order to get through easy enough I think it requires something with a solid front axle just because the 2 sides vary so much in height. Either that or some very skillful driving. After the washout the road base gets worse and it gets pretty grown in. Nice parking area at KM4 which could fit 4 cars easy. KM4-7 is impassible by vehicle. Many creek crossings and it is very grown in. I wouldn't bother bringing a bike if hiking was your mission.

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

I barely made it to the Baby Munday trailhead with a stock Jeep Rubicon, with the front sway bar disconnect engaged. Lockers weren't needed. Vehicles with less articulation and clearance likely won't be able to pass the washout. If you manage to reach the trailhead, it's possible to drive another kilometer or two without issue.

Update with picture

Drove to ~500m in a Subaru Crosstrek and there's a nice pullout. Leading up to that spot was a section of looser and steep rock, with one tricky spot at the top to navigate. When you're approaching that section from Foley FSR, the road surface significantly changes to 'rougher and steeper', and there aren't great spots for turning around before the pullout.

It added ~3.5km / ~475m eg to get to the Baby Munday trailhead.

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 Sara Leggat] - The airplane FSR is gnarly as anyone will tell you… I was able to drive about 3km up the road in my truck which left us 1km to walk to the trailhead (my truck has an extended cab, I was in 4 low basically the entire way) but i can’t say I’d drive that far again! There is one super steep dip/wash out probably 1km up the road where I will be stopping next time; I made it down the wash out without scraping my bumper but almost took it off when I was coming back up it. If you have a short wheel base, good clearance and good driving abilities you won’t have much issues making it 3km up the road… after that it looked pretty impassable unless you’re on an atv or something.

[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.