There was a video on Liveleak recently (may have been from rotorheads thread) about a USMC Sea Knight or an S53 that showed the fire propogating on the inside of the ac as it lifted, due to a burst hydraulic line.
The Loadie suffered some flash burns but saved the civies from much worse.
May be just what you're looking for.
Here it is:
YouTube - CH-46 Sea Knight take-off fire