I think it must have been in 1970, I was flying one CH-46 Sea Knight helicopter in a flight of two, as we headed back to MCAS New River in Jacksonville, NC, coming back from Florida. As we neared MCAS Myrtle Beach, SC, Air Traffic Control came up on our radios, and asked us to divert to search for surviors of a F-4 Phantom that had gone down about 100 miles off the coast. We replied, and said that we were low on fuel and would have to land first to tank up. While they were refueling our helicopers, we attended a briefing. Once it was over, we kicked the tires, lit the fires, and took off. When we got to the place where the F-4 went down, we searched the area for about an hour, but found nothing but the vertical stabalizer from the aircraft still floating in the swelling sea.
We went down just above the water, lowered the aft ramp, and while we hovered about a foot over it, our three man crew pulled it on board as far as they could. We couldn't raise the ramp fully, because the F-4's vertical stabalizer was too big to bring through the opening. We lifted back up to flying altitude, and were going to search some more, when we started smelling smoke in the cockpit. At first we thought the smoke must have been coming from the F-4's vertical stabalizer, until our crew chief screamed over the ICS...
"Sir, we're on fire...! We're on fire...! We're on fire...!"Yep, we were, and the smoke got thicker. We radioed our wingman, and told him what was going on, declared an emergancy, and dropped down to about 20 or 30 feet above the water, in case we had to put her down. At this low altitude, we could not pick up Myrtle Beach's TACAN, so our wingman, flying about 5,000 feet above us, radioed us directional corrections as we headed back to land. He did a damn good job, because when we hit land and jumped over the sand dunes, there was the runway straight in front of us.
As we did a roll-on landing, it was reassuring to see the ambulances, fire trucks, and things that looked like cherry pickers lined up on the side of the runway, which pulled out and followed us until we came to a stop.
The fire in the aft pylon was quickly extinguished. The helicopter didn't blow up, and we all survived.
What had happened was that our APU (That's the auxilliary power unit that started our two big turboshaft jet engines.) didn't shut off, and got very hot. When that happens, it is supposed to automatically shut down, but it didn't. That alone wouldn't have been a fatal problem, except for the fact that our aft transmission had an oil leak that ran directly down on the APU. Combustible fluid flowing over something very hot, and you get a fire.
It's not fun to catch on fire in a helicopter 100 miles out at sea, unless you make it home alive to tell your story.
It was in the back end of this wonderful aircraft, where the fire was.
p.s. MCAS is an abreviation for Marine Corps Air Station.
p.p.s. "TACAN" stands for "Tactical Air Navigation"
............................................................................................................................. Goodnight I'm going to bed, as soon as I make sure that we aren't on fire anymore.