I used to fly 486 when it was privately owned. At one display we were scheduled to drop two skydivers. It turned out that the HCC12’s were the only Whirlwinds that didn’t have the general clearance for parachute dropping (what a surprise). We had to raise a mod with all the drawings just to fit the cabin door with the wire and pin to lock it open. With all the VIP kit, nice seats etc, it was very heavy and had no fuel jettison.