Not C130, but: I was assigned to the 19th MAS in 1969 as a LM on C124s (after 4 years on 130s).. on my first trip, I was told I needed to do a "wing tunnel inspection" (for you younger guys, the 124 was big enough there was a tunnel in each wing that provided access to 'stuff') .. anyway, we were a couple of hours out of Hickam (lots and lots of water).. I crawled out into the wing and was negotiating around the main tires (the walkway ended at the inboard tire, then there was a small piece between the tires, and then it continued out toward the tip).. anyway, I had one foot on the piece between the tires and one foot still on the inboard section (wrapped around the tire, of course) when the gear jumped. I set a record getting back to the cargo compartment! Turned out the C124 landing gear has UP-Neutral-Down positions. When it's in neutral, the pressure bleeds down and the gear rests on the uplocks. The ILM was watching me, and when I was hugging the tire, he told the CP to put the gear handle in the UP position, which caused the gear to "jump" up.. I didn't know that -- I thought the gear was going down and having been in the tunnel on the ground, I remembered the BIG hole that was there with the gear down!! The crew teased me about that for several days.. The C124 was an interesting airplane - I remember the gap between the nose loading doors in flight - normal, but disconcerting to a 130 LM!!