RG and his Gaz.
I remember helping him fix it in the NT. The hydraulic system had a meltdown (literally). The Gaz has an airspace in the hydraulic tank which is a rubber bladder with a sponge inside. It is to give an expansion space within the tank while keeping it full. Helps when doing anything radical and not getting a gulp of air in the system.
The bladder had split and the oil had attacked the sponge which had fallen apart and gone through the hydraulic system and putting bits of sponge in all sorts of places it should not be.
A new tank pump assembly was fitted and the lines and servo's cleaned. After installing the new bits the engine wouldn't start.
Having some experience with the Artouste 3B the Astazou couldn't be that much different. Found that the oil pressure switch which controls the torch ignitors was stuck. Being miles from anywhere I opened the fancy looking Turbomeca switch to find a couple of 50 cent American "Microswitch" components inside. A little bit of lubrication and "Voila" as they say.
Went for fly with RG and he let me fly it as a bit of a return favour. Subsequently still probably still hold the speed record for a helicopter beat up at VRD. ~ 160 knots?
RG realised after a while that I flew helicopters as well as fixed them.
The Gaz was nice. As you unload the fenestron with speed you can put more power into the main rotor. Felt like a big 300 and much smoother than a 350. As you would expect I suppose.