G44 wrote:Hiller not a backcountry machine? My dad flew Hiller's all over Alaska in the 60's, they hauled extra gas with them at times in cans on the baskets that were mounted to the skids. I have a soft spot for Hiller's, looking forward to your thread on them.
Kurt
Ok Kurt, this one is for you...after this it's time to get back on the Citabria so I don't lose my audience!!
I got trained by Eddie Johnson of Johnson Helicopter Services out of Porterville, CA on maintaining my friends Hiller UH-12B helicopter.
It was really fun and Eddie is a super nice guy and knows everything about these helicopters...inside and out.
He worked at the Hiller factory for more than a decade before he started his own business and repair station, and he actually completely rebuilt this particular helicopter less than 40 flight hours ago.
I can't bore everyone with the details of each and every step of the inspection, so I'll just post some pictures to share the highlights of the process.

Remove the paddles and using dye penetrant, check for cracks.


Then primer the steel paddles and insert them into the aluminum cuffs while they're still wet.


Also have to check some holes for cracks inside rotor system using the dye.




Drain the oil

Next is the screens



Remove the seats and access panels

Remove the air filter

Remove rear spark plugs

Clean the fan and inspect for cracks. If it gets too dirty, it can get out of balance and that can cause cracking.


Remove the cover from the electrical bits and inspect everything for loose connections, chafing, damaged wiring, etc...

And the fuel system fittings/valves

This generator is the hardest thing to R&R on the helicopter.

Some chafing here

So we loosened the fitting and moved the hose

Check the APU solenoid and associated wiring

Serviced the water in the battery

Inspect the magneto points

Driveshaft universal joints which are automotive origin

So many fittings to grease. It was A LOT!

Filled the cuffs with oil.

Inspect the rotor blades

Drain, flush, and fill the tail rotor gear box.


Inspect the tail rotor

Tail rotor cables

Check mixture, carb heat, and throttle controls


Check everything on the instrument panel

Check compression

That's about all the pics I have. Just put everything back together then we test ran it outside.



Here's a good pic of Eddie. Nicest guy you'll ever meet.
