206B3 hydraulic failure

Bart wrote in message ...

The maintenance people went over the hydraulics system with a fine
tooth comb, and discovered/fixed an electrical fault that had caused
the problem. I never did get an explanation of why it felt like I
had hydraulics in one diagonal but not the other though, and wondered
if that was just the way it was supposed to feel at that airspeed
since Id never flown hydraulics-off that fast before.

BTW: The reason I didn't attempt to slow to 60kts during the failure
was because It only took a couple seconds for me to get the hydraulics
re-enabled and I didn't want to potentially aggravate the problem any
more by disrupting the collective.

Is it supposed to feel that way at that airspeed / power setting?

The reason you felt it in opposing quadrants like that is that the
cyclic portion of the hydraulic system has two servos. One boosts the
left fwd/right rear quadrants, the other boosts the right fwd/left
rear quadrants. When performing a maintenance test flight, you move
the cyclic back and forth diagonally to isolate each servo and check
their function. It sounds like you had a servo problem. Why popping
the circuit breaker helped the problem is a mystery. That CB supplies
power to the hydraulic system solenoid. The solenoid requires power
to turn the system OFF (for training and maintenance). It is designed
to be a fail safe system (system stays on if electrical power fails).
Pulling power to the hydraulic solenoid should have no effect unless
the switch was messing up.

Charlie W.

Bart wrote
I gotta say that the trigger assembly on the collective leaves a lot
to be desired. It seems like it'd be way too easy to accidentally
deploy the things by bumping that mammoth trigger.

Bart

You want want to look around at some operators like PHI. They had a
modifiction where they moved the collective-mounted float switch to
the cyclic with a guarded switch.
You might find this mod a little more confortable.
Greg

That sure would be a nicer place for it, but I think given the expense
of such a thing Im going to have to get used to it where it is.

Bart

Greg Johnsonq wrote:
Bart wrote

I gotta say that the trigger assembly on the collective leaves a lot
to be desired. It seems like it'd be way too easy to accidentally
deploy the things by bumping that mammoth trigger.

Bart


You want want to look around at some operators like PHI. They had a
modifiction where they moved the collective-mounted float switch to
the cyclic with a guarded switch.
You might find this mod a little more confortable.
Greg