Mooney M20C Questions

On 18 Apr 2007 08:10:13 -0700, Greg Esres wrote:

On the hydraulic flaps, does the position of the silver pump handle
have any bearing on whether or not the hydraulic pressure leaks out of
the flap, once they are extended? (The POH doesn't say that it does.)


Yes. That's how you retract the flaps.

There is some mechanism underneath the instrument panel that has some
adjustment for the Positive Control. What does it do, exactly?

I don't recall anything at all like that in either the '68C or the '65E
models with which I have experience.
--ron

Yes. That's how you retract the flaps.

No, the retraction mechanism is a little flap-like lever *above* the
silver handle. Lifting it up releases the hydraulic pressure. When
it's down, the pressure should remain.

The silver handle I'm talking about is the pumping handle.

The flaps are coming up some times when I'm not looking and I haven't
established a pattern yet. ;-)



On Apr 18, 7:47 pm, Ron Rosenfeld wrote:
On 18 Apr 2007 08:10:13 -0700, Greg Esres wrote:

On the hydraulic flaps, does the position of the silver pump handle
have any bearing on whether or not the hydraulic pressure leaks out of
the flap, once they are extended? (The POH doesn't say that it does.)

Yes. That's how you retract the flaps.

There is some mechanism underneath the instrument panel that has some
adjustment for the Positive Control. What does it do, exactly?

I don't recall anything at all like that in either the '68C or the '65E
models with which I have experience.
--ron

On 18 Apr 2007 19:16:58 -0700, Greg Esres wrote:

Yes. That's how you retract the flaps.

No, the retraction mechanism is a little flap-like lever *above* the
silver handle. Lifting it up releases the hydraulic pressure. When
it's down, the pressure should remain.

The silver handle I'm talking about is the pumping handle.

Oh, I misread. It shouldn't make any difference, but I've always left it
fully down (out of the way). On occasion, during pre-flight, it might be in
an intermediate position, though. I'd suspect a leak in the hydraulic
system.


The flaps are coming up some times when I'm not looking and I haven't
established a pattern yet. ;-)



On Apr 18, 7:47 pm, Ron Rosenfeld wrote:
On 18 Apr 2007 08:10:13 -0700, Greg Esres wrote:

On the hydraulic flaps, does the position of the silver pump handle
have any bearing on whether or not the hydraulic pressure leaks out of
the flap, once they are extended? (The POH doesn't say that it does.)

Yes. That's how you retract the flaps.

There is some mechanism underneath the instrument panel that has some
adjustment for the Positive Control. What does it do, exactly?

I don't recall anything at all like that in either the '68C or the '65E
models with which I have experience.
--ron


--ron

Ron Rosenfield wrote:

I'd suspect a leak in the hydraulic system.

That's kinda what I was thinking. Thank you.

If you're not having to add fluid, and you're probably not then the issue is the flap valve leaking through and relieving the pressure that keeps the flaps extended. We had that problem one year and a quick rebuild of the valve during the annual fixed the issue.

--
Jim Carter
Rogers, Arkansas
"Ron Rosenfeld" wrote in message ...
On 18 Apr 2007 19:16:58 -0700, Greg Esres wrote:

Yes. That's how you retract the flaps.

No, the retraction mechanism is a little flap-like lever *above* the
silver handle. Lifting it up releases the hydraulic pressure. When
it's down, the pressure should remain.

The silver handle I'm talking about is the pumping handle.

Oh, I misread. It shouldn't make any difference, but I've always left it
fully down (out of the way). On occasion, during pre-flight, it might be in
an intermediate position, though. I'd suspect a leak in the hydraulic
system.


The flaps are coming up some times when I'm not looking and I haven't
established a pattern yet. ;-)



On Apr 18, 7:47 pm, Ron Rosenfeld wrote:
On 18 Apr 2007 08:10:13 -0700, Greg Esres wrote:

On the hydraulic flaps, does the position of the silver pump handle
have any bearing on whether or not the hydraulic pressure leaks out of
the flap, once they are extended? (The POH doesn't say that it does.)

Yes. That's how you retract the flaps.

There is some mechanism underneath the instrument panel that has some
adjustment for the Positive Control. What does it do, exactly?

I don't recall anything at all like that in either the '68C or the '65E
models with which I have experience.
--ron


--ron