Today's Message Index:
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1. 05:06 AM - Re: Fw: About pusating pressure indication(500 S) (alh1@juno.com)
2. 10:00 PM - Re: Hydraulic Accumulator (Bill Hamilton)
3. 10:42 PM - Re: Hydraulic Accumulator (Bill Hamilton)
4. 11:12 PM - Re: Hydraulic Accumulator (CloudCraft@aol.com)
Message 1
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| Subject: | Re: Fw: About pusating pressure indication(500 S) |
--> Commander-List message posted by: alh1@juno.com
if your hydraulic accumulator needs service, it is normal. al hoffman
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Message 2
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| Subject: | Re: Hydraulic Accumulator |
--> Commander-List message posted by: Bill Hamilton <fighterf@ozemail.com.au>
Lowell,
I am certain somebody will come up with the derails, but find a more modern
and much cheaper accumulator, and fit it under a field approval.
Cheers,
Bill Hamilton.
At 03:03 PM 17/07/03 -0700, you wrote:
>--> Commander-List message posted by: "Lowell Girod" <dongirod@earthlink.net>
>
>Bilbo;
> My 560E has a hydraulic accumulator diaphragm leak, it doesn't hold
> pressure. Also this makes, so I am told by my mechanic, the hyd. gage
> fluctuate between 1000 - 1200 psi.. and this he says is bad for the pumps
> and the lines and seals. I tend to agree on a 3000 PSI hyd. system, but
> not sure about on our Commanders. Believe you has some problems with
> yours awhile back, so would like your opinion, cost to fix it is between
> $ 500 and a thousand, so I am told.
>Thanks, Don
>
>Lowell Girod
>dongirod@earthlink.net
>
>
Message 3
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| Subject: | Hydraulic Accumulator |
--> Commander-List message posted by: Bill Hamilton <fighterf@ozemail.com.au>
Folks,
There is a system accumulator, and the emergency gear extension nitrogen
cylinder,
my previous remarks were directed to the system accumulator in the baggage
area, on the bulkhead.
Regards,
Bill Hamilton.
At 03:14 PM 18/07/03 -0500, you wrote:
>--> Commander-List message posted by: "Jim Addington"
><jtaddington@charter.net>
>
>I looked in the book to make sure, it should be charged to 600 psi of dry
>air or nitrogen. There is not a gage you can check which I don't understand
>why not, so to get a true reading is hard. The turbine commanders had one
>and I am looking it to putting in my plane. This is an important item
>because it is the damper for the system and it taxies badly when the
>pressure is down. I bought a nitrogen regulator and put it in the plane
>because I have needed to service it when they had the bottle but no
>regulator that would fit my fittings. I did not talk about it when we talked
>with Al but you should get a copy of the service manual and the parts manual
>and put in the plane so if something happened at a place where no one is
>familiar with Commanders they have something to go by. It has saved me some
>headaches even on my own field when the regular person I use was not here.
>
>Jim
>
>
>-----Original Message-----
>From: owner-commander-list-server@matronics.com
>[mailto:owner-commander-list-server@matronics.com]On Behalf Of Bill Bow
>To: commander-list@matronics.com
>Subject: Re: Commander-List: Hydraulic Accumulator
>
>
>--> Commander-List message posted by: "Bill Bow" <bowing74@earthlink.net>
>
>I've seen it. What is supposed to be the charge of that one?
>
>bilbo
>
>----- Original Message -----
>From: "Jim Addington" <jtaddington@charter.net>
>To: <commander-list@matronics.com>
>Subject: RE: Commander-List: Hydraulic Accumulator
>
>
> > --> Commander-List message posted by: "Jim Addington"
><jtaddington@charter.net>
> >
> > The one I had to replace was the one in the left wheelwell.
> >
> > Jim
> > N444BD
> >
> > -----Original Message-----
> > From: owner-commander-list-server@matronics.com
> > [mailto:owner-commander-list-server@matronics.com]On Behalf Of Bill Bow
> > To: commander-list@matronics.com
> > Subject: Re: Commander-List: Hydraulic Accumulator
> >
> >
> > --> Commander-List message posted by: "Bill Bow" <bowing74@earthlink.net>
> >
> > Are we talking about the accumulator on the back wall of the baggage
> > compartment that is about the size of a 20 oz. Pepsi bottle?
> >
> > bilbo
> > ----- Original Message -----
> > From: "Jim Addington" <jtaddington@charter.net>
> > To: <commander-list@matronics.com>
> > Subject: RE: Commander-List: Hydraulic Accumulator
> >
> >
> > > --> Commander-List message posted by: "Jim Addington"
> > <jtaddington@charter.net>
> > >
> > > I don't know if the system is the same but I lost all hydraulic fluid
>four
> > > times before we finally discovered what it was. that is not on the
> > approved
> > > list of fun things to do. We thought it was a line the first time, then
>we
> > > thought we had overheated the pumps and had them resealed, then we
> > replaced
> > > all the lines in and out of the pumps, then finally settled on the
> > > accumulator and that stoped the fluid loss. I think there is a different
> > > system that will replace the old style but we had already replaced mine
> > with
> > > the old type.
> > >
> > > Jim Addington (500A)
> > > N444BD
> > >
> > >
> > > -----Original Message-----
> > > From: owner-commander-list-server@matronics.com
> > > [mailto:owner-commander-list-server@matronics.com]On Behalf Of
> > > YOURTCFG@aol.com
> > > To: commander-list@matronics.com
> > > Subject: Re: Commander-List: Hydraulic Accumulator
> > >
> > >
> > > --> Commander-List message posted by: YOURTCFG@aol.com
> > >
> > > In a message dated 7/17/2003 12:06:35 PM Pacific Standard Time,
> > > dongirod@earthlink.net writes:
> > >
> > > > My 560E has a hydraulic accumulator diaphragm leak
> > >
> > > HI DON.
> > >
> > > I would recommend fixing the diaphragm (assuming you can
> > > find
> > > one) It will cause the unloading valve to do the work of the accumulator
> > and
> > > it will be the next to go. I have flow Commanders with blow
>accumulators
> > > for
> > > extended time, not knowing any better. The airplane eventually broke a
> > hard
> > > line in the belly of the airplane that I attributed to the constant
>"bang"
> > > of
> > > the unloading valve. It caused the brake system to fail, and I ran of
>the
> > > end
> > > of the runway (no damage) "You can pay me now, or pay me latter" jb
> > >
> > >
> >
> >
>
>
Message 4
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| Subject: | Re: Hydraulic Accumulator |
--> Commander-List message posted by: CloudCraft@aol.com
In a message dated 07/20/03 22:42:57 Pacific Daylight Time,
fighterf@ozemail.com.au writes:
> Folks,
> There is a system accumulator, and the emergency gear extension nitrogen
> cylinder,
> my previous remarks were directed to the system accumulator in the baggage
> area, on the bulkhead.
> Regards,
> Bill Hamilton.
>
Let's clarify the clarification.
The accumulator -- also serving as the loading / unloading valve -- is in the
left hand wheel well, upper, forward and has a Schraeder (sp?) valve on it to
bring the nitrogen pressure up to 600 psi.
There is no gauge on this; pressure is checked when a nitrogen tank is hooked
up and the regulator on the filler tank is set at 600 psi by the mechanic.
Low pressure in this canister (as little as 50 psi off) or over-all
deterioration of this component causes the hydraulic slam during taxi and/or allows
a
fluctuating system pressure when no demand is present.
On the FLAT NACELLE models, there is a metal "bottle" on the aft baggage
bulkhead . This is the nitrogen container for the pneumatic side of the outboard
main landing gear actuators. (Outboard main landing gear actuators are
hydraulic up, pneumatic down.)
This pressure is read on the small pressure gauge in the left wheel well,
inboard side, above the inboard gear door. This pressure should be in the 325
psi range.
The nitrogen bottle for emergency landing gear extension has nothing to do
with a fluctuating system hydraulic pressure.
Just a note here for those new to the Commander, or those shopping. The 325
psi for emergency landing gear extension is not a value where "more is
better." Over-pressure in the pneumatic actuators will slow gear retraction as
the
1000 psi hydraulic pressure system has to overcome the nitrogen pressure on the
gear's up swing.
Also understand that this so-called "emergency" nitrogen system is working
with every landing gear extension. The 1000 psi hydraulic pressure on the
inboard actuators happens to eclipse the 325 psi nitrogen pressure of the pneumatic
actuators ... but it's there all the time if ever needed, should the
hydraulic system pressure fail.
Wing Commander Gordon
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