Today's Message Index:
----------------------
1. 08:08 AM - Re: Nose actuator pressure (st.ellison@comcast.net)
2. 08:44 AM - Re: Nose actuator pressure (Walter Lannon)
3. 08:58 AM - Re: Nose actuator pressure (Doug Sapp)
4. 09:03 AM - Fw: 4 July (AEROSTAR)
5. 04:20 PM - Re: Nose actuator pressure (A. Dennis Savarese)
6. 05:09 PM - [luscombe-silvaire] Fw: Complaint (Jim Ivey)
7. 07:13 PM - Yak and CJs (Gilles St-Pierre)
Message 1
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| Subject: | Re: Nose actuator pressure |
--> Yak-List message posted by: st.ellison@comcast.net
Pappy:
Thanks for the comments on the actuator operating pressure. I think you are correct
in that both the Yak and CJ use nearly the same setup on the nose gear actuator.
Here is my concern, I just got the acutator back from having a leaking
o-ring changed and when I apply air to the cylinder it takes only about 40-50
psi (maybe less) to extend the pushrod to the fully extended position but even
with the pressure going up to 240 psi the balls do not lock the unit into that
extended position. I am pretty new to this but from what I recall on another
cylinder the balls would "lock in" with very little pressure as long as the
actuator was fully extended. I'm just having trouble (in good concience where
my insurance company is concerned) putting this unit back in when something just
doesn't "feel" right. Do you think it is normal to take such a large pressure
differential between extension of the actuator and locking the balls in place?
Thanks for your comments.
Steve
-------------- Original message --------------
> --> Yak-List message posted by: cjpilot710@aol.com
>
> In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
> st.ellison@comcast.net writes:
>
> --> Yak-List message posted by: st.ellison@comcast.net
>
> You you guys give me a specific range on the minumum air pressure that
> should be required to extend and lock a nose gear actuator from a Yak-52 on the
> bench?
>
> Steve
>
> You you guys give me a specific range on the minumum air pressure that
> should be required to extend and lock a nose gear actuator from a Yak-52 on the
> bench?
>
> Steve
>
>
> Steve,
> I know on the CJ-6 which has fairly close to the same system setup it's a
> "minimum" of 25 atmospheres for gear retraction. That's 25 x 14.5 = 362.5
> lbs/sq. in. Now that is with gear weight attached. The actuator will move
> with less than that with no load.
>
> Correct me someone if I'm wrong.
>
> Jim "Pappy" Goolsby
>
>
>
>
>
>
>
Pappy:
Thanks for the comments on the actuator operating pressure. I think you are correct
in that both the Yak and CJ use nearly the same setup on the nose gear actuator.
Here is my concern, I just got the acutator back from having a leaking
o-ring changed and when I apply air to the cylinder it takes only about 40-50
psi (maybe less) to extend the pushrod to the fully extended position but even
with the pressure going up to 240 psi the balls do not lock the unit into that
extended position. I am pretty new to this but from what I recall on another
cylinder the balls would "lock in" with very little pressure as long as the
actuator was fully extended. I'm just having trouble (in good concience where
my insurance company is concerned) putting this unit back in when something just
doesn't "feel" right. Do you think it is normal to take such a large pressure
differential between extension of the actuator and locking the balls in place?
Thanks for your comments.
Steve
-------------- Original message --------------
-- Yak-List message posted by: cjpilot710@aol.com
In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
st.ellison@comcast.net writes:
-- Yak-List message posted by: st.ellison@comcast.net
You you guys give me a specific range on the minumum air pressure that
should be required to extend and lock a nose gear actuator from a Yak-52 on the
bench?
Steve
You you guys give me a specific range on the minumum air pressure that
should be required to extend and lock a nose gear actuator from a Yak-52 on the
bench?
Steve
Steve,
I know on the CJ-6 which has fairly close to the same system setup it's a
"minimum" of 25 atmospheres
for gear retraction. That's 25 x 14.5 = 362.5
lbs/sq. in. Now that is with gear weight attached. The actuator will move
with less than that with no load.
Correct me someone if I'm wrong.
Jim "Pappy" Goolsby
Message 2
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| Subject: | Re: Nose actuator pressure |
--> Yak-List message posted by: "Walter Lannon" <wlannon@cablerocket.com>
Steve;
You do have a problem. The ball lock should engage and disengage reliably
with shop air pressure (100 psi or less).
I would absolutely expect it to do this at 50 psi or less.
The ball lock may be incorrectly assembled.
Walt
----- Original Message -----
From: <st.ellison@comcast.net>
Subject: Re: Yak-List: Nose actuator pressure
> --> Yak-List message posted by: st.ellison@comcast.net
>
> Pappy:
>
> Thanks for the comments on the actuator operating pressure. I think you
> are correct in that both the Yak and CJ use nearly the same setup on the
> nose gear actuator. Here is my concern, I just got the acutator back from
> having a leaking o-ring changed and when I apply air to the cylinder it
> takes only about 40-50 psi (maybe less) to extend the pushrod to the fully
> extended position but even with the pressure going up to 240 psi the balls
> do not lock the unit into that extended position. I am pretty new to this
> but from what I recall on another cylinder the balls would "lock in" with
> very little pressure as long as the actuator was fully extended. I'm just
> having trouble (in good concience where my insurance company is concerned)
> putting this unit back in when something just doesn't "feel" right. Do you
> think it is normal to take such a large pressure differential between
> extension of the actuator and locking the balls in place?
>
> Thanks for your comments.
>
> Steve
>
> -------------- Original message --------------
>
>> --> Yak-List message posted by: cjpilot710@aol.com
>>
>> In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
>> st.ellison@comcast.net writes:
>>
>> --> Yak-List message posted by: st.ellison@comcast.net
>>
>> You you guys give me a specific range on the minumum air pressure that
>> should be required to extend and lock a nose gear actuator from a Yak-52
>> on the
>> bench?
>>
>> Steve
>>
>> You you guys give me a specific range on the minumum air pressure that
>> should be required to extend and lock a nose gear actuator from a Yak-52
>> on the
>> bench?
>>
>> Steve
>>
>>
>> Steve,
>> I know on the CJ-6 which has fairly close to the same system setup it's a
>> "minimum" of 25 atmospheres for gear retraction. That's 25 x 14.5 = 362.5
>> lbs/sq. in. Now that is with gear weight attached. The actuator will move
>> with less than that with no load.
>>
>> Correct me someone if I'm wrong.
>>
>> Jim "Pappy" Goolsby
>>
>>
>>
>>
>>
>>
>>
>
> Pappy:
>
> Thanks for the comments on the actuator operating pressure. I think you
> are correct in that both the Yak and CJ use nearly the same setup on the
> nose gear actuator. Here is my concern, I just got the acutator back from
> having a leaking o-ring changed and when I apply air to the cylinder it
> takes only about 40-50 psi (maybe less) to extend the pushrod to the fully
> extended position but even with the pressure going up to 240 psi the balls
> do not lock the unit into that extended position. I am pretty new to this
> but from what I recall on another cylinder the balls would "lock in" with
> very little pressure as long as the actuator was fully extended. I'm just
> having trouble (in good concience where my insurance company is concerned)
> putting this unit back in when something just doesn't "feel" right. Do you
> think it is normal to take such a large pressure differential between
> extension of the actuator and locking the balls in place?
>
> Thanks for your comments.
>
> Steve
>
> -------------- Original message --------------
>
> -- Yak-List message posted by: cjpilot710@aol.com
>
> In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
> st.ellison@comcast.net writes:
>
> -- Yak-List message posted by: st.ellison@comcast.net
>
> You you guys give me a specific range on the minumum air pressure that
> should be required to extend and lock a nose gear actuator from a Yak-52
> on the
> bench?
>
> Steve
>
> You you guys give me a specific range on the minumum air pressure that
> should be required to extend and lock a nose gear actuator from a Yak-52
> on the
> bench?
>
> Steve
>
>
> Steve,
> I know on the CJ-6 which has fairly close to the same system setup it's a
> "minimum" of 25 atmospheres
> for gear retraction. That's 25 x 14.5 = 362.5
> lbs/sq. in. Now that is with gear weight attached. The actuator will move
> with less than that with no load.
>
> Correct me someone if I'm wrong.
>
> Jim "Pappy" Goolsby
>
>
>
Message 3
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| Subject: | Nose actuator pressure |
--> Yak-List message posted by: "Doug Sapp" <rvfltd@televar.com>
Steve,
If the actuator does not lock properly check out the overhaul spec in your
PT Trainer Aircraft Overhaul Manual for Airframe Accessories, see pages 5-1
thru 5-7 for the disassembly, overhaul, adjustment and reassembly. Also, in
the Chujiao-6 Airplane Tech Spec For Service and Maint. manual on pages
67,68,69 here is a detailed description of how the ball lock functions.
One caution: Many guys want to paint the actuators before reinstalling them
in the aircraft, this is a great idea to prevent rust and corrosion, but DO
NOT get paint on the shaft, tape off 100% 0f its travel length. Of the last
6 actuators that I disassembled for overhaul(yes we have all the parts in
stock)I found that the main reason for the failure was that paint had packed
up in the first set of 0 rings causing them to become slightly displaced,
when the actuator was next used the 0 rings were cut or dislodged
completely. Also, as previously posted, we have been finding actuators that
have been adjusted improperly (internally), causing cracks in the shaft and
end cap stops to be nearly beaten flat. There is tremendous strain on the
actuators, if they are bottoming out internally it is a potential problem,
something has to give.
Best from here.
Always Yakin,
Doug Sapp
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com]On Behalf Of
st.ellison@comcast.net
Subject: Re: Yak-List: Nose actuator pressure
--> Yak-List message posted by: st.ellison@comcast.net
Pappy:
Thanks for the comments on the actuator operating pressure. I think you are
correct in that both the Yak and CJ use nearly the same setup on the nose
gear actuator. Here is my concern, I just got the acutator back from having
a leaking o-ring changed and when I apply air to the cylinder it takes only
about 40-50 psi (maybe less) to extend the pushrod to the fully extended
position but even with the pressure going up to 240 psi the balls do not
lock the unit into that extended position. I am pretty new to this but from
what I recall on another cylinder the balls would "lock in" with very little
pressure as long as the actuator was fully extended. I'm just having trouble
(in good concience where my insurance company is concerned) putting this
unit back in when something just doesn't "feel" right. Do you think it is
normal to take such a large pressure differential between extension of the
actuator and locking the balls in place?
Thanks for your comments.
Steve
-------------- Original message --------------
> --> Yak-List message posted by: cjpilot710@aol.com
>
> In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
> st.ellison@comcast.net writes:
>
> --> Yak-List message posted by: st.ellison@comcast.net
>
> You you guys give me a specific range on the minumum air pressure that
> should be required to extend and lock a nose gear actuator from a Yak-52
on the
> bench?
>
> Steve
>
> You you guys give me a specific range on the minumum air pressure that
> should be required to extend and lock a nose gear actuator from a Yak-52
on the
> bench?
>
> Steve
>
>
> Steve,
> I know on the CJ-6 which has fairly close to the same system setup it's a
> "minimum" of 25 atmospheres for gear retraction. That's 25 x 14.5 = 362.5
> lbs/sq. in. Now that is with gear weight attached. The actuator will move
> with less than that with no load.
>
> Correct me someone if I'm wrong.
>
> Jim "Pappy" Goolsby
>
>
Pappy:
Thanks for the comments on the actuator operating pressure. I think you are
correct in that both the Yak and CJ use nearly the same setup on the nose
gear actuator. Here is my concern, I just got the acutator back from having
a leaking o-ring changed and when I apply air to the cylinder it takes only
about 40-50 psi (maybe less) to extend the pushrod to the fully extended
position but even with the pressure going up to 240 psi the balls do not
lock the unit into that extended position. I am pretty new to this but from
what I recall on another cylinder the balls would "lock in" with very little
pressure as long as the actuator was fully extended. I'm just having trouble
(in good concience where my insurance company is concerned) putting this
unit back in when something just doesn't "feel" right. Do you think it is
normal to take such a large pressure differential between extension of the
actuator and locking the balls in place?
Thanks for your comments.
Steve
-------------- Original message --------------
-- Yak-List message posted by: cjpilot710@aol.com
In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
st.ellison@comcast.net writes:
-- Yak-List message posted by: st.ellison@comcast.net
You you guys give me a specific range on the minumum air pressure that
should be required to extend and lock a nose gear actuator from a Yak-52 on
the
bench?
Steve
You you guys give me a specific range on the minumum air pressure that
should be required to extend and lock a nose gear actuator from a Yak-52 on
the
bench?
Steve
Steve,
I know on the CJ-6 which has fairly close to the same system setup it's a
"minimum" of 25 atmospheres
for gear retraction. That's 25 x 14.5 = 362.5
lbs/sq. in. Now that is with gear weight attached. The actuator will move
with less than that with no load.
Correct me someone if I'm wrong.
Jim "Pappy" Goolsby
Message 4
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--> Yak-List message posted by: "AEROSTAR" <aerostar@aerostar.ro>
----- Original Message -----
From: "MARKETING" <marketing@aerostar.ro>
Subject: 4 July
> Dear Gentlemen ,
>
> Best wishes from Aerostar - Romania to all our American friends , all
the
> best and a happy " 4 July " celebration Holliday .
> Sincerely ,
>
> Cristian Dragoi
>
>
Message 5
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| Subject: | Re: Nose actuator pressure |
--> Yak-List message posted by: "A. Dennis Savarese" <dsavarese@elmore.rr.com>
I concur 100% with Walt's assessment. An overhauled/new Yak 52 actuator
will fully engage (lock into position) and disengage with less than 100 psi.
Dennis
----- Original Message -----
From: "Walter Lannon" <wlannon@cablerocket.com>
Subject: Re: Yak-List: Nose actuator pressure
> --> Yak-List message posted by: "Walter Lannon" <wlannon@cablerocket.com>
>
> Steve;
>
> You do have a problem. The ball lock should engage and disengage reliably
> with shop air pressure (100 psi or less).
> I would absolutely expect it to do this at 50 psi or less.
> The ball lock may be incorrectly assembled.
>
> Walt
> ----- Original Message -----
> From: <st.ellison@comcast.net>
> To: <yak-list@matronics.com>
> Subject: Re: Yak-List: Nose actuator pressure
>
>
>> --> Yak-List message posted by: st.ellison@comcast.net
>>
>> Pappy:
>>
>> Thanks for the comments on the actuator operating pressure. I think you
>> are correct in that both the Yak and CJ use nearly the same setup on the
>> nose gear actuator. Here is my concern, I just got the acutator back from
>> having a leaking o-ring changed and when I apply air to the cylinder it
>> takes only about 40-50 psi (maybe less) to extend the pushrod to the
>> fully
>> extended position but even with the pressure going up to 240 psi the
>> balls
>> do not lock the unit into that extended position. I am pretty new to this
>> but from what I recall on another cylinder the balls would "lock in" with
>> very little pressure as long as the actuator was fully extended. I'm just
>> having trouble (in good concience where my insurance company is
>> concerned)
>> putting this unit back in when something just doesn't "feel" right. Do
>> you
>> think it is normal to take such a large pressure differential between
>> extension of the actuator and locking the balls in place?
>>
>> Thanks for your comments.
>>
>> Steve
>>
>> -------------- Original message --------------
>>
>>> --> Yak-List message posted by: cjpilot710@aol.com
>>>
>>> In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
>>> st.ellison@comcast.net writes:
>>>
>>> --> Yak-List message posted by: st.ellison@comcast.net
>>>
>>> You you guys give me a specific range on the minumum air pressure that
>>> should be required to extend and lock a nose gear actuator from a Yak-52
>>> on the
>>> bench?
>>>
>>> Steve
>>>
>>> You you guys give me a specific range on the minumum air pressure that
>>> should be required to extend and lock a nose gear actuator from a Yak-52
>>> on the
>>> bench?
>>>
>>> Steve
>>>
>>>
>>> Steve,
>>> I know on the CJ-6 which has fairly close to the same system setup it's
>>> a
>>> "minimum" of 25 atmospheres for gear retraction. That's 25 x 14.5 =
>>> 362.5
>>> lbs/sq. in. Now that is with gear weight attached. The actuator will
>>> move
>>> with less than that with no load.
>>>
>>> Correct me someone if I'm wrong.
>>>
>>> Jim "Pappy" Goolsby
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>> Pappy:
>>
>> Thanks for the comments on the actuator operating pressure. I think you
>> are correct in that both the Yak and CJ use nearly the same setup on the
>> nose gear actuator. Here is my concern, I just got the acutator back from
>> having a leaking o-ring changed and when I apply air to the cylinder it
>> takes only about 40-50 psi (maybe less) to extend the pushrod to the
>> fully
>> extended position but even with the pressure going up to 240 psi the
>> balls
>> do not lock the unit into that extended position. I am pretty new to this
>> but from what I recall on another cylinder the balls would "lock in" with
>> very little pressure as long as the actuator was fully extended. I'm just
>> having trouble (in good concience where my insurance company is
>> concerned)
>> putting this unit back in when something just doesn't "feel" right. Do
>> you
>> think it is normal to take such a large pressure differential between
>> extension of the actuator and locking the balls in place?
>>
>> Thanks for your comments.
>>
>> Steve
>>
>> -------------- Original message --------------
>>
>> -- Yak-List message posted by: cjpilot710@aol.com
>>
>> In a message dated 7/3/2005 1:52:09 P.M. Eastern Daylight Time,
>> st.ellison@comcast.net writes:
>>
>> -- Yak-List message posted by: st.ellison@comcast.net
>>
>> You you guys give me a specific range on the minumum air pressure that
>> should be required to extend and lock a nose gear actuator from a Yak-52
>> on the
>> bench?
>>
>> Steve
>>
>> You you guys give me a specific range on the minumum air pressure that
>> should be required to extend and lock a nose gear actuator from a Yak-52
>> on the
>> bench?
>>
>> Steve
>>
>>
>> Steve,
>> I know on the CJ-6 which has fairly close to the same system setup it's a
>> "minimum" of 25 atmospheres
>> for gear retraction. That's 25 x 14.5 = 362.5
>> lbs/sq. in. Now that is with gear weight attached. The actuator will move
>> with less than that with no load.
>>
>> Correct me someone if I'm wrong.
>>
>> Jim "Pappy" Goolsby
>>
>>
>>
>
>
>
Message 6
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| Subject: | [luscombe-silvaire] Fw: Complaint |
--> Yak-List message posted by: Jim Ivey <jim@jimivey.com>
----- Forwarded message from 2dale@dakotacom.net -----
Date: Mon, 4 Jul 2005 14:47:02 -0700
From: Dale Adams <2dale@dakotacom.net>
Subject: [luscombe-silvaire] Fw: Complaint
To: Luscombe Yahoo <luscombe-silvaire@yahoogroups.com>
A complaint post from a moron, and the reply:
Complaint:
Quote:
A wake-up call from Luke's jets
Jun. 23, 2005 12:00 AM
"Question of the day for Luke Air Force Base: Whom do we thank for the
morning air show?
Last Wednesday, at precisely 9:11 a.m., a tight formation of four F-16
jets made a low pass over Arrowhead Mall, continuing west over Bell Road
at approximately 500 feet. Imagine our good fortune!
Do the Tom Cruise-wannabes feel we need this wake-up call, or were they
trying to impress the cashiers at Mervyns' early-bird special?
Any response would be appreciated."
The reply is classic, and a testament to the professionalism and heroism
of the folks in the armed services. The response:
Quote:
Regarding "A wake-up call from Luke's jets" (Letters, Thursday):
On June 15, at precisely 9:12 a.m., a perfectly timed four-ship of F-16s
from the 63rd Fighter Squadron at Luke Air Force Base flew over the
grave of Capt Jeremy Fresques.
Capt. Fresques was an Air Force officer who was previously stationed at
Luke Air Force Base and was killed in Iraq on May 30, Memorial Day.
At 9 a.m. on June 15, his family and friends gathered at Sunland
Memorial Park in Sun City to mourn the loss of a husband, son and friend.
Based on the letter writer's recount of the flyby, and because of the
jet noise, I'm sure you didn't hear the 21-gun salute, the playing of
taps, or my words to the widow and parents of Capt. Fresques as I gave
them their son's flag on behalf of the president of the United States
and all those veterans and servicemen and women who understand the
sacrifices they have endured.
A four-ship flyby is a display of respect the Air Force pays to those
who give their lives in defense of freedom. We are professional aviators
and take our jobs seriously, and on June 15 what the letter writer
witnessed was four officers lining up to pay their ultimate respects.
The letter writer asks, "Whom do we thank for the morning air show?"
The 56th Fighter Wing will call for you, and forward your thanks to the
widow and parents of Capt. Fresques, and thank them for you, for it was
in their honor that my pilots flew the most honorable formation of their
lives.
Lt. Col. Scott Pleus
CO 63rd Fighter Squadron
Luke Air Force Base
----- End forwarded message -----
Message 7
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--> Yak-List message posted by: "Gilles St-Pierre" <ranchlaseigneurie@hotmail.com>
to those who have been kind enough to give me the infos on their`( for sale
planes)
i have inadvertedly erased my messages, sorry if you did not get a reply
sincerely
dr gilles st pierre
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