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Date: Thu, 29 Mar 2012 15:55:32 -0400
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From: Danny <danny@n107sd.com>
Subject: Re: [LML] Re: LNC2 gear diagnosis
Organization: N107SD, Inc.
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Well, after making a few calls I found this ball valve is a special 
order item with my local companies (meaning higher cost).  Michelle (@ 
Lancair) has one on the shelf and I still have a small credit on my 
account with them so it's on the way.  Sure hope this solve my problem.

Danny
LNC2-360, 550 hours
N 38° 43' 25.7"
W 77° 30' 38.6"

On 29.03.2012 11:46, N20087 wrote:
> Danny
>
> If you have to change the valve I suggest replacing it with a three
> way type that will dump to the pump reservoir. This will eliminate a
> potential failure mode in the pump. You can get the valve from
> Lancair. It is used on the legacy and of much better quality than the
> earlier 360 valves
>
> Tom
>
> Sent from my iPad
>
> On Mar 29, 2012, at 9:02 AM, "Danny"  wrote:
>
>> *
>>
>> Nope, I took the NW actuator out of the system and installed a gauge
>> on that pressure line to check. I also played with the dump valve
>> today to see if a slight movement of the handle made a difference
>> … it did. This weekend I’ll cap it and see what kind of pressure
>> I get but my guess is that’s the problem.
>>
>> Danny
>>
>> LNC2-360, 550 hours
>>
>> N 38° 43' 25.7"
>>
>> W 77° 30' 38.6"
>>
>> FROM: Sky2high@aol.com [1] [mailto:Sky2high@aol.com]
>> SENT: Wednesday, March 28, 2012 9:06 AM
>> TO: lml@lancaironline.net [2]
>> SUBJECT: [LML] Re: LNC2 gear diagnosis
>>
>> Danny,
>>
>> From what you reported it would seem that the nose gear actuator is
>> the real problem. How about the door actuators? One possible
>> analysis is that you don't see the 1200 psi because the leak is
>> greater at the higher pressure and then slows a bit as the pressure
>> goes down or the actuator has its worse leak at full retraction and
>> less when the piston is not at the full retraction position...
>>
>> Scott Krueger
>>
>> In a message dated 3/27/2012 10:32:25 P.M. Central Daylight Time,
>> danny@n107sd.com [3] writes:
>>
>>> If any of you have a suggestion, I’d appreciate your input.
>>>
>>> On my last flight home, with no early signs of failure, my gear
>>> pump was tripping on about every 2 seconds to maintain pressure. I
>>> figured I had a leaky actuator and would have to rebuild it to
>>> resolve this; no big deal. I found one leaking and figured where
>>> there is one, there may be more. So, I’m rebuilding all of them.
>>> But, before doing so, I put a gauge on the high pressure side of
>>> the pump to see if I had internal leaks there too. What I found
>>> was that my pump will only pressurize to about 950 psi (should be
>>> ~1200 psi) and then it bleeds down slowly. I tried to adjust the
>>> pressure switch but it made very little difference. To verify the
>>> bleeding, I isolated all actuators out of the system except the
>>> nose wheel. I put the gauge on the high pressure side of the NW
>>> actuator line, selected gear up to pressurize the system, and then
>>> quickly crawled under the plane to look at the gauge. It was
>>> bleeding down so fast that by the time I got down there to look at
>>> it (~2 sec.), it had already lost about 200 psi and then bled down
>>> the rest of the way in about 7 more seconds. So, and here’s the
>>> question, do I have a faulty gear dump valve, a leaky pump, or
>>> both?
>>>
>>> Danny
>>>
>>> LNC2-360, ~550 hours
>>>
>>> N 38° 43' 25.7"
>>>
>>> W 77° 30' 38.6"
>
>
> Links:
> ------
> [1] mailto:Sky2high@aol.com
> [2] mailto:lml@lancaironline.net
> [3] mailto:danny@n107sd.com
> [4] mailto:danny@n107sd.com

-- 
Danny
LNC2-360, 550 hours