REFLECTOR: Nose gear not extending durning emergency extension

Rene Dugas dugasd at bellsouth.net
Fri Oct 9 18:18:18 CDT 2009 

Glen
Checked out Lake Norman, can I be adopted?  I could live maybe in the  
hanger or club house?  I have a Velocity.

Rene' Dugas
Sent from my iPhone 3GS


On Oct 8, 2009, at 12:48 PM, "Glenn Babcock" <glennbabcock at roadrunner.com 
 > wrote:

> Jon,
>
> Mine falls very smoothly. I just replaced my gas spring too, but  
> even with the old weak one it would come down without help.
>
> I've seen one on another Velocity that wouldn't fall without help,  
> and I believe they replaced the hydraulic cylinder to fix it.  For  
> some reason it was binding internally.
>
> Regards,
> Glenn
> N697RG SERG (flying)
> http://lakenormanairpark.org/
>
> --------------------------------------------------
> From: "Bachman, Jonathan" <Jonathan.Bachman at mtsi-va.com>
> Sent: Thursday, October 08, 2009 1:14 PM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Subject: REFLECTOR: Nose gear not extending durning emergency  
> extension
>
>> Does anybody have trouble getting the nose gear to fall out of the  
>> nose
>> gear well when performing a static emergency extension?  I just  
>> replaced
>> the gas spring.  But when I try an emergency extension, the mains  
>> fall
>> down and lock easily, but the nose gear just droops a bit, then
>> eventually extends and locks fine.  I'm wondering if the vibration  
>> and
>> air loads will help it extend during flight when an emergency  
>> extension
>> is needed, but it still causes me some concern.  I had thought it was
>> just hanging up on the nose gear door (I only have a single nose  
>> door),
>> But I disconnected it and it still doesn't fall out as quickly as I'd
>> like.  I've checked all the pivot points and everything seems free  
>> and
>> in good condition. It just seems like the resistance from the fluid  
>> in
>> the nose gear actuator is holding it up.
>>
>> Thanks
>>
>> Jon
>>
>> -----Original Message-----
>> From: reflector-bounces at tvbf.org [mailto:reflector- 
>> bounces at tvbf.org] On
>> Behalf Of Glenn Babcock
>> Sent: Thursday, October 08, 2009 7:12 AM
>> To: Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Nose gear didn't lock
>>
>> Scott,
>>
>> The purpose of the gas spring is to help push the gear over center  
>> when
>> using the dump valve.  Opening the dump valve releases the pressure  
>> on
>> the
>> hydraulic cylinder and the gas spring will then be able to push the
>> overcenter linkage to the limit.
>>
>> But when the gear is operated by the pump the hydraulic cylinder is
>> pushing
>> the overcenter linkage and overpowers the gas spring easily.  So what
>> you
>> need to look at is the hydraulic system.  Perform a retract test and
>> using
>> the gear pump as usual lower the gear.  Try to reproduce the scenario
>> where
>> the gear switch is down, the pump has stopped but the nose gear  
>> light is
>> not
>> on.  Then check the position of the overcenter linkage and see if  
>> it is
>> touching the stop inside the keel.
>>
>> If not, you may have a bad pressure switch, a bad hydraulic  
>> cylinder, a
>> blocked line, or some other issue causing the gear pump to stop  
>> before
>> the
>> cylinder reaches the end of its travel.  Try opening the dump valve  
>> and
>> see
>> if the linkage moves any further.
>>
>> It's also possible it's just out of rig.  If so, you need to find out
>> why.
>> For instance, did the rod end jam nut come loose?
>>
>> When the system works correctly the cylinder should extend to its  
>> limit
>> with
>> the overcenter linkage just touching the stop.  It should NOT press
>> against
>> the stop, the pressure must be carried by the cylinder.  The linkage
>> should
>> be ~1/4" past center.  The gear pump stops when the cylinder reaches
>> it's
>> limit and the pressure increases in the system, causing the pressure
>> switch
>> to open.
>>
>> I had a similar issue and it was a bad pressure switch.  Once I  
>> replaced
>> it
>> the system was back to normal.
>>
>> Regards,
>> Glenn
>> N697RG SERG (flying)
>> http://lakenormanairpark.org/
>>
>> --------------------------------------------------
>> From: "Chuck Jensen" <cjensen at dts9000.com>
>> Sent: Thursday, October 08, 2009 8:17 AM
>> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>> Subject: Re: REFLECTOR: Nose gear didn't lock
>>
>>> Scott,
>>>
>>> During the ground retract test, when you didn't get the green light,
>> did
>>> you check to see if the assembly was over-center?  If it was, then  
>>> as
>>> Terry suggests, your proximity switch may need to be adjusted.   
>>> But if
>> you
>>> use your stick and find that you have to nudge it a little to  
>>> finally
>> go
>>> over center, then your light is good but you have a mechanical  
>>> issue,
>> be
>>> it spring or whatever....that's waaaaaay above my pay grade.
>>>
>>> Chuck
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: reflector-bounces at tvbf.org [mailto:reflector- 
>>> bounces at tvbf.org]On
>>> Behalf Of Scott Derrick
>>> Sent: Wednesday, October 07, 2009 9:42 PM
>>> To: Velocity Aircraft Owners and Builders list
>>> Subject: REFLECTOR: Nose gear didn't lock
>>>
>>>
>>> On my last flight when I let the gear down I had a unsafe light and
>> the
>>> nose gear light was not lit, the pump light indicated it had shut  
>>> off,
>> I
>>> gave a little jerk on the stick to increase the G force momentarily
>> and
>>> the green light came on.
>>>
>>> later I was performing a gear retraction to test, when I let the  
>>> gear
>>> down I got the same indication. I kicked the nose gear tire and the
>>> light came on.
>>>
>>> Is this a symptom of the nose gas strut going soft?
>>>
>>> I have previously in the last couple months made 20+ retraction  
>>> tests
>>> with all OK.
>>>
>>> Scott
>>>
>>>
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