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airmanv2

Joined: 01 Dec 2013
Posts: 49
Location: France - Normandy

Posted: Sat Aug 19, 2017 8:00 pm Post subject: gear retraction problem

Hello

yesterday I've intended to make a fly and clean the plane in preparation for Saturday airshow . ...



I had a major problem with the gear: just after take off it was not possible to retract.....

Move up the gear handle  and only the left green light switch off, and no red light switch on. the 3 external red gear indicators stay out....

so i moved down the handle and i got the " greens.

the air pressure was enough at 25/30 Atm.

so i move up again the gear handle and nothing happens. 3 greens remains. So i put the handle on down position and land again without problem.



Guy on the ground reported that they saw the gear retraction non completed after take off . for them, the main gear only move for about 30° from vertical position before to come back at vertical position. Because of distance and position they were unable to give information for the nose gear position .



So what can be done . I can't fly any more with no gear retraction ...



please help 



best regards



Bruno

_________________
Fly safe

draftsjust417(at)gmail.co
Guest

Posted: Sat Aug 19, 2017 8:28 pm Post subject: gear retraction problem

Good morning Bruno...

 Several years ago I had a very similar problem with my CJ6A, except I (apparently) had NO movement in my gear when I moved the handle up. 

 It turns out, the check valve for my emergency gear extension was corroded, and leaking "down air" from the emergency bottle/supply. This prevented my gear from coming up. 

 Installing a new check valve (from Doug Sapp) was not difficult, and the problem disappeared.   

Perhaps this will help?

 Justin 

 N280NC 

On Aug 20, 2017 12:08 AM, "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> wrote: 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 

 Hello

 

 

 yesterday I've intended to make a fly and clean the plane in preparation for Saturday airshow . ...

 

 I had a major problem with the gear: just after take off it was not possible to retract.....

 Move up the gear handle  and only the left green light switch off, and no red light switch on. the 3 external red gear indicators stay out....

 so i moved down the handle and i got the " greens.

 the air pressure was enough at 25/30 Atm.

 so i move up again the gear handle and nothing happens. 3 greens remains. So i put the handle on down position and land again without problem.

 

 Guy on the ground reported that they saw the gear retraction non completed after take off . for them, the main gear only move for about 30° from vertical position before to come back at vertical position. Because of distance and position they were unable to give information for the nose gear position .

 

 So what can be done . I can't fly any more with no gear retraction ...

 

 please help

 

 best regards

 

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=471988#471988

 

 

 

 

 

 

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cerveirapinto(at)gmail.co
Guest

Posted: Sun Aug 20, 2017 3:29 am Post subject: gear retraction problem

Hi BrunoProbably you have a air leak somewhere in the system . Probably on gear handle valve.

Put the airplane on jacks and fill the system with 45 kg/cm2 from a exterior botlle of air.

Listen to air leaks first. If no leaks heard ..

Test gear. 

If  all the air in the system goes away and gear not moving completely up, the gear handle valve need to be fixed.

Cheers

2017-08-20 4:00 GMT+00:00 airmanv2 <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>:

 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 

 Hello

 

 

 yesterday I've intended to make a fly and clean the plane in preparation for Saturday airshow . ...

 

 I had a major problem with the gear: just after take off it was not possible to retract.....

 Move up the gear handle  and only the left green light switch off, and no red light switch on. the 3 external red gear indicators stay out....

 so i moved down the handle and i got the " greens.

 the air pressure was enough at 25/30 Atm.

 so i move up again the gear handle and nothing happens. 3 greens remains. So i put the handle on down position and land again without problem.

 

 Guy on the ground reported that they saw the gear retraction non completed after take off . for them, the main gear only move for about 30° from vertical position before to come back at vertical position. Because of distance and position they were unable to give information for the nose gear position .

 

 So what can be done . I can't fly any more with no gear retraction ...

 

 please help

 

 best regards

 

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=471988#471988

 

 

 

 

 

 

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-- 

Pedro Cerveira Pinto

dsavarese0812(at)bellsout
Guest

Posted: Sun Aug 20, 2017 6:53 am Post subject: gear retraction problem

Highly probable it is a bad check valve as previously described.

Dennis

       From: Pedro Cerveira Pinto <cerveirapinto(at)gmail.com>

 To: yak-list(at)matronics.com 

 Sent: Sunday, August 20, 2017 7:33 AM

 Subject: Re: gear retraction problem

Hi BrunoProbably you have a air leak somewhere in the system . Probably on gear handle valve.

Put the airplane on jacks and fill the system with 45 kg/cm2 from a exterior botlle of air.

Listen to air leaks first. If no leaks heard .

Test gear. 

If  all the air in the system goes away and gear not moving completely up, the gear handle valve need to be fixed.

Cheers

2017-08-20 4:00 GMT+00:00 airmanv2 <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>:

 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 Hello

 yesterday I've intended to make a fly and clean the plane in preparation for Saturday airshow . ...

 I had a major problem with the gear: just after take off it was not possible to retract.....

 Move up the gear handle  and only the left green light switch off, and no red light switch on. the 3 external red gear indicators stay out....

 so i moved down the handle and i got the " greens.

 the air pressure was enough at 25/30 Atm.

 so i move up again the gear handle and nothing happens. 3 greens remains. So i put the handle on down position and land again without problem.

 Guy on the ground reported that they saw the gear retraction non completed after take off . for them, the main gear only move for about 30° from vertical position before to come back at vertical position. Because of distance and position they were unable to give information for the nose gear position .

 So what can be done . I can't fly any more with no gear retraction ...

 please help

 best regards

 Bruno

 --------

 Fly safe

 Read this topic online here:

 http://forums.matronics.com/ viewtopic.php?p=471988#471988

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Pedro Cerveira Pinto

dantpayne(at)icloud.com
Guest

Posted: Mon Aug 21, 2017 1:45 pm Post subject: gear retraction problem

Call me

423-682-1408



-Dan



Sent from my iPhone



 	  Quote: 	
		   On Aug 20, 2017, at 12:00 AM, airmanv2 <bruno.blanchard2(at)gmail.com> wrote:

 

 

 

 Hello

 

 

 yesterday I've intended to make a fly and clean the plane in preparation for Saturday airshow . ...

 

 I had a major problem with the gear: just after take off it was not possible to retract.....

 Move up the gear handle  and only the left green light switch off, and no red light switch on. the 3 external red gear indicators stay out....

 so i moved down the handle and i got the " greens.

 the air pressure was enough at 25/30 Atm.

 so i move up again the gear handle and nothing happens. 3 greens remains. So i put the handle on down position and land again without problem.

 

 Guy on the ground reported that they saw the gear retraction non completed after take off . for them, the main gear only move for about 30° from vertical position before to come back at vertical position. Because of distance and position they were unable to give information for the nose gear position .

 

 So what can be done . I can't fly any more with no gear retraction ...

 

 please help 

 

 best regards

 

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=471988#471988

wlannon(at)shaw.ca
Guest

Posted: Mon Aug 21, 2017 5:39 pm Post subject: gear retraction problem

Hi Bruno;



As Dennis and others have already suggested your problem is very likely a 

check valve on the LH firewall that is leaking internally and allowing 

normal operating system air pressure to pressurize the emergency system 

which of course goes directly to Gear Down.



Not an unusual failure and, as Bob Schroeder noted,  could be an indicator 

of other moisture related problems as well.



See the attached schematic for location.



A good practice to avoid moisture related failure of course is to replace 

your water filter innards on a regular basis.  That periodicity will be 

dependent to a large degree on relative humidity in your operating area. 

Also a very good practice to check your brake system moisture trap (snot 

valve) on a regular basis, preferably after every flight.  If you find 

moisture here your water filter servicing period is not adequate.



Walt

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airmanv2

Joined: 01 Dec 2013
Posts: 49
Location: France - Normandy

Posted: Tue Aug 22, 2017 10:37 pm Post subject: Re: gear retraction problem

Hi , 

thank you for your advices.

we raise the plane and tested the gear retraction. 

it was ok with the remaining air at 25 atm, we tested up and down 4 times till the air remains at about 10 atm.

it works well that is strange.....

i ve noticed an air leak inside the main corp of the front gear handle when gear up position,  

perhaps the front gear handle to replace ? 

what do you think about that Doug?

Best regards

Bruno

_________________
Fly safe

dsavarese0812(at)bellsout
Guest

Posted: Wed Aug 23, 2017 12:31 am Post subject: gear retraction problem

3 questions. 

- did you do and emergency gear extension test?  From your description of how you accomplished the gear retraction test, you did not mention you tested the emergency gear extension. 

- did you try retracting and extending the gear from the rear cockpit?

- if you did attempt to retract and extend the gear from the rear cockpit, did you listen for for the same air leak you heard coming from the front cockpit?

Dennis



Sent from my iPad



 	  Quote: 	
		   On Aug 23, 2017, at 1:37 AM, airmanv2 <bruno.blanchard2(at)gmail.com> wrote:

 

 

 

 Hi , 

 thank you for your advices.

 we raise the plane and tested the gear retraction. 

 it was ok with the remaining air at 25 atm, we tested up and down 4 times till the air remains at about 10 atm.

 it works well that is strange.....

 i ve noticed an air leak inside the main corp of the front gear handle when gear up position,  

 perhaps the front gear handle to replace ? 

 what do you think about that Doug?

 Best regards

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472081#472081

dougsappllc(at)gmail.com
Guest

Posted: Wed Aug 23, 2017 8:54 am Post subject: gear retraction problem

What do I think???  I think you seem to be a person willing to take risks which are way out of proportion to the reward.  However that being said, it would appear that you are in need of replacing your QSF-2A valve---OR---- you have a gear actuator leaking and that air is venting out of your front gear valve.  Dennis asks good questions, answers will help sort this all out.



Doug



  	          		Virus-free. www.avast.com 		 	 [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]



On Tue, Aug 22, 2017 at 11:37 PM, airmanv2 <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 

 Hi ,

 thank you for your advices.

 we raise the plane and tested the gear retraction.

 it was ok with the remaining air at 25 atm, we tested up and down 4 times till the air remains at about 10 atm.

 it works well that is strange.....

 i ve noticed an air leak inside the main corp of the front gear handle when gear up position,

 perhaps the front gear handle to replace ?

 what do you think about that Doug?

 Best regards

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472081#472081

 

 

 

 

 

 

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Dawg

Joined: 19 May 2013
Posts: 355

Posted: Wed Aug 23, 2017 9:22 am Post subject: gear retraction problem

when u have lemons u make lemonade. We do the best we can with what we have.

Creative.



On Aug 24, 2017, at 01:53, doug sapp <dougsappllc(at)gmail.com (dougsappllc(at)gmail.com)> wrote:

 	  Quote: 	
		  What do I think???  I think you seem to be a person willing to take risks which are way out of proportion to the reward.  However that being said, it would appear that you are in need of replacing your QSF-2A valve---OR---- you have a gear actuator leaking and that air is venting out of your front gear valve.  Dennis asks good questions, answers will help sort this all out.



Doug



  	          		Virus-free. www.avast.com 		 	 [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]



On Tue, Aug 22, 2017 at 11:37 PM, airmanv2 <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 

 Hi ,

 thank you for your advices.

 we raise the plane and tested the gear retraction.

 it was ok with the remaining air at 25 atm, we tested up and down 4 times till the air remains at about 10 atm.

 it works well that is strange.....

 i ve noticed an air leak inside the main corp of the front gear handle when gear up position,

 perhaps the front gear handle to replace ?

 what do you think about that Doug?

 Best regards

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472081#472081

 

 

 

 

 

 

 ====================================

 List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Yak-List

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_________________
Dawg

wlannon(at)shaw.ca
Guest

Posted: Wed Aug 23, 2017 9:38 am Post subject: gear retraction problem

Cute!!  Of course you do this every year to comply with your Annual 

Inspection requirements.



Walt



--

airmanv2

Joined: 01 Dec 2013
Posts: 49
Location: France - Normandy

Posted: Wed Aug 23, 2017 11:38 am Post subject: Re: gear retraction problem

Hello again, 



so I've made a flight this evening and the same problem appears again: after take off the gear do not retract.., visualy from outside, the main gear moved about 30° from vertical position. Gear handle was positionned down , 3 greens and land safely .

yesterday evening when acft was raised, I've done 4 test up/down and its look like good. pressure at the beginning was 25 and at the 4th 12 remaining .`

I do not test the emergency extension.

its is not possible to move the rear gear handle as the UK CAA blocked it as also for the Flaps rear handle.. (Im under UK registration)

this morning i refiled the air bottle at 45atm before this evening start up, i took off with 35 and landed also with about 35 atm 

the QS2 valve isn't for the brake repartition?

thanks for help 

Bruno

_________________
Fly safe

dougsappllc(at)gmail.com
Guest

Posted: Wed Aug 23, 2017 11:58 am Post subject: gear retraction problem

Bruno,The correct p/n is QSF-2A of which there are three in your aircraft, both flap valves and the fwd gear valve.

You are correct the QS2 is the brake differential valve in the belly.

Doug

On Wed, Aug 23, 2017 at 12:38 PM, airmanv2 <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 

 Hello again,

 

 so I've made a flight this evening and the same problem appears again: after take off the gear do not retract.., visualy from outside, the main gear moved about 30° from vertical position. Gear handle was positionned down , 3 greens and land safely .

 yesterday evening when acft was raised, I've done 4 test up/down and its look like good. pressure at the beginning was 25 and at the 4th 12 remaining .`

 I do not test the emergency extension.

 its is not possible to move the rear gear handle as the UK CAA blocked it as also for the Flaps rear handle.. (Im under UK registration)

 this morning i refiled the air bottle at 45atm before this evening start up, i took off with 35 and landed also with about 35 atm

 the QS2 valve isn't for the brake repartition?

 thanks for help

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472104#472104

 

 

 

 

 

 

 ====================================

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hkgibby(at)yahoo.com
Guest

Posted: Wed Aug 23, 2017 12:38 pm Post subject: gear retraction problem

Bruno-



Recommend you pull and check all 8 diverter valves (2 per gear and two for flap control) and rebuild or replace as necessary.   Most likely your issue.



Hoot



Sent from my iPhone



 	  Quote: 	
		   On Aug 23, 2017, at 3:38 PM, airmanv2 <bruno.blanchard2(at)gmail.com> wrote:

 

 

 

 Hello again, 

 

 so I've made a flight this evening and the same problem appears again: after take off the gear do not retract.., visualy from outside, the main gear moved about 30° from vertical position. Gear handle was positionned down , 3 greens and land safely .

 yesterday evening when acft was raised, I've done 4 test up/down and its look like good. pressure at the beginning was 25 and at the 4th 12 remaining .`

 I do not test the emergency extension.

 its is not possible to move the rear gear handle as the UK CAA blocked it as also for the Flaps rear handle.. (Im under UK registration)

 this morning i refiled the air bottle at 45atm before this evening start up, i took off with 35 and landed also with about 35 atm 

 the QS2 valve isn't for the brake repartition?

 thanks for help 

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472104#472104

jblake207(at)comcast.net
Guest

Posted: Thu Aug 24, 2017 5:02 am Post subject: gear retraction problem

Sounds like the same issue I had... turned out to be main gear actuators.  Doug Sapp rebuilt them and no problems since.  JB



 



   From: "doug sapp" <dougsappllc(at)gmail.com>

To: yak-list(at)matronics.com

Sent: Wednesday, August 23, 2017 2:57:55 PM

Subject: Re: Re: gear retraction problem

 



 Bruno, The correct p/n is QSF-2A of which there are three in your aircraft, both flap valves and the fwd gear valve.

 



 You are correct the QS2 is the brake differential valve in the belly.

 



 Doug



 

 On Wed, Aug 23, 2017 at 12:38 PM, airmanv2 <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> wrote:

  	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>



Hello again,



so I've made a flight this evening and the same problem appears again: after take off the gear do not retract.., visualy from outside, the main gear moved about 30° from vertical position. Gear handle was positionned down , 3 greens and land safely .

yesterday evening when acft was raised, I've done 4 test up/down and its look like good. pressure at the beginning was 25 and at the 4th 12 remaining .`

I do not test the emergency extension.

its is not possible to move the rear gear handle as the UK CAA blocked it as also for the Flaps rear handle.. (Im under UK registration)

this morning i refiled the air bottle at 45atm before this evening start up, i took off with 35 and landed also with about 35 atm

the QS2 valve isn't for the brake repartition?

thanks for help

Bruno



--------

Fly safe





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=472104#472104

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cerveirapinto(at)gmail.co
Guest

Posted: Thu Aug 24, 2017 5:21 am Post subject: gear retraction problem

Hi again Bruno. As I anticipated you have a leak in the gear handle valve. Dismount and replace the O Ring inside. Simple as that.

Regards

Em 23/08/2017 07:41, "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> escreveu: 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 

 Hi ,

 thank you for your advices.

 we raise the plane and tested the gear retraction.

 it was ok with the remaining air at 25 atm, we tested up and down 4 times till the air remains at about 10 atm.

 it works well that is strange.....

 i ve noticed an air leak inside the main corp of the front gear handle when gear up position,

 perhaps the front gear handle to replace ?

 what do you think about that Doug?

 Best regards

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=472081#472081

 

 

 

 

 

 

 ====================================

 List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?Yak-List

 ====================================

  FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

 ====================================

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 ====================================

 b Site -

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 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

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Ernie

Joined: 11 Jan 2006
Posts: 513

Posted: Thu Aug 24, 2017 5:27 am Post subject: gear retraction problem

That simple huh?



On Thu, Aug 24, 2017 at 9:25 AM Pedro Cerveira Pinto <cerveirapinto(at)gmail.com (cerveirapinto(at)gmail.com)> wrote:



 	  Quote: 	
		  Hi again Bruno. As I anticipated you have a leak in the gear handle valve. Dismount and replace the O Ring inside. Simple as that.

Regards





Em 23/08/2017 07:41, "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> escreveu:



 	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>

 

 Hi ,

 thank you for your advices.

 we raise the plane and tested the gear retraction.

 it was ok with the remaining air at 25 atm, we tested up and down 4 times till the air remains at about 10 atm.

 it works well that is strange.....

 i ve noticed an air leak inside the main corp of the front gear handle when gear up position,

 perhaps the front gear handle to replace ?

 what do you think about that Doug?

 Best regards

 Bruno

 

 --------

 Fly safe

 

 

 

 

 Read this topic online here:

 

 	




 	  Quote: 	
		  http://forums.matronics.com/viewtopic.php?p=472081#472081 	




 	  Quote: 	
		  

 

 

 

 

 

 

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dsavarese0812(at)bellsout
Guest

Posted: Thu Aug 24, 2017 5:29 am Post subject: gear retraction problem

Pedro,

I'm assuming you've disassembled a gear/flap selector valve beforesince 

you said to replace the O-ring?



If Bruno hasn't tested the system the way I suggested, he may be just 

spinning his wheels.  ie: did he do a gear retraction test with the rear 

gear selector (with the front in neutral of course) and was there air 

leaking from the rear gear selectorwhen he did this test?  If yes, the 

problem is not the front gear selector.

Dennis



A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 8/24/2017 9:21 AM, Pedro Cerveira Pinto wrote:

 	  Quote: 	
		   Hi again Bruno.

 As I anticipated you have a leak in the gear handle valve. Dismount 

 and replace the O Ring inside. Simple as that.

 Regards



 Em 23/08/2017 07:41, "airmanv2" <bruno.blanchard2(at)gmail.com 

 <mailto:bruno.blanchard2(at)gmail.com>> escreveu:



     

     <bruno.blanchard2(at)gmail.com <mailto:bruno.blanchard2(at)gmail.com>>



     Hi ,

     thank you for your advices.

     we raise the plane and tested the gear retraction.

     it was ok with the remaining air at 25 atm, we tested up and down

     4 times till the air remains at about 10 atm.

     it works well that is strange.....

     i ve noticed an air leak inside the main corp of the front gear

     handle when gear up position,

     perhaps the front gear handle to replace ?

     what do you think about that Doug?

     Best regards

     Bruno



     --------

     Fly safe





     Read this topic online here:



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marty.jpm(at)gmail.com
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Posted: Thu Aug 24, 2017 5:56 am Post subject: gear retraction problem

Hi,



The same for me on my YAK 52 in France few weeks ago.  Bruno DUCREUX fixed it the same way.

JP 

Le 24 août 2017 15:08, "JON" <jblake207(at)comcast.net (jblake207(at)comcast.net)> a écrit : 	  Quote: 	
		  Sounds like the same issue I had... turned out to be main gear actuators.  Doug Sapp rebuilt them and no problems since.  JB



 



   From: "doug sapp" <dougsappllc(at)gmail.com (dougsappllc(at)gmail.com)>

To: yak-list(at)matronics.com (yak-list(at)matronics.com)

Sent: Wednesday, August 23, 2017 2:57:55 PM

Subject: Re: Yak-List: Re: gear retraction problem

 



 Bruno, The correct p/n is QSF-2A of which there are three in your aircraft, both flap valves and the fwd gear valve.

 



 You are correct the QS2 is the brake differential valve in the belly.

 



 Doug



 

 On Wed, Aug 23, 2017 at 12:38 PM, airmanv2 <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)> wrote:

  	  Quote: 	
		  --> Yak-List message posted by: "airmanv2" <bruno.blanchard2(at)gmail.com (bruno.blanchard2(at)gmail.com)>



Hello again,



so I've made a flight this evening and the same problem appears again: after take off the gear do not retract.., visualy from outside, the main gear moved about 30° from vertical position. Gear handle was positionned down , 3 greens and land safely .

yesterday evening when acft was raised, I've done 4 test up/down and its look like good. pressure at the beginning was 25 and at the 4th 12 remaining .`

I do not test the emergency extension.

its is not possible to move the rear gear handle as the UK CAA blocked it as also for the Flaps rear handle.. (Im under UK registration)

this morning i refiled the air bottle at 45atm before this evening start up, i took off with 35 and landed also with about 35 atm

the QS2 valve isn't for the brake repartition?

thanks for help

Bruno



--------

Fly safe





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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Tue Aug 29, 2017 9:36 am Post subject: Re: gear retraction problem

Bruno



I have the sister of your aircraft and of course served together in the PLA and also have the restricted rear gear and flap function as its a mandatory modification required by the UK CAA.



I would remove the rear cockpit gear restrictor plate and do the test Dennis has given as the will test both gear handle valves. It's good practice to excercise the rear cockpit one periodically, refit handle restrictor plate after tests.



Doug sells kits to rebuild the diverter valves and I did all mine when we brought the a/c onto the UK register. There was corrosion in about three of them so they were replaced and upgraded.



Good luck

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