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andrewf
Joined: 16 Aug 2014
Posts: 6
Location: Sydney
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 Posted: Tue Aug 19, 2014 7:32 pm Post subject: Procedure for Emerg gear extension YAK18T |
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Every annual we test the emerg operation of the landing gear on our Yak18T. We test it using the following sequence; Close off the main valve with the gear retracted, then drain the air from the system (using brake lever), then open the reserve tank, then move the UC lever to neutral and the gear will retract. Mostly slamming down hard leg by leg and sometimes the final leg will need the lever moved all the way to 'down' position to extend it. Question; Does anyone have the actual factory procedure? Is there a method to 'buffer' the violent slamming down. I have thought about not draining the air from the system when switching from Main to Reserve and testing it with a few cycles from the reserve bottle but the logic is that this is not an accurate simulation but with no air in the system the extension can be severe. I'd like to be able to properly test the system to procedure while keeping the aeroplane on the jacks - it's not quite that severe but I'm sure you all know what I mean.
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dsavarese0812(at)bellsout
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| Posted: Wed Aug 20, 2014 3:53 am Post subject: Procedure for Emerg gear extension YAK18T |
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I don't have a Yak 18T factory procedure, but I am pretty sure if you use the procedure I have on my web site for a Yak 52 and CJ6, you will find it will eliminate the gear slamming down during the emergency gear extension. The only difference is you don't have to deal with operation from the rear cockpit. So ignor anything related to the rear cockpit. Go to http://www.yak-52.com/maintena.htm. Read through it first and then decide if you want to use it or not. It is different from the procedure you are using and has worked extremely well for probably 15+ years.
Dennis
From: andrewfeneley <feneleyandrew(at)hotmail.com> To: yak-list(at)matronics.com Sent: Tuesday, August 19, 2014 10:32 PM Subject: Procedure for Emerg gear extension YAK18T
--> Yak-List message posted by: "andrewfeneley" <feneleyandrew(at)hotmail.com (feneleyandrew(at)hotmail.com)>Every annual we test the emerg operation of the landing gear on our Yak18T. We test it using the following sequence; Close off the main valve with the gear retracted, then drain the air from the system (using brake lever), then open the reserve tank, then move the UC lever to neutral and the gear will retract. Mostly slamming down hard leg by leg and sometimes the final leg will need the lever moved all the way to 'down' position to extend it. Question; Does anyone have the actual factory procedure? Is there a method to 'buffer' the violent slamming down. I have thought about not draining the air from the system when switching from Main to Reserve and testing it with a few cycles from the reserve bottle but the logic is that this is not an accurate simulation but with no air in the system the extension can be severe. I'd like to be able to properly test the system to procedure while keeping the aeroplane on the jacks - it's not quite that severe but I'm sure you all know w! hat I mean.--------Yak 18T Sydney VH-IBTRead this topic online here:http://forums.matronics.com/viewtopic.php?p=428819#428819http://www.matronics.com/Navigator?Yak-List; - MATRONICS WEB FORUMS -_-= Same great content also available via the Web Forums!http:/; - List Contribution Web Site -http://www.=====
[quote][b]
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andrewf
Joined: 16 Aug 2014
Posts: 6
Location: Sydney
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| Posted: Wed Aug 20, 2014 5:12 am Post subject: Re: Procedure for Emerg gear extension YAK18T |
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Thanks Dennis, This procedure doesn't drain the air pre emerg. ext. this must help and will use your procedure next annual. Thanks
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dsavarese0812(at)bellsout
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| Posted: Wed Aug 20, 2014 5:26 am Post subject: Procedure for Emerg gear extension YAK18T |
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That's correct because draining the air from the system as you were doing eliminates the back pressure in the gear actuators which acts like a "shock absorber" during gear extension. It will definitely work and the gear will not slam down during the emergency gear extension test. Just remember, once the system is filled (main air on) the lower the air pressure in the system, the faster the gear will come down because there is less back pressure. Any questions, don't hesitate to ask.
Dennis
| Quote: | A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1 |
On 8/20/2014 8:12 AM, andrewfeneley wrote:
[quote] [b]
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dsavarese0812(at)bellsout
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| Posted: Wed Aug 20, 2014 5:37 am Post subject: Procedure for Emerg gear extension YAK18T |
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But I don't think the emergency side has restrictors. The 52 isn't suppose to have them on the emergency side, for obvious reasons. But some people do put them in on the emergency side of the shuttle valves to try and slow the gear extension down a bit. What many people don't think about though is the fact that the opposite side air pressure in the actuator (ie: the UP side) is the "shock absorber" during gear extension. So as the air pressure in the system goes down, gear extension is more rapid. On jacks, the faster the gear comes down, the more shaking the airplane does.
Dennis
| Quote: | A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1 |
On 8/20/2014 8:24 AM, doug sapp wrote:
[quote] Does the 18T have restrictors in the system like the CJ6?
Doug
On Wed, Aug 20, 2014 at 6:12 AM, andrewfeneley <feneleyandrew(at)hotmail.com (feneleyandrew(at)hotmail.com)> wrote:
[b]
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vindscreenmw(at)bigpond.c
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| Posted: Thu Aug 21, 2014 2:15 am Post subject: Procedure for Emerg gear extension YAK18T |
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Andrew I have used Dennis procedure for a number of years, afterEgon told me about it, and it reduces that slamming during an emergancy extension, very effectively.
Mark
Sent from my iPad
On Aug 20, 2014, at 9:52 PM, "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> wrote:
[quote]I don't have a Yak 18T factory procedure, but I am pretty sure if you use the procedure I have on my web site for a Yak 52 and CJ6, you will find it will eliminate the gear slamming down during the emergency gear extension. The only difference is you don't have to deal with operation from the rear cockpit. So ignor anything related to the rear cockpit. Go to http://www.yak-52.com/maintena.htm. Read through it first and then decide if you want to use it or not. It is different from the procedure you are using and has worked extremely well for probably 15+ years.
Dennis
From: andrewfeneley <feneleyandrew(at)hotmail.com (feneleyandrew(at)hotmail.com)> To: yak-list(at)matronics.com (yak-list(at)matronics.com) Sent: Tuesday, August 19, 2014 10:32 PM Subject: Yak-List: Procedure for Emerg gear extension YAK18T
--> Yak-List message posted by: "andrewfeneley" <feneleyandrew(at)hotmail.com (feneleyandrew(at)hotmail.com)>Every annual we test the emerg operation of the landing gear on our Yak18T. We test it using the following sequence; Close off the main valve with the gear retracted, then drain the air from the system (using brake lever), then open the reserve tank, then move the UC lever to neutral and the gear will retract. Mostly slamming down hard leg by leg and sometimes the final leg will need the lever moved all the way to 'down' position to extend it. Question; Does anyone have the actual factory procedure? Is there a method to 'buffer' the violent slamming down. I have thought about not draining the air from the system when switching from Main to Reserve and testing it with a few cycles from the reserve bottle but the logic is that this is not an accurate simulation but with no air in the system the extension can be severe. I'd like to be able to properly test the system to procedure while keeping the aeroplane on the jacks - it's not quite that severe but I'm sure you all know w! hat I mean.--------Yak 18T Sydney VH-IBTRead this topic online here:http://forums.matronics.com/viewtopic.php?p=428819#428819http://www.matronics.com/Navigator?Yak-List; - MATRONICS WEB FORUMS -b Forums!http:/; - List Contribution Web Site -http://www.=====
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ot;">http://www.matronics.com/contribution
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| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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andrewf
Joined: 16 Aug 2014
Posts: 6
Location: Sydney
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| Posted: Thu Aug 21, 2014 3:35 am Post subject: Re: Procedure for Emerg gear extension YAK18T |
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Thanks All. Mark, I'll pass this onto Clive to compare notes we were all discussing it during IBT annual. Cheers.
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