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Mandatory U.K. LAA permit directive. Shoot-Bolt stop
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Hitchflight

Joined: 22 Feb 2018
Posts: 92
Location: Derbyshire, England

Posted: Wed Nov 03, 2021 8:46 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

https://www.theeuropaclub.org/news/mandatory-laa-directive-all-europa-aircraft

graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Fri Nov 05, 2021 12:05 am Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

i am curious as to the incident that prompted this mod, how the LAA came to produce and issue it and also make the required parts available through its shop. Was the club involved?

_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk

John Wighton

Joined: 18 May 2010
Posts: 240

Posted: Fri Nov 05, 2021 2:18 am Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

My opinion on this MPD (not that there appears to have been any consultation about it):-



An MPD for a checklist item?  OK, I can see the implications of not shutting the door can be serious, but so could many other things that are on the CHECKLIST.



Will we need to tie a long piece of string to the pitot cover (to remind us to remove it) or to the control locks?



I have taxied out with the door ajar (I stick my arm out and hold onto the external door handle) but have a check item that reminds me to close the door and latch it.  DOORS CLOSED & LATCHED.



The rear pin is prone to miss its hole if the weather is warm (doors expand and try to straighten themselves), but having a pin-stop external to the aircraft is not desirable.



The LAA has taken the lead on this, does anybody know what Europa Aircraft is not supporting this MPD?  How about progress with the MUUW increase and the BRS Mod?

_________________
John Wighton
Europa XS trigear G-IPOD

JonathanMilbank

Joined: 14 Apr 2012
Posts: 384
Location: Aberdeen area

Posted: Fri Nov 05, 2021 3:11 am Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Some of you aren't going to like my response, but as a retired military and commercial pilot of 42 years experience, it is my belief that this MPD is good. Checklists alone aren't a sufficient safeguard for this known Europa problem. I've both taken off with the rear shoot-bolt not engaged and on another occasion been distracted to the extent of somehow missing this item on the checklist, but became aware of something amiss just before getting airborne.



During my aviation career of mostly multi crew flying, I've experienced and also been made aware of others who have managed to miss items on checklists. For almost 25 years I've had an ongoing concern about this particular weakness in the Europa canopy design; worrying when other group members are flying my aircraft. I've tried remedies of my own, including an additional handle inside the canopy towards the rear, to facilitate pilots pulling the rear corner inwards. This MPD seems to be a commonsense solution.

brian.davies44(at)gmail.c
Guest

Posted: Fri Nov 05, 2021 3:45 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

I am sure we all agree that this is a human factors issue involving basic piloting procedures and should not need fixing, but there have now been 8 instances of doors departing the aircraft and the last one involved impact damage to the tail plane and the AAIB demanding action.  Not sure why Europa are not leading the charge but this is a relatively low cost easy thing to do.  The LAA are even creating a Mod kit which they do not need to to do.  There is also the option of a DiY fix.  A lot of work has gone on behind the scenes on this.



Regards

Brian Davies

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



On Fri, Nov 5, 2021 at 10:21 AM John Wighton <john(at)wighton.net (john(at)wighton.net)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "John Wighton" <john(at)wighton.net (john(at)wighton.net)>

 

 My opinion on this MPD (not that there appears to have been any consultation about it):-

 

 An MPD for a checklist item?  OK, I can see the implications of not shutting the door can be serious, but so could many other things that are on the CHECKLIST.

 

 Will we need to tie a long piece of string to the pitot cover (to remind us to remove it) or to the control locks?

 

 I have taxied out with the door ajar (I stick my arm out and hold onto the external door handle) but have a check item that reminds me to close the door and latch it.  DOORS CLOSED & LATCHED.

 

 The rear pin is prone to miss its hole if the weather is warm (doors expand and try to straighten themselves), but having a pin-stop external to the aircraft is not desirable.

 

 The LAA has taken the lead on this, does anybody know what Europa Aircraft is not supporting this MPD?  How about progress with the MUUW increase and the BRS Mod?

 

 --------

 John Wighton

 Europa XS trigear G-IPOD

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=503844#503844

 

 

 

 

 

 

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

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trevord

Joined: 10 Jul 2018
Posts: 32
Location: Auckland

Posted: Fri Nov 05, 2021 8:44 am Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Hello all,



I am completing 272 which was started by Tony Krzyzewski here in New Zealand. One of his early modifications means that this aircraft has THREE bolts securing each door - there is one in the middle - Also the hydraulic lifter was repositioned from original (I now think this is standard) and he spent a lot of time making the doors fit well, so the doors close properly each time, every time and do not bulge out that I understand was a problem from the native design.



I am three years into completing this aircraft with a year to go and it has not been out in the sunshine yet, so I am not sure if the door will bulge and make it fit differently when hot. But considering the aircraft is experimental, should not each builder decide if a change should be made and how it should be done, with your UK LAA just suggesting a possible fix ?



New Zealand tends to "follow suit" with CAA/FAA directives, but I am not sure about the LAA in this case.



I was considering a mod for the future, where I could optionally take a door off and replace with a specially made half-door for sunny day flying (at lower speed) this would be quite nice I think and of course this would be an experimental door - is this not the whole point of experimental aircraft, Innovation through careful experimenting ?



Regards

Trevor

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_________________
Trevor

trevord

Joined: 10 Jul 2018
Posts: 32
Location: Auckland

Posted: Fri Nov 05, 2021 9:01 am Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Hello again,



In response to the mention about adding a string to a pitot cover as if this was a bad idea or overkill...



A friend of mine wrote-off a virtually new Beach Baron by leaving the pitot cover on and when noticing NIL airpeed, rejecting the takeoff - unfortunately the nose wheel came off on the grass over-run and crumpled the fuselage - very odd looking at a new wrecked aircraft - he was undamaged but it took a year to get it all sorted from a single moment of distraction.



I INTEND to have string on my pitot cover, connected to the other covers for things like the fuel vent under the aircraft (Bud Yerly design) which is to protect against the mud dauber wasp from making a home in it and the string to protect me from forgetting to remove that cover which could easily be missed with dire consequences - if all covers are connected with string, then not only can I not forget to remove them, they will be difficult to lose. I saw this idea posted somewhere else and thought it a really good one.



Just a thought

Regards

Trevor

_________________
Trevor

peterz(at)zutrasoft.com
Guest

Posted: Fri Nov 05, 2021 9:26 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Fwiw. My bird has those third bolts, but alas, the rear bolts still can miss the sill. 

But my precheck and idiot light is good enough for me. (did i say that put loud? Lol)

Knock on wood.

Pete

C-gnpz



 	  Quote: 	
		   On Nov 5, 2021, at 12:55 PM, trevord <trevord(at)orcon.net.nz> wrote:

 

 

 

 Hello all,

 

 I am completing 272 which was started by Tony Krzyzewski here in New Zealand. One of his early modifications means that this aircraft has THREE bolts securing each door - there is one in the middle - Also the hydraulic lifter was repositioned from original (I now think this is standard) and he spent a lot of time making the doors fit well, so the doors close properly each time, every time and do not bulge out that I understand was a problem from the native design.

 

 I am three years into completing this aircraft with a year to go and it has not been out in the sunshine yet, so I am not sure if the door will bulge and make it fit differently when hot. But considering the aircraft is experimental, should not each builder decide if a change should be made and how it should be done, with your UK LAA just suggesting a possible fix ?

 

 New Zealand tends to "follow suit" with CAA/FAA directives, but I am not sure about the LAA in this case.

 

 I was considering a mod for the future, where I could optionally take a door off and replace with a specially made half-door for sunny day flying (at lower speed) this would be quite nice I think and of course this would be an experimental door - is this not the whole point of experimental aircraft, Innovation through careful experimenting ?

 

 Regards

 Trevor

 

 --------

 Trevor

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=503927#503927

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/0400door1_copy_108.jpg

brian.davies44(at)gmail.c
Guest

Posted: Fri Nov 05, 2021 11:33 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Hi Trevor,



In the UK, Europas are not experimental.  They operate under a Permit to Fly that requires compliance with CAA/LAA directives. 

Regards

Brian Davies

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



On Fri, Nov 5, 2021 at 6:34 PM trevord <trevord(at)orcon.net.nz (trevord(at)orcon.net.nz)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "trevord" <trevord(at)orcon.net.nz (trevord(at)orcon.net.nz)>

 

 Hello all,

 

 I am completing 272 which was started by Tony Krzyzewski here in New Zealand. One of his early modifications means that this aircraft has THREE bolts securing each door - there is one in the middle - Also the hydraulic lifter was repositioned from original (I now think this is standard) and he spent a lot of time making the doors fit well, so the doors close properly each time, every time and do not bulge out that I understand was a problem from the native design.

 

 I am three years into completing this aircraft with a year to go and it has not been out in the sunshine yet, so I am not sure if the door will bulge and make it fit differently when hot. But considering the aircraft is experimental, should not each builder decide if a change should be made and how it should be done, with your UK LAA just suggesting a possible fix ?

 

 New Zealand tends to "follow suit" with CAA/FAA directives, but I am not sure about the LAA in this case.

 

 I was considering a mod for the future, where I could optionally take a door off and replace with a specially made half-door for sunny day flying (at lower speed) this would be quite nice I think and of course this would be an experimental door - is this not the whole point of experimental aircraft, Innovation through careful experimenting ?

 

 Regards

 Trevor

 

 --------

 Trevor

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=503927#503927

 

 

 

 

 Attachments: 

 

 http://forums.matronics.com//files/0400door1_copy_108.jpg

 

 

 

 ===========

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 ===========

  FORUMS -

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

 ===========

 WIKI -

 errer" target="_blank">http://wiki.matronics.com

 ===========

 b Site -

           -Matt Dralle, List Admin.

 ="noreferrer" target="_blank">https://matronics.com/contribution

 ===========

peterz(at)zutrasoft.com
Guest

Posted: Fri Nov 05, 2021 11:47 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Correction, checked again,  and indeed my center pin does pull the door in enough to cause the rear pin to interfere against the stock door rebate in the worst case.   So i guess the center pin does indeed have the same effect as the new uglymod. 



Cheers,

Pete



 	  Quote: 	
		   On Nov 5, 2021, at 1:25 PM, Pete <peterz(at)zutrasoft.com> wrote:

 

 Fwiw. My bird has those third bolts, but alas, the rear bolts still can miss the sill. 

 But my precheck and idiot light is good enough for me. (did i say that put loud? Lol)

 Knock on wood.

 Pete

 C-gnpz

 

> On Nov 5, 2021, at 12:55 PM, trevord <trevord(at)orcon.net.nz> wrote:

> 

> 

> 

> Hello all,

> 

> I am completing 272 which was started by Tony Krzyzewski here in New Zealand. One of his early modifications means that this aircraft has THREE bolts securing each door - there is one in the middle - Also the hydraulic lifter was repositioned from original (I now think this is standard) and he spent a lot of time making the doors fit well, so the doors close properly each time, every time and do not bulge out that I understand was a problem from the native design.

> 

> I am three years into completing this aircraft with a year to go and it has not been out in the sunshine yet, so I am not sure if the door will bulge and make it fit differently when hot. But considering the aircraft is experimental, should not each builder decide if a change should be made and how it should be done, with your UK LAA just suggesting a possible fix ?

> 

> New Zealand tends to "follow suit" with CAA/FAA directives, but I am not sure about the LAA in this case.

> 

> I was considering a mod for the future, where I could optionally take a door off and replace with a specially made half-door for sunny day flying (at lower speed) this would be quite nice I think and of course this would be an experimental door - is this not the whole point of experimental aircraft, Innovation through careful experimenting ?

> 

> Regards

> Trevor

> 

> --------

> Trevor

> 

> 

> 

> 

> Read this topic online here:

> 

> http://forums.matronics.com/viewtopic.php?p=503927#503927

> 

> 

> 

> 

> Attachments: 

> 

> http://forums.matronics.com//files/0400door1_copy_108.jpg

> 

> 

> 

> 

> 

>

John Wighton

Joined: 18 May 2010
Posts: 240

Posted: Fri Nov 05, 2021 12:19 pm Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Well at least it has a name - Uglymod.



Trevor and others are right - whatever makes things safer is always right.  I ordered my 'kits' (x2) within minutes of them appearing on the LAA Shop site.  I thought I'd just have a bitch about it!



The LAA have been doing their stuff, I would imagine there is influence creeping in from Mike and Joe who are breathing some youthful air into LAA Engineering.



However (bitch mk2 coming), there is a concern that by creating products the LAA is opening itself up in terms of liability - gamekeeper and poacher scenario?

_________________
John Wighton
Europa XS trigear G-IPOD

peterz(at)zutrasoft.com
Guest

Posted: Fri Nov 05, 2021 12:28 pm Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Lol…i was gonna actually start the same name with an F….but thought i’d be more civil 



 	  Quote: 	
		   On Nov 5, 2021, at 4:26 PM, John Wighton <john(at)wighton.net> wrote:

 

 

 

 Well at least it has a name - Uglymod.

 

 Trevor and others are right - whatever makes things safer is always right.  I ordered my 'kits' (x2) within minutes of them appearing on the LAA Shop site.  I thought I'd just have a bitch about it!

 

 The LAA have been doing their stuff, I would imagine there is influence creeping in from Mike and Joe who are breathing some youthful air into LAA Engineering.

 

 However (bitch mk2 coming), there is a concern that by creating products the LAA is opening itself up in terms of liability - gamekeeper and poacher scenario?

 

 --------

 John Wighton

 Europa XS trigear G-IPOD

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=503934#503934

trevord

Joined: 10 Jul 2018
Posts: 32
Location: Auckland

Posted: Fri Nov 05, 2021 1:04 pm Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Thanks John,



In NZ, we can keep the aircraft experimental, provided we are "experimenting" and making changes. From memory, this requires some more paperwork and restrictions. What normally happens, is after a period, it is moved into the Amateur Built category and the builder can do maintenance provided they to a CAA course of a few days, that focuses on paperwork - I have not decided exactly how I am going to proceed because I may choses later to experiment with auxiliary electric wing pods - ha.



We do however have some creeping legislation here, the ADSB has to be signed off by an Avionics LAME even on a homebuilt because it is part of a countrywide certified system, so this has added some complication. 



Back to the shoot bolt - good to hear from peterz that his third bolt works also. I cannot see how this door shape fault is any more dangerous than leaving the wing pins out which is a checklist item of course. I am a checklist person and rigorously pick up my checklist and read through, talking to myself even now after flying 20 odd years flying, so I a not going to take off unless I have completed the checklist, the checklist is PART of the takeoff in my mind PERIOD. 



I am sure once I get the Europa flying, I will be probably more pedantic - I have already started writing the checklist that is specific to my aircraft, for example, checking that the panel heat extractor fan is running by placing my hand over the vent to feel the air and checking I can see the fuel level using the reversing camera that points to the sight gauge positioned BEHIND the pilot and so on ..



Thank you for the feedback guys

Regards

Trevor

_________________
Trevor

kingsnjan(at)westnet.com.
Guest

Posted: Fri Nov 05, 2021 2:54 pm Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Hello Trevor,



You said ......

 	  Quote: 	
		   and he spent a lot of time making the doors fit well, so the doors close properly each time, every time and do not bulge out


	


Do you have the door seals installed?



I found that my doors fitted perfectly and were a delight to open and close UNTIL I installed the door seals when it became a different ball game. 



Regards

Kingsley in Oz

trevord

Joined: 10 Jul 2018
Posts: 32
Location: Auckland

Posted: Fri Nov 05, 2021 3:31 pm Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

Hello Kingsley in Oz,



Yes the door seals are fitted.



Tony was/is a bit of a perfectionist, many aspects of the aircraft were built, re-built and re-built again as Tony improved on what he had already done over and over - the fabulous build log attests to this. I think this is why it took him so long to the extent that, he reached an age where natural ageing affects one's  medical ability to fly and he decided not to fight it, stopped flying and stopped building.



I purchased the aircraft after it had been in a long period of dry storage. Since then, I have had to do a lot of work upgrading as new information and new instruments became available that should be utilised, plus all the mandatory upgrades and replacement of metal parts that just seem to corrode even in a dry garage. 



I think that Tony's repositioning of the gas strut has actually made it into the standard build these days - the effect is NOT to push the door out when closed. Together with the THIRD locking pin, makes it close nicely with a little pull. There is also a HANDLE in exactly the right place (to the rear) so that if the door is closed routinely, the rear pin cannot close outside of the aircraft. 



One of the attractions of buying this aircraft was Tony's initial work - it is either excellent or he has paid for excellent work to be done (e.g. he got it professionally repainted after multiple attempts to paint it himself with a sub-standard product). The work I am doing is taking so long because I am also working to a high standard. If if does not look right, then it is not happening. If your door does not close properly, I am sure the mod is necessary and a good idea. 



When my aircraft is rolled out on a sunny day for the first engine start at some point and the door gets heated-up, it is possible that I may face the same problem. If that happens, I will fix it properly, I have no wish for a self-inflicted incident either.



Following this discussion, I am going to see if I can MAKE the door close wrongly by deliberate mishandling and get back to you if there is new news - I do not want a future door incident to spoil my day either !



Regards

Trevor

_________________
Trevor

peterz(at)zutrasoft.com
Guest

Posted: Fri Nov 05, 2021 4:02 pm Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

a side note:  the door strut repositioning does still bow the door out over time - but in the middle of the arc now instead of the corner.

I have a solution in mind to eliminate any gas strut pressure on the door when fully closed: a small overcenter cam mounted in the channel that receives the end of the gas strut as the door is closed. This will keep all the compressed strut pressures in the fuse channel...... assuming the channel's geometry can take the pressures and not also distort over time - I guess I'll find out 

Cheers,

PeteZ



On Fri, Nov 5, 2021 at 6:44 PM trevord <trevord(at)orcon.net.nz (trevord(at)orcon.net.nz)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "trevord" <trevord(at)orcon.net.nz (trevord(at)orcon.net.nz)>

 

 Hello Kingsley in Oz,

 

 Yes the door seals are fitted.

 

 Tony was/is a bit of a perfectionist, many aspects of the aircraft were built, re-built and re-built again as Tony improved on what he had already done over and over - the fabulous build log attests to this. I think this is why it took him so long to the extent that, he reached an age where natural ageing affects one's  medical ability to fly and he decided not to fight it, stopped flying and stopped building.

 

 I purchased the aircraft after it had been in a long period of dry storage. Since then, I have had to do a lot of work upgrading as new information and new instruments became available that should be utilised, plus all the mandatory upgrades and replacement of metal parts that just seem to corrode even in a dry garage. 

 

 I think that Tony's repositioning of the gas strut has actually made it into the standard build these days - the effect is NOT to push the door out when closed. Together with the THIRD locking pin, makes it close nicely with a little pull. There is also a HANDLE in exactly the right place (to the rear) so that if the door is closed routinely, the rear pin cannot close outside of the aircraft. 

 

 One of the attractions of buying this aircraft was Tony's initial work - it is either excellent or he has paid for excellent work to be done (e.g. he got it professionally repainted after multiple attempts to paint it himself with a sub-standard product). The work I am doing is taking so long because I am also working to a high standard. If if does not look right, then it is not happening. If your door does not close properly, I am sure the mod is necessary and a good idea. 

 

 When my aircraft is rolled out on a sunny day for the first engine start at some point and the door gets heated-up, it is possible that I may face the same problem. If that happens, I will fix it properly, I have no wish for a self-inflicted incident either.

 

 Following this discussion, I am going to see if I can MAKE the door close wrongly by deliberate mishandling and get back to you if there is new news - I do not want a future door incident to spoil my day either !

 

 Regards

 Trevor

 

 --------

 Trevor

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=503938#503938

 

 

 

 

 

 

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

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 ="noreferrer" target="_blank">https://matronics.com/contribution

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clivesutton

Joined: 23 Jan 2013
Posts: 187
Location: KENILWORTH

Posted: Sat Nov 06, 2021 2:55 am Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

If i may make some kind of input to this thread:



I was made aware of the impending issue by Andy Draper some two weeks before this was issued by the LAA.  At the time it was clear that the LAA were under the cosh to do/issue something by the UK AAIB - so that has driven the nature of the timing to a great extent.  Its a UK jurisdiction thing of course and non-UK Members Worldwide are not obligated to implement it - though why not take advantage of the idea anyway?



Regarding the Club/LAA side of things, i did submit some suggestions at the time, largely along the lines of couldn't a warning light operated by microswitches behind the shoot-bolt have satisfied the AAIB's requirements (easy for me as i have this on my aircraft).  Along the lines of making ones own solution I also suggested using the existing door handle shape as a 'mould' for a stop, could the stop be RTV'd to the fuselage side to avoid drilling holes and asked if there was any merit in fitting a stop for the front shoot bolt as well (concerned about how the door would take being slammed shut onto the outside of the stop when extended - as can happen out on the airfield if an open door on a stationary aircraft were to be moved by a gust of wind).  Andy did say he'd consider these things and i think he has, but it was clear that by that time, the LAA solution was well advanced and not really open to much further change.



So has there been a Club input - yes sort of [as above], but limited.  Has Europa Aircraft been involved - no idea, but i suspect not.  Is it a good idea - in my view it is, and i must confess that even with a large red 'Door Open' warning light in the middle of my panel, i came close to missing that cue during one pre-takeoff check as well  (due to distraction - as ever).  Will it actually prevent someone from taking off with an unlatched door - i doubt it - but it further reduces the risk and that has to be good for all of us.



Clive S

clivesutton

Joined: 23 Jan 2013
Posts: 187
Location: KENILWORTH

Posted: Sat Nov 06, 2021 3:02 am Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

PS: i understand the LAA-supplied Shoot-Bolt Stop parts kit is made using Stereo Lithography which is a UV-cured resin process.  



As such (and i did see one at my most recent visit (co-incidentally on the day the MPD was issued), the finish is quite smooth and more geometrically accurate method compared to that typical of the traditional 3D-printed melted fishing line.  



Being UV-cured, i'm hoping it will prove to be more resistant to UV degradation than most plastics.  Not sure the white resin used will suit everyone, but it should be OK for painting.  Time and the huge pool of experience evident on this BB, will tell.

Roland

Joined: 30 Nov 2009
Posts: 334
Location: EDLE

Posted: Sat Nov 06, 2021 11:57 pm Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

I'd found it interesting, how that safety issue was/is approached on the certified Liberty XL2. AFAIK the door latch mechanism is quite similar to that of the Europa.

John Wighton

Joined: 18 May 2010
Posts: 240

Posted: Sat Nov 06, 2021 11:59 pm Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop

SLA and FDM methods are probably both suitable for the door stop.  I looked but could not find any reference to the material or process used by the LAA on the parts they are selling.  I think that is a serious omission for an engineering deliverable.  



Maybe somebody (Clive) can find out?



The choice of material is important.  Whilst doing work for a large aerospace company based near Cambridge we found that they had specified a 3D printing process for parts that were subjected to human waste liquids and subsequent cleaning with bleach based products.   For cost reasons the 3D parts were left bare (no paint), a situation that could have led to the production of gases banned under the Chemical Weapons Convention.



Having specified and used 3D printed parts over the past 23 years, l can recommend that a surface finish is used on them.  That could be primer and paint or a thin GF or carbon ply (great for preventing surface cracks in FDM prints).

_________________
John Wighton
Europa XS trigear G-IPOD

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