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Duncan McFadyean
Joined: 18 Jan 2011
Posts: 219
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 Posted: Sun Jan 16, 2022 8:49 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop |
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I feel another LAA mod coming on!
do not archive.
| Quote: | On 16 January 2022 at 11:18 John Wighton <john(at)wighton.net> wrote:
The AAIB report is up to their usual high standard. However, the trend l can see being analysed is insufficient (or ineffective) aircraft type training and nothing to do with the nominal design of the Europa. Does it mention non-compliance to the design specification?
I don't see an analysis of the recovered door(s) and measurement of the shoot bolt length against the design requirement.
10 to 12mm of protruding pin is needed. Is this an inspection item on a Europa permit inspection or renewal? If not, why not?
I have looked at about a dozen Europa since the UglyMod appeared on the scene. All have different shoot bolt lengths and tapers. Some are filed to a distinct point whereas others have a minimal taper and have a generous radius at the end.
As the operation of the door is linked to the dimensions and shape of the shoot bolts l would have thought this an obvious place to ensure consistency. Minimum design spec - shoot bolt extended length and shape being the inspection criterion.
The LAA Mod may avoid some clumsy mishandling of the doors, but it does not necessarily fix the root cause.
Go and measure your shoot bolts.
Now measure the size and shape of the holes in the door surround. These are nominally a clearance fit to the shoot bolt diameter. Is the hole clean, would it benefit from a bush (tube) to ensure a good fit with the (proper length) shoot bolt?
Some food for though. Until the next door off event.
--------
John Wighton
Europa XS trigear G-IPOD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505687#505687
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John Wighton
Joined: 18 May 2010
Posts: 241
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Duncan McFadyean
Joined: 18 Jan 2011
Posts: 219
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| Posted: Mon Jan 17, 2022 4:27 am Post subject: Mandatory U.K. LAA permit directive. Shoot-Bolt stop |
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The outer (doorframe) guides were supplied with Classic kit no.175, mid 1990's.
I substituted with brass, due to concerns of galling. No doors lost (yet).
BTW, I also have guides that position the doors for closing squarely in to the frame, reduces gap and limits for-aft movement of the doors when closed; maybe fuselage flexing in flight is providing differential movement betwix door and frame and helping some shoot bolts to 'walk out'??
Duncan McF
do not archive | Quote: | On 17 January 2022 at 04:40 Westnet Mail <kingsnjan(at)westnet.com.au> wrote:
| Quote: | >...ensuring that there is a gap of only 1 - 2 mm between the guides in the door and the frame, bond them in ..."
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I have seen several Europas with the aluminium guides DL07 installed in the door frames however, there were no such guides included in my kit and no mention whatsoever in my build manual. It appears the idea was introduced belatedly and I suspect with the introduction of the XS.
Since I have never had any problems with the shoot bolts, I have elected to let sleeping dogs lie.
Best regards
Kingsley in Oz
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budyerly@msn.com
Joined: 05 Oct 2019
Posts: 286
Location: Florida USA
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| Posted: Mon Jan 17, 2022 3:47 pm Post subject: Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop |
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Duncan,
I did the same Oilite bushing. It's not broke so I'm not fixing it either.
Bud.
For John and others,
I looked for a post/drawings I did some time ago for a builder who manufactured his door shoot bolts too short, and too wonky (misaligned).
It happens. Getting the shoot bolts aligned can be a challenge on an existing plane if they were mucked up. The Classic shoot bolts are very pointy, and the XS are more rounded. This difference in length made for issues for some as the Build Manual wanted at lease a 3/8-10mm penetration between the door and frame. The Classic tips were a bit long to clear and we had a couple builders in the States decide to file off the tip to clear their bushings in the sill, but forgot to adjust for the total length and as a result, the doors departed. (OOPS)
Classics only had door guides in the doors, and the door frame was reinforced for the load with glass. Many of us used the Oilite brass bushings for fuselage mounted guides in the early days. Worked like a champ. Now the DL07 is standard and pretty convenient.
The key was the dimension of each bolt extension when in the locked position and how far it protruded into the DLO7 on the sill. Those of us making our own from scratch had to sometimes extend our bushings out far enough to meet the requirement, yet have enough space to clear the door shoot bolt guide so the door would come down and completely pull down ready to latch without hanging up on the guides.
After many years 12AY still works darned adequate. Pull the door down and simply nudge the door handle forward and it slaps home.
My check of the penetration was easy before installing the interior but more importantly, the ideal clearance between shoot bolt and frame guide seemed to be 1/32 inch so a couple of those 1/2 inch L washers for the wing pins worked well as an alignment spacer during cure up. I slipped them in with some grease using a 1/2 in aluminum rod to hold it on the fuselage side and then closed the door and used the rod to initially align then fully closed the door mechanism latch. The shoot bolt drove out the aluminum rod and I did the following:
I continued to move the sill bushing in my case until the door handle moved flawlessly and the two guides were separated only by the spacer.
Later my faster technique did it all in one by reduxing in the door shoot bolt guide until tacky, then setting the sill DL07 temporarily I closed the door, aligned the door mechanism and then openned the door and using the above technique glued in the Door Sill shoot bolt with washer and allowed to cure.
Sorry I can't find that more detailed text and I thought I had a drawing also.
For those of you doing metal guides and other work around, the most important thing is how far the bolt is in the sill guide. Personally, I use 1/2 inch or 12 mm as my minimum penetration distance. Rebuild your rods using the new manual if you need better penetration, it's cheap and easy. Then learn how to use screws to secure your mechanism cover rather than gluing it on. Yuck. Who glues on what should be an inspection panel? But we can only do that sort of thing overseas.
As far as trying to save the side of the airplane, that is where the nicely shaped metal can help. I just touch up my paint. It never fails, at an airshow somebody has to slam the door down with the doors closed. I can't fix stupid. Maybe I can, NO MORE AIRSHOWS!
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danbish99
Joined: 16 May 2015
Posts: 10
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