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access door hinges

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jan_de_jong(at)casema.nl
Guest

Posted: Mon Oct 28, 2013 3:50 am Post subject: access door hinges

Hi all,



This may be an old trick but I newly discovered it.

A small access door hinge of 2 x 0.5" one side, 0.25" + 0.5" + 0.25" the 

other, can be made to come apart easily by putting in a 4 x 0.5" pin 

instead of a 1 x 2" pin. Moving it 0.25" does it. The abutting hinge pin 

sections are contained by a split pin or a piece of safety wire through 

a 1mm hole at each end.

The advantage is that only very little room at one end of the hinge is 

needed.



Jan de Jong

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rlborger(at)mac.com
Guest

Posted: Mon Oct 28, 2013 6:24 am Post subject: access door hinges

Jan,



I’m sorry, but I’m a visual person.  Do you have a picture you could post?



Blue Skies & Tailwinds,

Bob Borger



On Oct 28, 2013, at 6:49 AM, Jan de Jong <jan_de_jong(at)casema.nl> wrote:






Hi all,



This may be an old trick but I newly discovered it.

A small access door hinge of 2 x 0.5" one side, 0.25" + 0.5" + 0.25" the other, can be made to come apart easily by putting in a 4 x 0.5" pin instead of a 1 x 2" pin. Moving it 0.25" does it. The abutting hinge pin sections are contained by a split pin or a piece of safety wire through a 1mm hole at each end.

The advantage is that only very little room at one end of the hinge is needed.



Jan de Jong

- The Matronics Europa-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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jan_de_jong(at)casema.nl
Guest

Posted: Sun Nov 10, 2013 11:45 am Post subject: access door hinges

Further to my remarks regarding access door hinge pins: what I believe I 

have learned.

I hope the pictures (ancient 2002 digital camera) make it a bit more 

clear than last time.



1 To remove all excuse for not opening an access door before flight I 

provide the door with a hinge and a quarter turn dzus fastener with a 

winged stud for finger operation.



2 Planning

- In closed condition the fastener stud wing and the fastener receptacle 

have parallel long dimensions; to be able to mount

the receptacle along the hole edge and have the stud wing parallel to 

the wind in flight the hinge should also be mounted

parallel to the wind. I did differently and will suffer (I will make a 

right angle receptacle as soon as I acquire a choice of

spring steel wire).

- If in sandwich skin: determine the contours - from inside to outside 

(picture): line 1 door sandwich to door flange, line 2

hole outline, line 3 door outline, line 4 glass-glass flange to 

sandwich; beware the room needed for hinge flanges (see 4 and

5 below) and the fastener receptacle



3 Making

- Remove the inner skin and foam with router bit and sandpaper between 

lines 1 and 4, fair the edges

- 2 bid between lines 1 and 4, overlapping, and well overlapping the 

foam outside line 4, peel ply

- Cut out the door along line 3, then tape up for release, then put in 

place and tape flush with the fuselage outside skin

- 2 bid between lines 1 and 4, well overlapping the foam outside 4, peel ply

- File and sand the flange produced (for the door to sit against) to 

size and shape



4 More planning

- The hinge line must be outside line 3 for the access door to open well

- The hinge flanges need flox beds for the hinges to end up flush with 

the outer skin

- The hinge pin cannot be put in and taken out without surgery unless 

cut up in pieces in advance



5 More making

- Make the hinge with a sectioned hinge pin and holes each end for a 

cotter pin or safety wire

- Remove the flange between 2 and 3 and a little out towards 4 where the 

outer hinge flange will be; leave the door (inside

line 3) alone

- Put the hinge together with greased moving parts, position, apply flox 

beds, and apply pop rivets when cured



6 Check

- Displacing the hinge pin sections 1/4" should now release the door easily



Jan de Jong

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