Astir Locking Collars

[Astir .]

Has anyone got any definitive documentation regarding the fitting of "thin"
shims on Astir wing spigots that are approaching the 5mm limit on collars
I recall having something a few years ago, but unable to retrieve it
Fully aware of the engineering logic of too thick shims and ball/spigot
relationship

[JJ Sinclair[_2_]]

On Sunday, August 25, 2013 3:57:26 AM UTC-7, Astir. wrote:
> Has anyone got any definitive documentation regarding the fitting of "thin"
>
> shims on Astir wing spigots that are approaching the 5mm limit on collars
>
> I recall having something a few years ago, but unable to retrieve it
>
> Fully aware of the engineering logic of too thick shims and ball/spigot
>
> relationship

Are you saying that the 'little balls' inside your locked lift fittings, have reached the bottom of the spigot 'groove' and the wings are not tightly secured to the fuselage and you are considering rectifying this condition using shims?

[Astir .]

The rotating collars are locking the wings correctly, the FM states there
needs to be a 5mm gap shown on the locking collar, which is now
approaching
The paperwork I had as far as I recall was from Grob to the UK air cadets
who flew a fleet of Grob gliders, which stated that a thin shim could be
placed onto the wing spigots to take up wear. In "little balls"





At 12:41 25 August 2013, JJ Sinclair wrote:
>On Sunday, August 25, 2013 3:57:26 AM UTC-7, Astir. wrote:
>> Has anyone got any definitive documentation regarding the fitting of
>"thin"
>>
>> shims on Astir wing spigots that are approaching the 5mm limit on
collars
>>
>> I recall having something a few years ago, but unable to retrieve it
>>
>> Fully aware of the engineering logic of too thick shims and ball/spigot
>>
>> relationship
>
>Are you saying that the 'little balls' inside your locked lift fittings,
>have reached the bottom of the spigot 'groove' and the wings are not
>tightly secured to the fuselage and you are considering rectifying this
>condition using shims?
>

[[email protected]]

I believe the approved fix for this is to install ball, of a larger diamiter.

[Eric Munk]

Same here. Replaced the worn balls with ones of larger diameter on several
gliders. Easy fix, works very well. Parts available through TC-holder.

At 01:29 26 August 2013, wrote:
>I believe the approved fix for this is to install ball, of a larger
>diamite=
>r.
>I'll check on that. They are available.=20
>
>The idea of installing thin shims does not work on Grobs. The attachment
>is=
> quite different than other gliders.
>
>Roberet Mudd
>Composite Aircraft Repair
>Parts and service for Grob gliders and motorgliders=20
>Moriarty NM=20
>
>
>
>On Sunday, August 25, 2013 7:54:04 AM UTC-6, Astir. wrote:
>> The rotating collars are locking the wings correctly, the FM states
>there=
> needs to be a 5mm gap shown on the locking collar, which is now
>approachin=
>g The paperwork I had as far as I recall was from Grob to the UK air
>cadets=
> who flew a fleet of Grob gliders, which stated that a thin shim could be
>p=
>laced onto the wing spigots to take up wear. In "little balls" At 12:41
25
>=
>August 2013, JJ Sinclair wrote: >On Sunday, August 25, 2013 3:57:26 AM
>UTC-=
>7, Astir. wrote: >> Has anyone got any definitive documentation regarding
>t=
>he fitting of >"thin" >> >> shims on Astir wing spigots that are
>approachin=
>g the 5mm limit on collars >> >> I recall having something a few years
>ago,=
> but unable to retrieve it >> >> Fully aware of the engineering logic of
>to=
>o thick shims and ball/spigot >> >> relationship > >Are you saying that
>the=
> 'little balls' inside your locked lift fittings, >have reached the
bottom
>=
>of the spigot 'groove' and the wings are not >tightly secured to the
>fusela=
>ge and you are considering rectifying this >condition using shims? >
>
>