Astir Locking Collars

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

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?

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?

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

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?