From my perspective and experience with the IS28B2 I am surprised that
the safety alert does not go further.
If the spar join with this expanding tapered pin system is heavily
greased with a high viscocity grease, the pins can on occasion feel
fully done up when using the tool but a load test from the wing tips may
then show that there is in fact still slack in the junction. The
loading acts to push out the excess grease and the pins can then be
expanded further.
You need to do a load test on the junction to ensure that you have
completed the take up of the pins into the taper. Same thing with the
LS3a tailplane - you load the tips to ensure the stabiliser is pulled
fully aft onto the taper of the mounting pins.
However a load test may possibly not detect that things are hugely out
of whack if it happens that the pins haven't even started properly but
have been forcefully expanded against the spar flange plates with the
wing spar flange plates hardly engaged.
I would have thought that the alert might also refer to a duplicate
check of the rigging. Also that a load test is appropriate - after all
best practice has shown that a load tests are appropriate to proof of
control connection (proof by restraint).
regards
Roger Druce
On 3/09/2010 7:38 PM, Pam Kurstjens wrote:
-----Original Message-----
From: BGA Subscription service [mailto:[email protected]]
Sent: Friday, 3 September 2010 7:22 PM
To: [email protected]
Subject: BGA News update - Safety
There is an update on the BGA website;
Rigging Safety Alert
The BGA has issued a safety alert concerning rigging of SZD Foka, Cobra,
Bocian, Jaskolka, Schempp-Hirth SHK& Austria series and any other sailplane
with an expanding pin/cone main rigging pin.
Please see the Safety Alert identifying a possible safety issue with the
rigging procedure at
http://www.gliding.co.uk/bgainfo/safety/documents/safetyalert020910.pdf.
You can view the update by going clicking the following link;
http://www.gliding.co.uk/bgainfo/safety/newsletters.htm
BGA Website>> BGA Info>> Safety
To edit your subscriptions, please go to
https://www.gliding.co.uk/subscriptions/login.php.
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