Hi Ian
I trust you are well, We have just experienced this problem with an LS-4 at Waikerie, highlighted by leaks between the Pitot, Static and TE. We purchased new ESA probes Pitot and a separate Static / TE probe to replace the one with leaking orings and arranged for a Commercial shop to install the new probes. After receipt of the new probes, work commenced !!!!!!!!!!! First thing we found the radio aerial is located in the leading edge of the fin F****** Second thing we found the existing probe could easily be separated with a little heat, to allow the replacement of the dis-functional Oring, could be re-glued (using a fibre-glass resin mixture) together and reinstalled for another 25 years of service. We now have a brand new Pitot and Static / TE probe setup spare (for sale) and a lot of knowledge about What is inside the fin of an LS-4. On the brighter side, an Oring was never meant to last forever (how long might that be). With best wishes, John From: [email protected] [mailto:[email protected]] On Behalf Of Ian Mc Phee Sent: Thursday, 21 March 2013 6:16 PM To: Discussion of issues relating to Soaring in Australia. Subject: [Aus-soaring] Multiprobes and their sockets in fin I am finding many gliders now getting 20 years old when multiprobes were introduced are now nothing but trouble especially with club gliders. Enc is from ESA web site and just a reminder to all Notice: The NBR 70 O-rings will last for the aircrafts life time if the following is observed: the inserted probe should always be clean and slightly lubricated. This ensures that it moves through the O-rings without damaging them. A dirty or dry probe causes friction and will destroy them over time. The mounts in the fins can be replaced but is a bit of work Procedure for replacing ring 3 (type UN and SUN) Remove the adapter from the fuselage and remove the adapter end cap by heating it up to 90°C (195°F, for example by using a hot air gun). The O-ring 3.68x1.78 NBR 70 can now be replaced as described previously. After replacement the end cap has to be glued back into place using an epoxy glue (UHU-plus 300 or similar) and tempered for one hour at approx. 70°C (160°F). Ian McPhee
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