In the maintenance instructions from l'Hotellier (attached in
http://www2.lba.de/dokumente/lta/1993-001.pdf pages 11 and 12)

At 20:47 13 April 2016, Casey wrote:


The interval recommended by L'Hotellier (and taken over by several
national
authorities as mandatory) is ten years or 3000 hours (whichever comes
first). Most manufacturers of aircraft who use L'Hotellier balls have
specified their replacement during the 3,000 and 6,000 hours and so
intervals. IIRC Schempp-Hirth has closer intervals (500 hours?) due to
them
being fitted in a different way and they have had threaded ends fail.

Erik,
Where do see that L'Hotellier recommends ten yrs or 3000 hrs? Also my
glider manufacturer has no mention of this in the life extensions.
I emailed them this morning and all they sent me was the maintenance
instruction and there is no mention in that of this recommendation.