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TOST tow releases. New TBO of Tost releases April 19, 2001 TBO 2000 launches accordingly 10.000 actuations. Life limiting part is the release spring, with a life expectancy of about 10.000 actuations. With about 5 actuations in normal flight operation, this is, as before, 2000 launches. Should you have in pure training operation more actuations per launch, the TBO is reduced accordingly (with 8 actuations per launch to 1250 launches).This decision in in the responsibility of the aircraft holder. If both releases are actuated together (like in Germany) both releases have to be sent for overhaul after 2000 launches. The life limit of 4 years is replaced by a manufacturer's recommendation. The new regulation had been published from the LBA in the "NfL" on July 12, 2001 and therefore is valid right now
Further explanation: These new time limits apply only to release mechanisms supplied new or overhauled by the manufacturer on or after this date (April 19, 2001) or releases that were still within their legal time limits at that time.
Example: new release had been installed April 18th, 1997 would NOT be now legal for use today since it was already beyond it's legal time limit or TBO period. A factory new manufactured, or TOST factory overhauled release with proper documentation and operation manual installed on or after April 19, 2001 would however come under the new TBO limits for use accordingly up to 10.000 actuations and as further described. Certain very old release mechanisms of the first types may also at the discretion of the manufacturer because of their age and construction type and fatigue and as deemed by the manufacturer may also still be overhauled for use in vintage aircraft but can also have limits reduced to the original time limits.
Trade in your old release for an US$80 core credit (most releases).