FYI, regarding the possible FAA AMOC: Here is a recent response to an inquiry someone made to the SSA and posted elsewhere. The authors names have been removed, but this is a direct quote:

XXXX,

Ken Sorenson asked me to respond to your inquiry regarding the status of the Blanik L-13.

To date, the FAA has not approved any modification which would allow the Blanik L-13 to return to service in the US. Private (as in unofficial, off-the-record) discussions between the SSA and individuals within the FAA lead us to believe that it is doubtful that the FAA will ever approve one, as they raised concerns that came to light as a result of the fatal accident which resulted in the grounding. Their concerns center around the original basis of structural certification of the aircraft, issues which they raised but which have never been addressed/resolved by the certifying agency.

Having said that, attached is a recent letter (October, 2015) from Blanik Aircraft CZ via Blanik America to the L-13 owners of record. I will note that the FAA has not - as of this writing - approved this modification. As stated in the letter, the modification would extend (not add) the airframe life to 6000 hours. So if your airframe has over 6000 hours, it would not be eligible for modification.

Regards,

XXXX XXXX