In December 1946, the Search and Rescue Division, at its second session, made recommendations for Standards and
Recommended Practices for Search and Rescue. These were developed by the Secretariat and the then existent Air Navigation
Committee, and were duly submitted to the Council. The proposals were not accepted by the Council in the form in which they
were presented and, on 20 April 1948, were referred back to the Air Navigation Committee for further consideration.
A further draft Annex was then developed in the light of experience gained at Regional Air Navigation Meetings and
eventually was approved in principle by the Air Navigation Commission and circulated to States for comment. Further
development was made by the Air Navigation Commission as a result of States’ comments and the resulting proposals were
adopted by the Council on 25 May 1950 and designated as Annex 12 to the Convention on International Civil Aviation. The
Annex became effective on 1 December 1950 and came into force on 1 March 1951.
Table A shows the origin of subsequent amendments together with a list of the principal subjects involved and the dates
on which the Annex and the amendments were adopted by the Council, when they became effective and when they became
applicable.