for Ronaldsway SBA Back Beam Approach - August 1948.
A more complex procedure involving flying east from the airfield 'overhead'
descending from 3,000 ft to 2,200 ft before turning west, back overhead
the airfield descending to 1,300 ft with another turn over Carrick Bay
onto the final approach track and descending not below 700 ft until the
runway was sighted. Flying the whole procedure would take around