This is the pertinent SAIB from 1996:

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/2d69931bd1dab16b862572250070589f/c1850358cba7bf4a8625721f0052ec5c/$FILE/ACE-96-10.pdf

Larry Ruggiero
Carolina Soaring Assoc, Spartanburg SC