FAA AD 2011-12-10ROBINSON HELICOPTERR22 , R44等ブレード表面剥離目視点検参考R-22 ROBINSON SB-103R-44 ROBINSON SB-72参考http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/7950dff2185691fa862578b2004d6912/$FILE/2011-12-10.pdf