46-05-01\tBOEING: (Was Mandatory Note 4 of AD-558-1 and Mandatory Note 4 of AD 524- 1.) Applies to Model 247 Aircraft. \n\tCompliance required not later than next major overhaul. \n\tReplace the elbow located between the engine fuel pump discharge port and the fuel discharge line with a steel elbow of the type AN 822-10 or an equivalent steel elbow to suit the particular pump and discharge line installation. Also, ascertain that there is adequate clearance between the elbow and adjacent engine parts. \n\t(Boeing Service Bulletin No. 3 of D-6134 dated December 17, 1945, covers this same subject.)