70-09-04 MCDONNELL DOUGLAS: Amdt. 39-982. Applies to Douglas DC-9 series airplanes certificated in all categories as listed in Douglas Aircraft Company Service Bulletin No. 28-16, Revision 1, dated January 9, 1970, or later FAA approved revision. \n\n\tCompliance required within the next 800 hours time in service after the effective date of this AD, unless already accomplished. \n\n\tTo prevent a possible fuel interruption due to tire tread separation striking the fire-x-fuel shutoff valve cable system, accomplish the following. \n\n\tInstall a protective guard over the fire-x-fuel shutoff valve return idler pulley bracket located in the main landing gear wheel wells in accordance with the instructions of Douglas Aircraft Co. Service Bulletin No. 28-16, Revision 1, dated January 9, 1970, or later FAA approved revision or an equivalent installation approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis amendment becomes effective June 2, 1970.