70-15-12 SHORT BROTHERS AND HARLAND, LIMITED: Amdt. 39-1043. Applies to Model SC-7, Series III airplanes.
To prevent cracking around the drain boss of the engine plenum chamber, within the next 25 hours' time in service after the effective date of this AD, unless already accomplished, incorporate Modification No. 1034 by installing flexible drain lines between the engine plenum chamber and bottom heat shield on both engines in accordance with Shorts Bulletin No. 71-56, Revision 1, dated May 20, 1970, or a later ARB-approved issue or an FAA approved equivalent.
This amendment becomes effective July 23, 1970.