AD 47-10-34

47-10-34 LOCKHEED: (Was Service Note 5 of AD-763-3.) Applies to All Model 49 Serials Up to and Including 2088.

(a) Revised exhaust system ball joint assemblies (Solar P/N CV-611 and CV-615-1 through CV-615-18, reworked in accordance with Solar E. O. Nos. 16696 and 16697), as called for in LAC Service Bulletin 49/SB-93 and AD 47-10-15, above, may continue to be used, provided a rigid inspection for condition is made in accordance with LAC Service Information Letter No. 42, except that the lowest periodic inspection interval listed on each operator's approved aircraft maintenance specification may be used instead of the 30-hour period referred to in the Lockheed Letter.

(b) The revised exhaust system ball joints described in part (a) of this Note may be reinstalled after completion of the 250-hour period referred to in LAC Service Information Letter No. 42, provided that each ball joint is disassembled as far as practicable at the end of these 250- hour periods and unsatisfactory parts are replaced. This 250-hour disassembly period may be increased upon application by an operator and approval by the FAA, provided the service record of the components used by the operator justified the increase requested.

(c) When the revised exhaust system ball joints, described in part (a) of this AD, are replaced by new type Solar ball joint parts, as listed in LAC Service Bulletin 49/SB-94, the overhaul period for exhaust system ball joints may be established as the same as the engine overhaul period approved for the operator involved. Intermediate inspections similar to those described in LAC Service Information Letter No. 42 shall be conducted on the new type ball joint assemblies at intervals as specified in the operator' approved aircraft maintenance specification.