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© Avco Corporation. Filed by the FAA in regulations.gov docket FAA-2012-0983; AD 2013-10-04 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

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TEXTRON Lycoming SERVICE 652 Oliver Street Williamsport, PA 17701 U.S.A. INSTRUCTION 717/323-6181 DATE: October 5, 1979 Service Instruction No. 1391 Engineering Aspects are FAA (DER) Approved SUBJECT: Exhaust Manifold Tube Alignment MODELS AFFECTED: In0-3d0=8 L-6073-61A. including L110-540-F, models with serial numbers models with serial numbers up to including L-1570-68A.

TIME OF COMPLIANCE: During engine overhaul or at owner's discretion.

the straight exhaust marred tubes en 17023 with P/N IW-15850 3. In adjusting exhaust manitole tubes, best tube can be rotated to effect the alignment. beneficial See figure 2. In some tubes have be replaced by P/N LW-15849. The a 30 bend which will aid in exhaust it nuts one turn to facilialignment of the exhaust manifold tubes tate alignment. alignment has been transition assembly. figure 1. de-tor? cylinders working back to beginning with bend tubes. in the field will accept the no. the assembly. Tighten each atpart equaily and uniformly until a ine proceaure for the installation of the 204 inch pounds has been applied.

tubes is as follows:

1. Remove Marman clamps from exhaust tubes on bo th sides of the transition assembly.

Remove rear four exhaust tubes. NOTE Assemble exhaust tubes P/N's IW- Two types of coupling latch nuts may and IW-15850 as indicated in figure found on 2.00 inch v-band coupli-

1. ngs. A split type lock nut, as described with a specified torque of 85 If the replacement of an exhaust manifold inch pounds; Or a drilled hex nut component new gasket should be used at re-assembly. reguires the removal of a gasket, a Secue value of 5 inch pren. secured with safety having a 77023 - 77022 LW-15850 LW-15849 LW-15849 LW-15849- TI0-540-A,-F T10-540-J,-R Figure 1. Exaggerated View Comparing New and Old Tubes Page 1 of 2

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Service Instruction No. 1391

MODIFIED TUBES

TRANSITION

ASSEMBLY Figure 2. View Showing Alignment of Modified Tube With Transition Assembly PARTS DATA:

PART NO. DESCRIPTION TIO-540 QTY. REQD.

LW-15849 LW-15849 PIPES PIPE, Exhaust - left intermediate Exhaust - right intermediate A, F, J,R J,R 1 LW-15850 PIPE, Exhaust - right intermediate A,F 1 78083 GASKET, V-band coupling - 2.00 OD tube A, F,J,R 2 LW-15619 GASKET, Exhaust flange A, F,J,R 12 Page 2 of 2