SB 08-53-01 - McFarlane Aviation Products

(14) Remove the upper cowl and drill four 0.475-inch holes where the pilot holes were drilled in thestep above. Deburr and Alodine the holes.(15) Temporarily install the new upper cowl with S2319-65 or S2319-66 Grommets and S2319 CowlFasteners (use from S2319C4 to S2319C9 length cowl fasteners as necessary to get thecorrect length). Always use the shortest S2319 Cowl Fastener that you can.(16) With the new upper cowl installed, inspect the five J7444-42 Shock Mounts for forward, aft,and side-to-side stress.(a)Adjust or replace the 0591009-2 Shock Mount Adjustment Plates as necessary to makesure that there is no stress on the shock mounts.(17) Install the new S2319-65 or S2319-66 Grommets and S2319 Cowl Fasteners (use fromS2319C4 to S2319C9 length cowl fasteners as necessary to get the correct length). Alwaysuse the shortest S2319 Cowl Fastener that you can.H. Locate holes and install S2319-65 or S2319-66 Grommets and S2319 Cowl Fasteners on the leftand the right side lower edges of the 0552212-245 Upper Engine Cowl (use from S2319C4 toS2319C9 length studs as necessary to get the correct length) as necessary. Always use the shortestS2319 Cowl Fastener that you can.(1) Locate the five left receptacle holes for the S2319-65 or S2319-66 Grommets in the lower cowl.Mark and drill five Number 30 pilot holes in the upper cowl.(2) Make sure the Number 30 size pilot holes are aligned with the center of each receptacle hole inthe lower cowl and adjust the hole locations as necessary.(3) Remove the upper cowl.(4) Drill five 0.475-inch diameter holes where the Number 30 size holes were drilled in the stepabove. Deburr and Alodine the holes.(5) Install new S2319-65 or S2319-66 Grommets and S2319 Cowl Fasteners (use from S2319C4to S2319C9 length studs as necessary to get the correct length) as necessary. Always use theshortest S2319 Cowl Fastener that you can.(6) Do Steps 23H(1) thru 23H(5) again for the right receptacle holes for the S2319-65 or S2319-66Grommets.I. Put the 0552212-245 Upper Engine Cowl in position.(1) Temporarily install the upper cowl.(2) Trace marks for the left and right lower edges of the upper cowl.(3) Remove the upper cowl and measure the distance between the new trace mark made in thestep above, and the trace mark made from the original upper cowl.(4) Use the measurements taken from the step above, and trim the new upper cowl to match theoriginal upper cowl trace marks.(5) Deburr and Alodine the engine cowl edges as necessary.(6) Remove and discard the eight S2319-50 Receptacles in the upper nose-cap.(7) (Airplanes 17281110 thru 17281216 and 172S9083 thru 172S9638) Do SB08-53-02 now,before you continue with this Service Bulletin.(8) Remove the spacer material from under the aft edge of the engine cowl.SB08-53-01January 28, 2008 Page 17