OLDWILLWAYNE MOONEY AIRCRAFT CORPORATION SERVICE AND MAINTENANCE MANUAL M20M Repair scratches on spar caps that are not deeper than .003 inch by sanding with No. 400 abrasive paper. Remove no more than .005 inch of material. Inspect the sanded area; use dye penetrant to be sure that the scratch is completely removed. Clean and prime area where the protective coating has been removed. 2. SPAR CAP REPAIR. Spar caps outboard of STA 103 consist of sheet metal angles backed up with RIVET CODES FOR REPAIRS m4 MS20470AD4-xx 4~ 5 MSE10470AD5-xx ~P 4 aluminum extrusions from STA 103 to near STA 150. Replace or repair damaged extrusions. Do not allow splices in a repaired extrusion to coincide with a spar-web splice when avoidable. Splice sheet-metal angles with an extrusion of equal area, picking up existing fasteners. Add extra fasteners to bring the minimum number of fasteners to six AD-5 rivets per side in the vertical flange, and nine AD-4 (or six AD-5) rivets per side in the horizontal flange. (See Figure ~7 5 MS204;1~AD5-xx ~BP CR516-xx 3´• SPAR WEB REPAIR. Repair all damage to spar webs in accordance with AC 43.13-( If there is extensive damage to a web that cannot be repaired as outlined in AC 43.13-( consult Mooney Aircraft 51-7). Corporation, PRODUCT SUPPORT DEPARTMENT giving exact location and extent of damage. STUB SPAR REPAIR 51-13-03 (Stub spar splice at wing STA 34.5 3.0) (849 Figure 51-8). 1. Cut the stub spar halfway between existing rivets as required by the damage incurred. HF~ 1_ FLAT CCND.’K -sol2loos~-7