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9/8/98 AC 43.13-1B (a) Loose, sheared, or spalled cap screws or bolts. (b) Cracks in the case. (2) Disassemble the gear train and in- spect the propeller shaft, reduction gears and accessory drive gears for nicks, cracks, or spalling. f. Engine-Mount Inspection. (1) Examine the engine flex mounts when applicable, for looseness of engine to mount, distortion, or signs of wear. (2) Inspect the engine-mount structure for bent, cracked, or buckled tubes. (3) Check the adjacent airframe struc- ture firewall for cracks, distortion, or wrinkles. (4) Remove engine-mount bolts and mount hold-down bolts and replace. g. Exhaust-driven Supercharger (Turbo) Inspection. Sudden stoppage of the powerplant can cause the heat in turbine parts to heat-soak the turbine seals and bearings. This excessive heat causes carbon to develop in the seal area and varnish to form on the tur- bine bearings and journals. (1) Inspect all air ducts and connections for air leaks, warpage, or cracks. (2) Remove compressor housing and check the turbine wheel for rubbing or binding, and coke or varnish buildup. NOTE: Turbine turbo supercharger disk seal rubbing is not unusual and may be a normal condition. Consult the engine manufacturer’s inspection procedures and table of limits. h. Accessory and Drive Inspection. Check the drive shaft of each accessory, i.e., magnetos, generators, external superchargers, and pumps for evidence of damage. 8-3. CRANKSHAFT INSPECTION AND REPAIR REQUIREMENTS. Carefully in- spect for misalignment and replace if bent be- yond the manufacturer’s permissible service limit. Worn journals may be repaired by re- grinding in accordance with manufacturers’ in- structions. It is recommended that grinding operations be performed by appropriately-rated repair stations or the original engine manufac- turer. Common errors that occur in crankshaft grinding are the removal of nitrided journal surface, improper journal radii, unsatisfactory surfaces, and grinding tool marks on the jour- nals. If the fillets are altered, do not reduce their radii. Polish the reworked surfaces to as- sure removal of all tool marks. Most opposed engines have nitrided crankshafts, and engine manufacturers specify that these crankshafts must be re-nitrided after grinding. NOTE: Rapid deceleration or mo- mentary slowing of a propeller may occur due to contact with tall grass, water, or snow. If this occurs, the en- gine and propeller should be inspected in accordance with the manufac- turer’s instruction or service bulletins. 8-4. REPLACEMENT PARTS IN CER- TIFICATED ENGINES. Engine replacement parts must be approved under Title 14 of the Code of Federal Regulations (14 CFR), part 21. Serviceable parts obtained from the engine manufacturer, authorized service facil- ity, and those which are approved Federal Aviation Administration (FAA)/Parts Manu- facture Approval (PMA), or Technical Stan- dard Order (TSO), and meet the requirements of part 21 are acceptable for use as replace- ment parts. Used engine parts can be installed Par 8-2 Page 8-3PDF Image | AFS-640
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