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AC 43.13-1B 9/8/98 the mounting hardware, isolation mounts, and bushings. The aircraft’s firewall must also be checked for distortion, cracks, and elongated bolt holes. The damaged propeller must be sent to an FAA-certificated repair station for complete NDI and repair. (4) Engine accessories such as: magne- tos, starters, fuel pumps, turbochargers, alter- nators, or generators must be inspected in ac- cordance with the manufacturer’s maintenance manual on sudden stoppage or overhaul proce- dures to determine the product’s airworthiness. c. Reciprocating Engine (Direct Drive). Preliminary inspection before tear down. (1) Remove the engine cowling and ex- amine the engine for visible external damage and audible internal damage. (2) Rotate the propeller shaft to deter- mine any evidence of abnormal grinding or rubbing sounds. (3) With the propeller removed, inspect the crankshaft flange or splines for signs of twisting, cracks, or other deformation. Re- move the thrust-bearing nut and seal and thor- oughly inspect the threaded area of the shaft for evidence of cracks. (4) Rotate the shaft slowly in 90-degree increments while using a dial indicator or an equivalent instrument to check the concentric- ity of the shaft. (5) Remove the oil sump drain plug and check for metal chips and foreign material. (6) Remove the oil screens and inspect for metal particles and contamination. (7) Visually inspect engine case exterior for signs of oil leaks and cracks. Give particular attention to the propeller thrust- bearing area of the nose case section. (8) Inspect cylinders and cylinder hold- down area for cracks and oil leaks. Thor- oughly investigate any indication of cracks, oil leaks, or other damage. d. Internal Inspection Requirements. (1) On engines equipped with crank- shaft vibration dampers, remove and inspect the cylinders, and inspect the crankshaft damp- ers in accordance with the engine manufac- turer’s inspection and overhaul manual. When engine design permits, remove the damper pins, and examine the pins and damper liners for signs of nicks or brinelling. (2) After removing the engine-driven accessories, remove the accessory drive case and examine the accessory and supercharger drive gear train, couplings, and drive case for evidence of damage. (a) Check for cracks in the case in the area of accessory mount pads and gear shaft bosses. (b) Check the gear train for signs of cracked, broken, or brinelled teeth. (c) Check the accessory drive shaft couplings for twisted splines, misalignment, and run-out. (d) Check connecting rods for cracks and straightness. e. Reciprocating Engine (Gear-Drive). Inspect the engine, propeller, (refer to section 4 on propeller inspection), and components as described in the preceding paragraphs. (1) Remove the propeller reduction gear housing and inspect for: Page 8-2 Par 8-2PDF Image | AFS-640
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