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9/8/98 AC 43.13-1B CHAPTER 8. ENGINES, FUEL, EXHAUST, AND PROPELLERS SECTION 1. ENGINES 8-1. GENERAL. Consult the manufac- turer’s manuals, service bulletins, and instruc- tion books regarding the repair and overhaul, inspection, installation, and maintenance of aircraft engines, for that particular make, model, and type of engine. This section lists acceptable inspection and repair procedures that may be used in the absence of an engine manufacturer’s maintenance information. 8-2. SPECIAL INSPECTION. A visual inspection is needed to determine the condition of the engine and its components. An annual or 100-hour inspection should include the en- gine and nacelle group as follows. a. Cold Cylinder Check. If an engine is running rough the cause may be a bad ignition lead, a spark plug not firing, a partially clogged fuel injector, or a bad magneto. The dead cyl- inder will be colder than the surrounding cyl- inders and can be quickly determined by using the recommended cold cylinder checks. This should be done using a thermocouple probe which is very sensitive to small differences in temperature, which is the case with a partially- clogged injector. For a carbureted engine, the following check may be helpful: (1) Using experienced personnel, run the engine on the bad magneto for approxi- mately 30 seconds at 1200 rpm. Without switching the magneto switch back to both shut off the engine. Have another mechanic use a grease pencil (non-carbon), and quickly mark each exhaust stack approximately 1 inch from the flange that holds the exhaust stack to the cylinder. Next, check the exhaust stacks and look for the exhaust stack whose grease pencil mark has not turned to a grayish-white or ash color. This is the cold cylinder. (2) The probable cause of the cold cyl- inder is either a defective spark plug or igni- tion lead. Switch spark plugs to another cylin- der and run the test again. If the problem stays with the original cylinder, the problem is either the ignition lead or the magneto. b. Piston Engine Sudden Stoppage In- spection. Sudden stoppage is a very rapid and complete stoppage of the engine. It can be caused by engine seizure or by one or more of the propeller blades striking an object in such a way that rpm goes to zero in less than one complete revolution of the propeller. Sudden stoppage can cause internal damage to con- stant-speed propellers; reduction drive; gear train damage in the accessory section; crank- shaft misalignment; or damage to accessories such as magnetos, generators, vacuum pumps, and tach generators. (1) Every engine that suffers a sudden stoppage must be inspected in accordance with the manufacturer’s maintenance instructions before being returned to service. (2) If the engine manufacturer does not provide the required information, then the en- gine case must be opened and every major component part must be inspected using visual and/or nondestructive inspection (NDI) proce- dures as applicable. (3) The sudden-stoppage inspections include: checking for cowling, spinner, and airframe cracks and hidden damage; and alignment of the engine mount to the airframe, Par 8-1 Page 8-1PDF Image | AFS-640
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