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Engine Exhaust
O&P(P)
| Question | Answer |
|---|---|
| How does a leak appear in an engine exhaust system ? | It normally looks like a gray or black feather-shaped streak coming from a crack or from a location where components are not in perfect alignment |
| How can you check a recip engine exhaust system for leaks? | Pressurize the exhaust system with the discharge from a vacuum cleaner and wipe a soap solution over all joints and suspect areas. A leak will cause bubbles to form |
| How do the components in the exhaust system of a turbocharged engine allow for expansion and contract due to heat, and at the same time prevent leakage? | Bellows and ball joints prevent leakage while allowing contraction and expansion |
| Should a turbocharged engine be started with the wastegate open or closed? | OPEN, so as much exhaust as possible will bypass the turbine |
| What is the primary function of a recip engine exhaust system? | Its main function is to dispose of the gases with complete safety to the airframe and the occupants of the aircraft. The exhaust system can perform many useful functions, but its first duty is to provide protection against the potertially destructive acti |
| What is a short stack exhaust system ? | The short stack exhaust system utilizes open exhaust tubes with no mufflers. The short stack system is generally used on non-supercharged engines and low-powered engines where the noise level is not too objectionable |
| How is exhaust flow different in a ducted fan turbine engine verses an unducted fain engine | Ducted fan engines take the fan airflow and direct it through closed ducts along the engine. Then, it flows into a common exhaust nozzle. The core exhaust flow and the fan flow mix and flow from the engine through this mixed nozzle. The unducted fan has t |
| What is the purpose of an augmentor on a recip engine exhaust system | The augmentors are designed to produce a venturi effect to draw an increased airflow over the engine to augment engine cooling |
| How dies a recip engine muffler decrease engine noise | Exhaust gases from the cylinders are combined into a common manifold that contains a section of the exhaust where the volume increases (expansion chamber), slowing the gases down, diffusing the flow through internal baffles, and reducing the noise |
| What is a jet aircraft hush kit | A hush kit is an aerodynamic device that defuses the flow of exhaust from older turbojet engines, by reducing the noise caused by high-velocity jet exhaust |
| Why are thrust reversers not normally used when the airplane is moving below approximately 60 knots | There is a danger of recirculating the exhaust gases and of the engine ingesting foreign objects stirred up by the high velocity gases |
| What is a mechanical blockage thrust reversers | A thrust reverser that slides a pair of scoop shaped doors aft and opens them so they block the rearward flow of gases and deflect the gases forward |
| How does a cascade type thrust reverser operate | A portion of the fan cowl moves rearward, and a series of blocker doors deflect the fan discharge air through fan cascades that direct the discharge air forward. At the same time, blocker doors shut off the flow of gases from the core engine and deflect i |
Created by:
tbarth
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