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8 Cards in this Set
- Front
- Back
- 3rd side (hint)
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How does a leak appear in an engine exhaust system? |
Looks like a gray or black feather-shaped streak coming from a crack or from a location where components are not in perfect alignment. |
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How can you check an exhaust system for leaks? |
Pressurize the exhaust system with the discharge from a vacuum cleaner and wipe a soap solution over all joints and suspected areas. A leak will cause bubbles to form. |
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How do components in the exhaust system of a turbocharged engine allow for expansion and contraction due to heat, and at the same time prevent leakage? |
Bellows and ball joints prevent leakage while allowing contraction and expansion. |
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What type of damage is most common in an exhaust system of a reciprocating engine? |
Cracks caused by expansion and contraction. |
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Should a turbocharged engine be started with the waste gate open or closed? |
Open, so as much exhaust as possible will bypass the turbine. |
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Why are thrust reversers not normally used when the airplane is moving below approximately 60 knots? |
Poses a Danger of recirculating the exhaust gases and the engine ingesting the foreign objects stirred up by the high velocity gases. |
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What is a mechanical-blockade thrust reverser? |
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 in the reverse direction. |
The engine exhaust gases are mechanically blocked and diverted at a suitable angle in the reverse direction by an inverted cone, half-sphere, or clam shell. This is placed in position to reverse the flow of exhaust gases. |
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How does a Dynamic or Cascade-type thrust reverser operate? |
A portion of the fan cowl moves rearward. A series of blocker doors deflect the fan discharge air through fan Cascade vanes that directs the discharge air in the reverse direction. The blocker doors shuts off the flow of gases from the engine and deflects it through the Cascades that direct it in the reverse direction. |
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