GTS Mod 4 Easy
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Questions and Answers

When does the speed sensitive valve reposition to open the port for directing 14th stage air onto the bleed air valve piston heads?

  • Above 94% RPM (correct)
  • At 5th stage pressure
  • Below 94% RPM
  • At 10th stage pressure
  • Why are the compressor bleed air valves forced closed when the engine is running above 94% RPM?

  • Due to lower speed of compressor
  • Due to increased air pressure in the 14th stage (correct)
  • Due to decreased air pressure in the 5th stage
  • Due to weight of valve flyweights
  • What is the purpose of the compressor bleed surge control system during low speed operations?

  • To reduce turbine power
  • To decrease air flow to the rear compressor
  • To increase engine RPM
  • To relieve excess air from the engine (correct)
  • What happens to the windmilling load of the front compressor when engine cranking begins?

    <p>It decreases (C)</p> Signup and view all the answers

    Which turbines drive the front compressor when the engine starts?

    <p>Second, third, and fourth stage turbines (B)</p> Signup and view all the answers

    What happens to the compressor bleed air valves when the engine is running below 94% RPM?

    <p>They open (C)</p> Signup and view all the answers

    What component consists of four pneumatically operated bleed valves located on the compressor fifth stage?

    <p>Bleed valve system (C)</p> Signup and view all the answers

    When is the speed sensing valve positioned to stop 14th stage air acting on the 5th and 10th stage bleed valves?

    <p>Below 94% RPM (A)</p> Signup and view all the answers

    What happens when the speed sensing valve is positioned to stop 14th stage air acting on the 5th and 10th stage bleed valves?

    <p>The bleed valves open (D)</p> Signup and view all the answers

    Which component responds to engine RPM in the compressor bleed valve system?

    <p>Speed sensitive valve (D)</p> Signup and view all the answers

    In the compressor bleed valve system, what ducts excess air overboard when the bleed air valves are open?

    <p>Bleed air valves (C)</p> Signup and view all the answers

    What causes the compressor air to force open the 5th and 10th stage bleed valves?

    <p>Speed sensing valve operation (D)</p> Signup and view all the answers

    What function does the compressor bleed valve system serve during engine start and up to 13,000 RPM?

    <p>Unloads the compressor (B)</p> Signup and view all the answers

    At what engine speed does the Allison T56 engine operate at low speed ground idle?

    <p>69% to 75% (D)</p> Signup and view all the answers

    What controls the opening of the compressor bleed valves during low speed ground idle or engine shutdown?

    <p>Speed sensitive valve (C)</p> Signup and view all the answers

    What happens when the operator selects the function to reduce engine speed for fuel saving and noise reduction during ground operations?

    <p>RPM is governed between 69% to 75% (A)</p> Signup and view all the answers

    How does the bleed band slacken to uncover the compressor bleed ports?

    <p>P3 air opposes spring tension (C)</p> Signup and view all the answers

    Which stages of the compressor are bled by the compressor bleed valve system?

    <p>Fifth and tenth stages (C)</p> Signup and view all the answers

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