Podcast
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?
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?
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?
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?
What happens to the windmilling load of the front compressor when engine cranking begins?
Which turbines drive the front compressor when the engine starts?
Which turbines drive the front compressor when the engine starts?
What happens to the compressor bleed air valves when the engine is running below 94% RPM?
What happens to the compressor bleed air valves when the engine is running below 94% RPM?
What component consists of four pneumatically operated bleed valves located on the compressor fifth stage?
What component consists of four pneumatically operated bleed valves located on the compressor fifth stage?
When is the speed sensing valve positioned to stop 14th stage air acting on the 5th and 10th stage bleed valves?
When is the speed sensing valve positioned to stop 14th stage air acting on the 5th and 10th stage bleed valves?
What happens when the speed sensing valve is positioned to stop 14th stage air acting on the 5th and 10th stage bleed valves?
What happens when the speed sensing valve is positioned to stop 14th stage air acting on the 5th and 10th stage bleed valves?
Which component responds to engine RPM in the compressor bleed valve system?
Which component responds to engine RPM in the compressor bleed valve system?
In the compressor bleed valve system, what ducts excess air overboard when the bleed air valves are open?
In the compressor bleed valve system, what ducts excess air overboard when the bleed air valves are open?
What causes the compressor air to force open the 5th and 10th stage bleed valves?
What causes the compressor air to force open the 5th and 10th stage bleed valves?
What function does the compressor bleed valve system serve during engine start and up to 13,000 RPM?
What function does the compressor bleed valve system serve during engine start and up to 13,000 RPM?
At what engine speed does the Allison T56 engine operate at low speed ground idle?
At what engine speed does the Allison T56 engine operate at low speed ground idle?
What controls the opening of the compressor bleed valves during low speed ground idle or engine shutdown?
What controls the opening of the compressor bleed valves during low speed ground idle or engine shutdown?
What happens when the operator selects the function to reduce engine speed for fuel saving and noise reduction during ground operations?
What happens when the operator selects the function to reduce engine speed for fuel saving and noise reduction during ground operations?
How does the bleed band slacken to uncover the compressor bleed ports?
How does the bleed band slacken to uncover the compressor bleed ports?
Which stages of the compressor are bled by the compressor bleed valve system?
Which stages of the compressor are bled by the compressor bleed valve system?
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