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Assignment 5-8-3

Fuel Systems Review

QuestionAnswer
1. The tendency of a fuel to vaporize refers to its _____________. Volatility
2. Define flashpoint The minimum temperature at which combustible liquid emits a sufficient quality of vapor that ignition will occur during a momentary application of a flame?
3. What type of fuel is used during shipboard operations? Why? JP5, less volatile, higher flash point.
4. an increase in temperature will cause what change, if any, in volatility? In flashpoint? Increase the volatility, Flashpoint always remains constant.
5. What are the major considerations in designing a fuel system? 1. Operation at low atmospheric pressers. 2. Complexity of the piping system. 3. Cold weather. 4. High fuel flow pressure
6. What controls the amount of fuel delivered to the combustion section? Exhaust Section? The FCU. The Afterburning FCU.
7. How does the pilot communicate with the Fuel Control Unit FCU)? Through the PCL
8. List the various operational parameters the FCU must process to deliver the proper flow to the engine 1. PCL inputs. 2. Compressor inlet temperature. 3. Compressor rpm (high-pressure RPM in dual spool). 4. Turbine inlet temperature.
9. Describe the emergency/manual fuel system? Pilot controls amount of fuel supplied to the burner and the rate of application. Pilot must monitor the engine's critical limits.
10. Why is a boost pump include in the aircraft system? To avoid vapor lock or engine fuel pump cavitation.
11. What part does the FCU play during engine starts? Sends pressure signal to close the dump valve at engine start.
12. What is the position of the pressurizing and damp valve during engine start? During normal engine operation? During engine shutdown? 1. Both valves closed. 2. dump valves closed ad pressurizing valve open. 3. Dump valve open and pressurizing valve closed.
13. What cuts off fuel flow during engine shutdown? The FCU
14. Where does metered begin tin the aircraft fuel system? After the FCU
15. What is military rated thrust? The maximum thrust for a specified limited period of time (30 minutes)
16. What component measures the proper amount of fuel flow to the afterburner? Afterburner fuel control unit
Created by: Rudyrm
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