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Related Flashcards
Cards In This Set
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1. What is the purpose of a bleed air system?
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1. To operate or control pneumatic systems or components.
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2. What are three sources of bleed air used to operate systems on jet aircraft?
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2. Aircraft engine(s); ground air cart; and GTCs, GTUs, or APUs.
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3. List the components of a bleed air system.
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3. Check valves, shutoff valves, wing isolation or body crossover valves, flow control valves, pressure- regulating valves, bleed air ducting, and the necessary controls.
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4. What is the purpose of a ground-air connection check valve?
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4. Prevents bleed air from escaping the system.
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1. What happens to the system shutoff valve if power to the solenoid is deenergized by opening the control switch?
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1. The plunger is moved to the right by the return spring and since the ball check valve shifts as necessary, air flows through either tap-off line, through the ball check valve and into the control valve. Bleed air then flows through the right-hand chamber of the actuator. This air pressure moves the piston to the left, closing the butterfly valve.
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2. Why is velocity, or airflow, greatest at the venturi throat?
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2. So that the same amount of air can pass through the narrow throat because when air leaves the throat it slows to its original velocity.
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3. What function does a pressure limiter serve in a bleed air system?
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3. To protect downstream components from excessive pressure.
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4. What factors maintain a constant pressure in a flow control valve?
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4. Inlet temperature and pressure.
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 5. What happens when the manual override (H) in figure 1–12 moves to the OPEN position? |
 5. The poppet valve (G), in figure 1–12, unseats. |
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1. What material(s) are usually used for high-pressure/high-temperature ducting?
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1. Stainless steel.
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2. To ensure a good airtight seal when installing a V-band clamp, what action should you take?
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2. Tap the clamp with a rawhide or plastic-faced mallet.
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3. Why should you install the bottom bolts on a bolted flange duct first?
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3. To cradle or support the gasket in place so the remaining bolts can be installed.
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4. What type lubricant can only be used on beaded duct sleeves to aid installation?
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4. Water.
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5. List three components that are used to compensate for thermal expansion.
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5. Any three of the following: expansion joints (bellows), thermal compensators, universal joints, loops, horseshoe bends, and offsets.
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1. What must you do first to perform an operational check of the bleed air system?
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1. Turn on the electrical system, place the control switches in the open or closed position to check.
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