By John Cox, special for USA TODAY question: is - this sound in the Airbus (you hear) just after the push-back and just after landing? This looks like an Airgun used for take-off tires in NASCAR. I guess it is a sort of pressurizing or hydraulic locking door luggage. -presented by reader jaysku response: is transfer of hydraulic power unit (PTU). This device allows an independent hydraulic system provide energy to another. It activates when a low pressure condition is detected in one of the systems. When an engine is executed, it has a hydraulic system with no pressure pump engine, causing the PTU activate. This is most common at the door when an engine is closed and another continues to run until the power to the ground is provided. It has been described to me as survey as a dog bark, but is also your analogy with a pistol of NASCAR tires. Q: Commercial plans just below of the tail, it resembles an exhaust port. What is this for? -fourtyacres A: it is usually the exhaust for auxiliary power (APU) unit. The APU is a small turbine provides power and air for air conditioning system when normal sources, engines, do not run. In addition, many aircraft engines are started with compressed air supplied by the APU. If an electric generator fails, the APU can provide a backup power source. Q: I have a question about the APU: when and how are they used in the current market conditions? I know that the availability of the power to the ground can sometimes allow the crew to avoid starting the APU, but is still needed for things like starting engines? Recently, I was on a flight and that we've rolled after landing, flight attendants asked us to lower our shades to help preserve the cold of the cabin. This was an attempt to avoid using APU? I know that the least amount of fuel burned, better it will be a business point of view. -drhunterr A: as that gasoline prices went, use of the APU has decreased. Rather than use the APU to provide cooling air and electricity at the door, many airlines now use air conditioning of soil and ground power. The cost of execution of the APU is decreased and fuel is saved, which is obviously better for the company. On many aircraft line engines are started with the help of compressed air to turn the starter. Usually this is done with the APU air, but it can also be a cart air field. Lower grades help keep cold cabin, allowing the air conditioning on the ground to regulate the temperature in the cabin. Readers, please leave your questions for John Cox here and leave only the comments on column this week below. Read previous columnsJohn Cox is a retired with US Airways airline captain and runs his own consulting business, operating safety Systems.Guidelines aviation security: If you share in the community today to the United States, please keep your comments smart and civil. Don't attack other readers personally and keep your decent language. Use the "Report abuse" button to make a difference. Read more.
Monday, December 13, 2010
The captain to ask: what is - this sound like an Airgun NASCAR? (USA TODAY)
By John Cox, special for USA TODAY question: is - this sound in the Airbus (you hear) just after the push-back and just after landing? This looks like an Airgun used for take-off tires in NASCAR. I guess it is a sort of pressurizing or hydraulic locking door luggage. -presented by reader jaysku response: is transfer of hydraulic power unit (PTU). This device allows an independent hydraulic system provide energy to another. It activates when a low pressure condition is detected in one of the systems. When an engine is executed, it has a hydraulic system with no pressure pump engine, causing the PTU activate. This is most common at the door when an engine is closed and another continues to run until the power to the ground is provided. It has been described to me as survey as a dog bark, but is also your analogy with a pistol of NASCAR tires. Q: Commercial plans just below of the tail, it resembles an exhaust port. What is this for? -fourtyacres A: it is usually the exhaust for auxiliary power (APU) unit. The APU is a small turbine provides power and air for air conditioning system when normal sources, engines, do not run. In addition, many aircraft engines are started with compressed air supplied by the APU. If an electric generator fails, the APU can provide a backup power source. Q: I have a question about the APU: when and how are they used in the current market conditions? I know that the availability of the power to the ground can sometimes allow the crew to avoid starting the APU, but is still needed for things like starting engines? Recently, I was on a flight and that we've rolled after landing, flight attendants asked us to lower our shades to help preserve the cold of the cabin. This was an attempt to avoid using APU? I know that the least amount of fuel burned, better it will be a business point of view. -drhunterr A: as that gasoline prices went, use of the APU has decreased. Rather than use the APU to provide cooling air and electricity at the door, many airlines now use air conditioning of soil and ground power. The cost of execution of the APU is decreased and fuel is saved, which is obviously better for the company. On many aircraft line engines are started with the help of compressed air to turn the starter. Usually this is done with the APU air, but it can also be a cart air field. Lower grades help keep cold cabin, allowing the air conditioning on the ground to regulate the temperature in the cabin. Readers, please leave your questions for John Cox here and leave only the comments on column this week below. Read previous columnsJohn Cox is a retired with US Airways airline captain and runs his own consulting business, operating safety Systems.Guidelines aviation security: If you share in the community today to the United States, please keep your comments smart and civil. Don't attack other readers personally and keep your decent language. Use the "Report abuse" button to make a difference. Read more.
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