Powered Flight Control Unit (Pfcu)

In: Other Topics

Submitted By AzrinRashid
Words 3655
Pages 15
GENERAL PRINCIPAL When aircraft are flying at high speed, the aerodynamic forces acting on the control surface are such that it is not possible to move the surfaces without some form of assistance. This assistance can be provided in the form of hydraulic or electric power or a combination of both of the systems. This system is important for the aircraft to fly.
. The purpose of the powered flight control unit fitted on the aircraft is to: 1) Aircraft speed and aerodynamic loads imposed on control surface too great for the pilot to overcome using manual force only. 2) Assist the pilot to overcome this load 3) No need for normal form of aerodynamic assistance, example: balance tab and spring balance tab

EXPLAINATION OF POWERED FLIGHT CONTROL UNIT (PFCU)

Figure 1: Powered Flight Control Unit System Drawing
Artificial Feel
With purely mechanical flight control systems, the aerodynamic forces on the control surfaces are transmitted through the mechanisms and are felt directly by the pilot, allowing tactile feedback of airspeed. With hydro mechanical flight control systems, however, the load on the surfaces cannot be felt and there is a risk of overstressing the aircraft through excessive control surface movement. To overcome this problem, artificial feel systems can be used.
With total hydraulic or electric power moving the control surface, it becomes difficult for the pilot to gauge the amount of control movement required for any maneuver. This is because the pilot's control does not have any sensation of the aerodynamic loads on the control surface. To avoid overstressing the aircraft it is necessary to re-introduce, artificially, this sense of actually moving the control surface, in other words, to provide Artificial Feel.
Fully powered aircraft normally will have no feel of the aerodynamic load. Pilot can’t instinctively position the control…...

Similar Documents

Unit 3 It255 Access Control

... 6. Remote access control procedures must provide adequate safeguards through robust identification, authentication and encryption techniques. 7. Carefully consider the wisdom of providing cellular telephones and modems for use with laptop computers. This technology isn’t usually justified considering the relatively modest increase in productivity compared to the cost and the security risk of a lost laptop. 8. Consider using only the NetBEUI protocol for remote access to limit the extent of intrusions on the network. 9. Control the distribution of remote access software on the network. Never allow client computers to run remote control software. If remote control software is necessary, run the software from centrally controlled computers or thin-client servers. 10. Disable dial-in networking, except in the cases of trusted individuals or to special computers,because dial-in networking can bypass regular network security. 11. Encourage an easy-to-use (but secure, of course) method for users to indicate when they need remote access, for how long, and to which phone number. Base the dial-in permissions on these requests. Always verify the request verbally with the user to ensure that it’s not a spoof. 12. Gather contact information for the telephone companies as soon as possible so that it is on hand if dial -up hacking attempts are discovered. 13. If possible, use external modems to answer RAS connections. They can be powered off when no RAS......

Words: 609 - Pages: 3

Nt2580 Unit 3 Access Control Models

...Scenario 1: (DAC) Discretionary Access Control. Being that the business is small and not in need of higher security measures, it would be the easiest to maintain and monitor for a small business. Scenario 2: (MAC) Mandatory Access Control. The employees primarily communicate using smartphones; which proves as a possible security risk. MAC is stronger than DAC but, still easily monitored for a small business; which makes this the top choice for Top Ads. Scenario 3: (RBAC) Role Based Access Control. With the company being as large as it is and the employees traveling and/or working from home, the roles set by a Security Administrator would be the most secure and efficient way of providing different levels of clearance to individual users. It would take time to start from nothing but, once the security measures are in place it would be easy to monitor and to manage. Scenario 4: Content-Dependent Access Control. Since everything that the company does depends on the individual material being manufactured the above Access Control type should be apparent. Giving permissions by what is contained in each individual file is more costly but, a lot more secure. It also allows the company to monitor the data sent less as each document is given its own set of roles. Scenario 5: (RBAC) Role Based Access Control. With RBAC in place the security measures would be assigned to each user and monitored by the security administrator(s). Using this Access control method would allow for......

Words: 288 - Pages: 2

Flight

...4 Aviation accidents and incidents 5 Air traffic control 6 Environmental impact 7 See also 8 Notes History Main article: History of aviation Many cultures have built devices that travel through the air, from the earliest projectiles such as stones and spears,[2][3] the boomerang in Australia, the hot air Kongming lantern, and kites. There are early legends of human flight such as the story of Icarus, and Jamshid in Persian myth, and later, somewhat more credible claims of short-distance human flights appear, such as the flying automaton of Archytas of Tarentum (428–347 BC),[4] the winged flights of Abbas Ibn Firnas (810–887), Eilmer of Malmesbury (11th century), and the hot-air Passarola of Bartolomeu Lourenço de Gusmão (1685–1724). The modern age of aviation began with the first untethered human lighter-than-air flight on November 21, 1783, in a hot air balloon designed by the Montgolfier brothers. The practicality of balloons was limited because they could only travel downwind. It was immediately recognized that a steerable, or dirigible, balloon was required. Jean-Pierre Blanchard flew the first human-powered dirigible in 1784 and crossed the English Channel in one in 1785. In 1799 Sir George Cayley set forth the concept of the modern airplane as a fixed-wing flying machine with separate systems for lift, propulsion, and control.[5][6] Early dirigible developments included machine-powered propulsion (Henri Giffard, 1852), rigid frames......

Words: 2488 - Pages: 10

Power Control Unit, Hydraulic

...Power Control Unit, Hydraulic - Description Hydraulic power control units (typically referred to as PCUs) are used to position primary (or secondary) flight control surfaces. PCUs are a single assembly (i.e., single part number) that combines individual hydraulic components into an assembly. PCUs perform two critical functions: (1) they position the flight control surface in response to mechanical or electrical commands, and (2) they represent a principle structural element capable of withstanding flight loads and providing protection against flutter (unsteady, aerodynamic loads). The requirements of these two functions make PCU design a challenging task. At the heart of PCU is a servovalve and an actuator (servo actuator). The servovalve can be controlled by a flapper nozzle, jet pipe, solenoid, torque motor or mechanical linkage. Some PCUs contain only a servo actuator. However, PCUs often contain other components to meet performance and failure mode performance criteria. Other components typically found in PCUs are shutoff valves, pressure relief valves, input filter, check valves, and compensator. Another component that is often part of a PCU is one or more servos whose control is based on some performance criteria. These servos can be positioned electronically or by hydraulic pressure (where loss of hydraulic pressure allows a spring to position the servo). A simple PCU is shown in Figure 1. Figure 1 Simple PCU Diagram This PCU shows the pressure input going......

Words: 2620 - Pages: 11

A320 Flight Control

...AlRBL"S TR.\INING FLIGHT CONTROLS MANUAL 1.27.00 SEQ 001 P 1 ~S~O~~T~R FLIGHT CREW OPERATING CONTENTS I REV 36 27.00 27.10 CONTENTS DESCRIPTION - GENERAL - ARCHITECTURE NORMAL LAW GENERAL PITCH CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 LATERAL CONTROL LOAD ALLEVIATION FUNCTION (A320 ONLY) 7 SIDESLIP TARGET RECONFIGURATION CONTROL LAWS GENERAL FLIGHT CONTROLS LAW RECONFIGURATION ALTERNATE LAW ALTERNATE LAW WITHOUT REDUCED PROTECTION DIRECT LAW ABNORMAL ATTITUDE LAWS MECHANICAL BACKUP CONTROLS AND INDICATORS PEDESTAL LATERAL CONSOLES GLARESHIELD OVERHEAD PANEL SIDESTICK INDICATIONS ON PFD ECAM F/CTL PAGE ECAM WHEEL PAGE WARNINGS AND CAUTIONS - MEMO DISPLAY FLAPS AND SLATS - DESCRIPTION - CONTROLS AND INDICATORS - WARNINGS AND CAUTIONS 1 5 8 1 1 3 4 5 8 9 11 12 14 1 5 1 6 8 1 2 3 6 6 7 7 27.20 27.30 27.40 R 27.50 27.60 ELECTRICAL SUPPLY SIMU F.P.S.3 UP for training only STD 1.3.1 AlRBL"S TR.\INING FLIGHT CONTROLS MANUAL 1.27.10 SEQ 001 P 1 ~S~O~~T~R FLIGHT CREW OPERATING DESCRIPTION I REV 34 I GENERAL I The fly-by-wire system was designed and certified to render the new generation of aircraft even more safe, cost effective, and pleasant to fly. BASIC PRINCIPLE Flight control surfaces are all : - Electrically-controlled, and - Hydraulically-activated. The stabilizer and rudder can also be mechanically-controlled. Pilots use sidesticks to fly the......

Words: 6391 - Pages: 26

Flight

...Doris Lessing’s "Flight" is a short story revolving around an old man and his learning of accepting in life. The author, however, does not let her readers know much about the old man, especially in the sphere of physical appearance. Even his name is not known to the readers. Doris Lessing, alternatively, aims to steer her readers to centre on the old man’s inner feelings, i.e. his weird mood and his consequent eccentric behaviors. A close and careful analysis is essential for us to somehow get a reasonable explanation about his eccentricities. The old man keeps pigeons and considers the dovecote his refuge. These little birds are seemingly his only pleasure in life, for all of his three grand daughters have gone with their husbands, leaving him with his daughter Lucy and the young Alice. Because Alice is the last grand daughter to stay with him, and because she is going to get married, he feels possessive towards her. Never does he want her to leave as do her sisters. He always wants to keep her, to have control on her, and to never let her leave, for fear that she will never come back to him, like the way he prevents his favorite pigeon from flying back to the sky. He keeps on considering Alice as still a child and on objecting her courtship with Steven the postmaster’s son. This possessive and somewhat selfish attitude has led to his unconventional behaviors. Miserably and angrily he shouts at her, asking her old-fashioned phrases stating his objection to her future......

Words: 628 - Pages: 3

Unit 3. Access Controls

...NT2580 Unit 3 Access Controls 01/22/2014 1. For the construction company scenario the data would probably consist of customer contact information, accounting, and inventory. For administrative controls I would administer a password policy. For the logical/technical controls I would have passwords checked and enforced. For the software controls I would make sure that updates are checked regularly. 2. For the advertising company scenario the data would probably consist of customer contact information, accounting, and inventory. For administrative controls I would administer a password policy. For the logical/technical controls I would have passwords checked and enforced. For the software controls I would make sure that updates are checked regularly. 3. For NetSecIT, I would implement all access controls on this organization because of the size of the company and the remote access. For administrative controls I would administer a password policy. For the logical/technical controls I would have passwords checked and enforced. For the software controls I would make sure that updates are checked regularly. For the hardware controls I would utilize MAC filtering and smart card use. For the physical I would utilize security guards and ID badges. 4. For Backordered Parts, I would implement all access controls for this organization because it is a defense contractor that builds communications parts for the military. For administrative controls I would administer......

Words: 362 - Pages: 2

Control Unit Prisons

...V.Diaz CJC 141 Mr. Wilson 27 Mar 2014 Control Unit Prisons Built to house the “worst of the worst” control units and control unit prisons have exploded throughout the system as a means to house, monitor, and control the most violent, rebellious, and unmanageable of prisoners within the system. Or do they? The article “From Alcatraz to Marion to Florence: Control Unit Prisons in the U.S.” paints a striking picture that reveals many of the inhumane practices used in these prisons, which are more often than not used on individuals who are far from the “worst” and also illustrates the bending, reclassification, and creation of rules that make it possible to do so. According to the article prisoners at Marion, Pelican Bay, Lebanon and similar facilities spend as little as an hour outside of their tiny cells (From Alcatraz to Marion to Florence) for exercise, recreation, and shower and then spend the rest of their day in total isolation without any meaningful human contact, often in a completely dark and air deprived cell with a solid steel door and without windows (From Alcatraz to Marion to Florence). What seems incredible is that any attempt at rehabilitation has been replaced with what almost amounts to “torture” practices. Some of these inmates will one day walk amongst us in society and the levels of mental abuse that they have been subjected to will definitely come back to haunt us. It is a known...

Words: 754 - Pages: 4

Flight

...expensive to rent planes. So, I’m saving up for my own Cessna 120 for almost two years now but it’s feels like ten years” (Palmer). However, the history of flight goes back more than a century. “From the earliest times, the desire to fly has been a powerful urge. Although people could walk, swim, or travel by ship or carriage, for centuries they were frustrated by inability to emulate birds” (Mondey). That urge cost people their lives as many made attempts to fly, but most failed. However they all had the same idea of birds being the key. “People strapped themselves to wings and jumped off cliffs and other simply watched the birds fly as they took notes. Some studied the feathers from birds and theorized that feathers glided light enough to defy gravity, and others just deemed flight far too dangerous to even attempt” (Prewitt). Stephen Mathew, a plane engineer now attending Sac State for his BA, notified, “Most people got mislead that birds fly by moving their wings downward and backward in a rowing motion rather than an up and down motion as we know today. That’s probably one of the reasons why the invention of flight took so long as it did.” In the book “Flight”, H. Stever points out that the final blueprint of a plane takes into consideration the four basic essentials of flight: aerodynamics, propulsion, structure, and control. Those principles incorporated enable airplanes to overcome the force of gravity and therefore fly. (53) Aerodynamics, which consist of four......

Words: 2369 - Pages: 10

Unit 3 Discussion 1: Access Control Models

...access. Discretionary Access Controls should be used in this scenario because the company is small and not in need of high security environment. This solution is the simplest to maintain and monitor for a small business. 2. Top Ads is a small advertising company consisting of 12 computers that have internet access. All employees communicate using smart phones. Mandatory Access Controls should be used in this scenario because the employees primarily communicate using smart phones, which opens up a security risk. Mandatory Access Controls are a step up stronger than Discretionary Access Controls, but are still relatively simple to monitor for a small business. 3. NetSecIT is a multinational IT services company consisting of 120,000 computers that have internet access and 45,000 servers. All employees communicate using smart phones and e-mail. Many employees work from home and travel extensively. Role Based Access Control should be used in this scenario because this is a large company with employees who travel and work from home. The roles should be controlled by a Security Administrator who could provide different levels of security to individual users. There would be some overhead in startup to get up and running but once in place this should be easy to manage. 4. Backordered Parts is a defense contractor that builds communication parts for the military. All employees communicate using smart phones and e-mail. Content-Dependent Access Controls should be used in this......

Words: 407 - Pages: 2

Unit 2 Lab 2: Self - Control

...Jaime H. Cabigtnig Unit 2 Lab 2: Self - Control TEMPTATION |WHAT WILL I DO IF I YIELD TO TEMPTATION?|WHAT WILL I DO IF I BEHAVE HOW I WANT MYSELF TO BEHAVE?| Leaving work earlier|I will not make the money that Is owed to me|Know that the extra money will benefit my family| Cursing|Donate $2 to charity|Reward myself with a positive word for today| Lying|Defame my character to my boss or co-workers|I will develop a good reputation of dependability with my co-workers | Quick to anger|Alienate people and their ideas and possible resolutions|I will encourage an atmosphere of understanding and cohesion which is a good quality when trying to move up the ladder professionally| Eating fast food|Waste money and gain weight|Keep money in pocket and not gain weight| Driving poorly (Fast, recklessly, etc.)|Get a bad driving record putting in danger potential jobs and possibly our license|People will not be mad at you in traffic jams. Employers will not have any problems hiring you. You will save money in cars and tickets.| Judging Co-Workers|Alienate myself from open discussions about problems we encounter and are trying to solve as a team|Develop a reputation of a team player and a problem solver who can work with others and rationally discuss solutions| Procrastination|Not finish projects and jobs I am put in charge of and miss opportunities to bigger projects that come with promotions and raises|Finish by jobs well within the time constraints and attract upper managements’......

Words: 352 - Pages: 2

Unit 3 Access Control

...Scenario 1: (DAC) Discretionary Access Control. Being that the business is small and not in need of higher security measures, it would be the easiest to maintain and monitor for a small business. Scenario 2: (MAC) Mandatory Access Control. The employees primarily communicate using smartphones; which proves as a possible security risk. MAC is stronger than DAC but, still easily monitored for a small business; which makes this the top choice for Top Ads. Scenario 3: (RBAC) Role Based Access Control. With the company being as large as it is and the employees traveling and/or working from home, the roles set by a Security Administrator would be the most secure and efficient way of providing different levels of clearance to individual users. It would take time to start from nothing but, once the security measures are in place it would be easy to monitor and to manage. Scenario 4: Content-Dependent Access Control. Since everything that the company does depends on the individual material being manufactured the above Access Control type should be apparent. Giving permissions by what is contained in each individual file is more costly but, a lot more secure. It also allows the company to monitor the data sent less as each document is given its own set of roles. Scenario 5: (RBAC) Role Based Access Control. With RBAC in place the security measures would be assigned to each user and monitored by the security administrator(s). Using this Access control method would allow for......

Words: 288 - Pages: 2

Unit 3 Discussion 1: Access Control Models

...Unit 3 Discussion 1: Access Control Models Scenario 1: (DAC) Discretionary Access Control. Being that the business is small and not in need of higher security measures, it would be the easiest to maintain and monitor for a small business. Scenario 2: (MAC) Mandatory Access Control. The employees primarily communicate using smartphones; which proves as a possible security risk. MAC is stronger than DAC but, still easily monitored for a small business; which makes this the top choice for Top Ads. Scenario 3: (RBAC) Role Based Access Control. With the company being as large as it is and the employees traveling and/or working from home, the roles set by a Security Administrator would be the most secure and efficient way of providing different levels of clearance to individual users. It would take time to start from nothing but, once the security measures are in place it would be easy to monitor and to manage. Scenario 4: Content-Dependent Access Control. Since everything that the company does depends on the individual material being manufactured the above Access Control type should be apparent. Giving permissions by what is contained in each individual file is more costly but, a lot more secure. It also allows the company to monitor the data sent less as each document is given its own set of roles. Scenario 5: (RBAC) Role Based Access Control. With RBAC in place the security measures would be assigned to each user and monitored by the security administrator(s). Using this......

Words: 295 - Pages: 2

Unit 3 Discussion 1: Access Control Models

...Unit 3 Assignment 1: Remote Access Control Policy Definition Learning Objectives and Outcomes * You will learn how to design a remote access control policy definition for an IT infrastructure. Assignment Requirements Richman Investments is an investment and consulting firm. The company wants to expand its business operations both in the U.S. and in foreign countries. It intends to eventually have 10,000 employees in 20 countries. The Richman corporate headquarters is located in Phoenix, Arizona. Currently, there are eight branch offices in: * Atlanta, Georgia * Chicago, Illinois * Cincinnati, Ohio * Denver, Colorado * Los Angeles, California * Montreal, Canada * New York City, New York * Washington, D.C. The North American offices have a total of 5,000 employees who use desktops, mobile computers, and wireless devices. The Phoenix office has an Internet connection to all remote offices because redundancy is extremely important to the company. There are several sensitive applications that all offices use. The management from each office share application information that is hosted at the corporate office. Design a remote access control policy for Richman using the appropriate access controls for systems, applications, and data access. Include the design and justification for using the selected access controls for systems, applications, and data access. Required Resources * None Submission Requirements ...

Words: 277 - Pages: 2

Flight Controls

...1. Flight Controls Purpose of flight controls: The purpose of a flight control system is transfer motion/force input from a pilot to a flight control surface. In a traditional aircraft, flight control systems are broken down by axis of control: pitch, roll and yaw. Flight control systems can be either reversible or irreversible. A reversible system is a flight control system where movement applied to the control surface moves the control in the flight compartment. A simple example is shown in Figure 1. Reversible flight control systems are used on smaller aircraft where the hinge moment (surface) loads are small enough that a mechanical linkage system is adequate. Another reversible flight control system is shown in Figure 2. This is a 2D representation of a system that shows some typical components in a reversible flight control system. The systems shown in Figures 1 and 2 both contain a cable system, however, reversible systems can also be designed using pushrods and bellcranks without cables. Figure 2 Reversible Flight Control System An irreversible system is a flight control system that utilizes powered controls so that movement of the surface will not move the control in the flight compartment. An example of an irreversible flight control system is shown in Figure 3. Figure 3 shows a mechanical system connected to a hydraulic actuator. The linkage positions the servo within the actuator that controls which side of the actuator sees high-pressure fluid and...

Words: 2918 - Pages: 12