Aeronautical Information Services (AIS)




 

Standards and Recommended practices for Aeronautical Information Services were first adopted by the Council on 15 May 1953, and were designated as Annex 15 to the ICAO Convention. This Annex became applicable on 1 April 1954.

Each country provides aeronautical information concerning its own territory. It is published in the Aeronautical Information Publication (AIP) and in Notices to Airmen (NOTAM). ICAO personnel engaged in aeronautical information services do not provide actual service, but check on whether these services are provided in ICAO’s members States. NOTAM are classified into two categories, I and II. Both classes contain information concerning the establishment, condition or change in any aeronautical facility, service procedure or hazard the timely knowledge of which is essential to personnel concerned with flight operations.

Information generated by AIS and AIP system is directed to pilots before taking off. NOTAM information might include advice that a certain airspace will be temporarily closed because of rocket launching, for example, or that a non-directional radio navigation beacon at a particular location is inoperative.

In addition to NOTAM ICAO adopted a SNOWTAM, a special series of NOTAM informing about the presence or removal of hazardous conditions at airport due to snow, ice, slush or standing water on the aircraft movement areas of airports.

A pilot planning a flight will prepare his flight plan according to the NOTAM information. What information does a pilot need? This information is quite varied. First of all he wants to know which airway to follow to the aerodrome of his destination. Further information needed by the pilot is that about facilities available en route and at the point of destination, the length of the runways, the communication frequencies, meteorological information, etc. He fills out a flight plan giving the route he is to follow and the description of the route, the name of the aerodrome of his destination and also the name of the alternate aerodrome and other information. He must indicate whether he will fly IFR (Instrument Flight Rules) or VFR (Visual Flight Rules) or, a combination of both.

Having the information received from the pilot Air Traffic Control can control the flight.

 

Exercises

 

I. Ответьте на вопросы:

 

1. When did Annex 15 become applicable?

2. What is NOTAM?

3. What information does NOTAM contain?

4. Where is aeronautical information published?

5. Is AIP an international publication?

6. What is the task of ICAO aeronautical information services personnel?

7. When is the necessary information directed to pilots?

8. When does the pilot need the information?

9. What information does a pilot need to plan his flight?

10. How is a flight planned?

11. What flight rules there exist?

 

II. Переведите слова, обращая внимание на словообразующие элементы:

 

apply – appliance – applicable – applicant – application

provide – provider – provision - provisional

inform – informer – information – informal – informality – informative

direct – direction – directional – directly – director

locate - location - locally – localize – local

move – movement – movable – moveless - mover

service – serviceable – unserviceable

change – changeable – changeability – changeless

present – presence – presently – presentable – presentation

control – controllable – controller – uncontrollable

vary – variable – variability – variety – variation – variant

 

III. Найдите в тексте эквивалент следующим словосочетаниям:

 

стандарты и рекомендуемые практики, служба аэронавигационной информации, государства – члены ИКАО, выполнение полетов, зоны движения самолетов, частоты связи, запуск ракет, правила инструментального полета, правила визуального полета.

 

IV. Переведите на английский язык:

 

1. Аэронавигационная информация, касающаяся территории государства – члена ИКАО, публикуется в Сборнике аэронавигационной информации.

2. Сборник аэронавигационной информации содержит информацию о аэродромах вылета и назначения.

3. НОТАМ – международный сборник аэронавигационной информации, которая имеет большое значение для планирования и производства полетов.

4. Если аэродром назначения по каким-либо причинам закрыт, пилот следует на запасной аэродром, указанный в его плане полета.

5. Знание аэронавигационной информации обеспечивает безопасность и эффективность полетов.

6. Перед планированием полета пилот должен получить всю необходимую информацию, входящую в НОТАМ.

 

 

Weather

 

Weather is composed of a number of elements such as the temperature and humidity of the air, atmospheric pressure, the speed and direction of the wind, air visibility and of special phenomena such as fog, storms and others.

Pilots need the information about weather conditions along the route of flight and at the destination aerodrome. The object of the meteorological service is to contribute to safety, efficiency and regularity of air traffic.

There exist some sources of aviation weather information: surface observation, radar observation, automatic meteorological observation, pilot reports and others.

At every airport there is a meteorological station which is equipped with special instruments recording all changes in the atmosphere. They indicate air pressure and temperature, record wind speed and direction as well as the movements of clouds. All the observations are summed up on special weather charts. The observations at the airports are made every 30 minutes and every 15 minutes if the weather suddenly gets worse or better.

Preparing for the flight the pilot is to get the latest weather information and weather forecasts along the planned route and at the point of destination and the alternates.

At agreat number of met. stations situated along the airways complete weather observations are made and then transmitted to weather forecast centres by telephone, telegraph, radio and thousands of miles of teletype circuits. Thus, the pilot has a complete picture of the weather.

20-30 minutes before entering the aerodrome area the controller gives the pilot full information about the terminal weather. At many airports the information helpful for landing and take off is continuously broadcast on a navigational aid frequency. Prior to descent the pilot requests the actual weather and aerodrome conditions for the airport he is going to land.

It is considered that landing of an aircraft is probably the most difficult operation which a pilot has to perform and the standards of visibility required are higher than for any other phase of flight.

It is known that fog, rain and clouds often affect the aircraft operation. For many decades attempts were made to make flying independent of weather conditions or, in other words, to allow an aircraft to land under very low or zero visibility.

Now there exist several categories set up by ICAO:

Category I - 200 ft ceiling and 1/2 mile visibility;

Category II- 100 ft ceiling and I/4 mile visibility;

Category III - landing under zero-zero conditions.

Met. services for aviation require much work to collect data and prepare weather charts. This work is especially difficult for long-distance flights over vast areas with different climatic conditions.

Nowaday met. services for aviation are almost fully automated. Automated Surface Weather Systems are installed at the airports of many countries. The System provides for the measurements, processing and display of the following meteorological parameters: wind direction and speed, air temperature and dew point t°, runway visual range, minimum cloud height, barometric pressure.

The use of lazers makes it possible to give pilots all the necessary information when they land under low visibility conditions. The introduction of these systems has greatly increased the reliability and safety of flights.

Satellite meteorology has become an independent area of science. Weather forecasts based on information from outer space make forecasts more accurate and help to save a great sum of money annually.

At present the work of meteorologist becomes easier thanks to computers which make calculations quicker and due to them the weather forecast service is becoming more reliable. The use of satellites and computers greatly increases the accuracy of weather forecasts.

 

Exercises

 

I. Ответьте на вопросы:

1. What elements are included in weather report?

2. What is the object of meteorological service?

3. How often is weather observation made at the airport?

4. What do the instruments at the meteorological stations indicate?

5. What weather information does the pilot get before the flight?

6. Do the pilots obtain weather information while in flight?

7. When does the controller give the pilot full information about the terminal weather?

8. What phase of flight does especially depend on weather conditions?

9. What weather phenomena affect the aircraft operation?

10. What categories are set up by ICAO?

11. What does Automated Surface Weather System provide?

12. When do lazers help the pilots?

13. What is the advantage of satellite meteorology?

14. What other instruments make weather forecast service more reliable?

 

II. Переведите слова, обращая внимание на словообразующие элементы:

 

direct – direction

visual – visually – visibility

observe – observation – observer

equip – equipment

transmit – transmission – transmitter

regular – regularity

depend – dependence – dependent – independent

provide – provision

accurate – accurately – accuracy – inaccurate

rely – reliable – reliability – unreliable

 

 

III. Найдите в тексте эквивалент следующим словосочетаниям:

 

сводки погоды, погодные условия, давление воздуха, скорость ветра, направление ветра, нижняя граница облачности, прогноз погоды, центр прогнозирования погоды, прогностические карты, станция обеспечения полета, погода аэродрома посадки

 

 

IV. Переведите на английский язык:

 

1. Погода состоит из таких элементов как температура и влажность воздуха, атмосферное давление, скорость и направление ветра, видимость.

2. Дождь, гроза, туман, шторм и другие явления опасны для полета.

3. Перед полетом пилот идет в метеобюро, чтобы получить сводку погоды и прогноз не только по своему маршруту, но и в пункте назначения.

4. В каждом аэропорту есть метеостанция со специальными приборами, регистрирующими все изменения в атмосфере.

5. Имея все данные о погоде, синоптики составляют погодную карту.

6. Во многих аэропортах информация о погоде непрерывно транслируется на определенной частоте.

7. Посадка самолета – самая трудная операция.

8. Стандарты видимости для посадки выше, чем для любой другой фазы полета.

9. Сейчас большинство метеостанций почти полностью автоматизированы.

10. Автоматическая система погоды показывает скорость и направление ветра, температуру воздуха, точку росы, дальность видимости на полосе, высоту облачности.

11. Прогноз погоды, полученный со спутников, делает его точнее.

12. Использование спутников и компьютеров повышает точность прогноза погоды.

 

 

Airport

There are airports in every country.

In theory, an aircraft can fly an infinite number of paths through the air from any surface point to any other. In practice, paths of flight lead from airport to airport. Aircraft not only need proper landing and take off facilities. Moreover, those who use aircraft need services and accommodations which the airport must provide.

In the early days of aviation when aeroplanes were small a cow pasture could be used as a "flying field". But with the continuous increase of air traffic and the introduction of high-capacity aircraft it became necessary to expand airport facilities, to build new terminal buildings and to construct new airports.

In the interest of aviation safety and air traffic assistance and control air traffic rules were established. The rules relate chiefly to weather minima, flight altitudes and traffic patterns which are to be used under different circumstances. Much can be learned about the nature of a specific airport from aeronautical charts which pilots use. For example, the chart reveals the type and size of an airport, the radio facilities it uses and its altitude (aerodrome elevation) and location.

The modern airport is a complex structure, a centre of most diversified services. Millions of passengers and thousands of tons of airfreight are handled by modern airports. Thousands of people are working at airports.

In practical any airport can be divided into two main parts: the landing area (runways and taxiways) and the terminal area (aprons, buildings, car parking areas, hangars, etc.). There is also a third part - terminal air traffic control. The landing area includes runways and taxiways. The number of runways, their length and location depend on the volume and character of traffic, the prevailing wind direction and other factors.

The runways and taxiways should be arranged so that to prevent delays on landing, taxying and take off operations.

Aprons are required for aircraft to make final checks prior to departure.

The main function of the terminal buildings is to handle the departing and arriving passengers and their baggage.

Among the airport services are: flight assistance service, air traffic control services - airport traffic control, approach control, air route traffic control, radio communications and weather observation and forecasting service.

At every airport there is a number of supplementary services such as rescue and security services, an airport clinic, a fire brigade, special vehicles and equipment units (water trucks, tow tractors, etc.).

Other services include maintenance, overhaul and repair of stationary and mobile equipment, the supply of electricity, water, heat and air conditioning.

The facilities include runways, air navigational aids, passenger and cargo terminals. The airport has a hotel, a post office, bank offices, restaurants, car rental firms, etc. In the terminal there is everything for quick passenger handling: check-in desks, electronic flight information board of departure and arrival times, the baggage claim carousel and many others.

Nowadays there exists one more pressing problem - that of air piracy. The number of acts of unlawful interference resulted in deaths and injures of some hundreds of persons. So the ICAO Council has adopted Amendment 8 to Annex 17 (Security). The Amendment covers security screening and inspecting passengers, checked baggage, security control over cargo, courier and express parcels and mail. Every airport has new specific detection systems capable to screen airline passengers and their baggage within less than 8 seconds.

 

Exercises

 

I. Ответьте на вопросы:

1. Why was it necessary to build new terminal buildings and construct new airports?

2. Why were air traffic rules established?

3. What do these rules relate to?

4. What does the aeronautical chart reveal?

5. What are the main two parts of the airport?

6. What is the third part of the airport?

7. What factors influence the number of runways, their length and location?

8. What does the aircraft crew do on the apron?

9. What is the main function of the terminal building?

10. What airport services do you know?

11. What supplementary services are there at the airport?

12. What does the electronic information board indicate?

13. What equipment is used at the airport for preventing piracy?

14. How many airports are there in Petersburg?

15. What is the distance between the center of the city and Pulkovo-1?

16. How can you get to the airport?

17. Is there an airport in your native city?

18. Is it an international or domestic?

 

II. Переведите слова, обращая внимание на словообразующие элементы:

continue – continuation – continuous – continuously

introduce – introduction – introductory

necessary – necessity – necessitate

divide – division – divider

depend – dependent – dependence

prevent – prevention – preventive

detect – detection – detective – detector

depart – departure

arrive –arrival

 

III. Найдите в тексте эквивалент следующим словосочетаниям:

 

средства посадки и взлета, правила управления воздушным движением, схема движения, радиосредства, зона посадки, преобладающее направления ветра, службы аэропорта, контроль подхода, наблюдение за погодой, служба поиска и спасания, обслуживание пассажиров, грузовой терминал.

 

IV. Переведите на английский язык:

 

1. Почти в каждом городе есть аэропорт, большой или маленький.

2. Размер аэропорта зависит от объема перевозимых пассажиров и груза.

3. Современные аэропорты обслуживают миллионы пассажиров и перевозят огромное количество груза.

4. С увеличением воздушного транспорта и с введением новых современных самолетов старые аэропорты расширяются и реконструируются.

5. Для обеспечения безопасности полетов существуют правила воздушного движения.

6. Прибывающие и убывающие пассажиры обслуживаются в здании аэровокзала.

7. Число ВПП зависит от объема перевозок.

8. Расположение ВПП зависит от превалирующих направлениях ветра.

9. Пилот пользуется аэронавигационными картами.

10. Эти карты указывают тип и размер аэропорта, его радиосредства, длину и расположение ВПП и т.д.

AIRCRAFT

During those years which have passed since the first aeroplane was built, aviation has enjoyed phenomenal progress. At present aviation influences many aspects of social life.

In the dynamic world of today, aviation provides a rapid transportation link between different population centres. In many places the aeroplane is the only known vehicle for the large-scale movement of passengers and freight over large distances. The airplane has made it possible to patrol the forests, to fight their fires, to assess their timber resources and to plan their harvesting. It has made an enormous contribution to the photographing and mapping of the vast territories, to exploring and prospecting for mineral wealth and to studying and assessing the water resources.

As for the helicopter, besides its use for passenger transportation, this type of aircraft has proved its value in special applications where vertical take off-landing are required. Helicopters are widely used in search and rescue operations in emergency situations or when some accident occurs.

The main components of airplanes are as follows:

1. The fuselage is the main body of the airplane and contains the pilot's compartment (cockpit) and passenger and baggage compartments. The cockpit contains the flight controls and instruments.

2. The wings are the main lifting surfaces which support the aircraft in flight. Aircraft may be divided into monoplanes and biplanes.

3. The tail unit or empennage consists of a vertical stabilizer and rudder and the horizontal stabilizer and elevators to provide the necessary stability in flight.

4. The three basic flight control surfaces are the ailerons, the elevators and the rudder.

5. The power plant is the heart of the airplane. There are many types of engines: turboprop, turbojet, turbofan, rocket engines, etc.

6. The landing gear or undercarriage is used during manoeuvering of the aircraft on the ground while taxying, taking off and landing. In flight the retractable landing gear is retracted into the wing or the fuselage structure.

AIRCRAFT INSTRUMENTS

Aircraft instruments are basically devices for obtaining information about the aircraft and its environment and for presenting that information to the pilot. Their purpose is to detect, measure, record, process and analise the variables encountered in flying an aircraft. They are mainly electrical, electronic or gyroscopic. Modern aircraft have a computer on board. They are concerned with the behavior of the engines, the speed, height and attitude of the aircraft and its whereabouts. Instruments concerned with the whereabouts of an aircraft are navigation instruments.

An aircraft usually takes the name of the designer or manufacturer. Here are some of the Russian designers: Tupolev, Ilyushin, Antonov, Yakovlev. Manufacturer's names are represented by Boeing, Douglas, Lockheed and others. The name of the designer or manufacturer is followed by a type code, known in some airlines as a class. For example: Ilyushin-96 (designer's name and type code), Boeing-747 (manufacturer's name and type code).

Exercises

 

I. Ответьте на вопросы:

1. What does aviation provide?

2. Where are helicopters used?

3. What types of aircraft do you know?

4. Name the main parts of the aircraft.

5. What does the fuselage contain?

6. What for are the wings required?

7. What are the components of the wing?

8. What does the tail unit provide?

9. What is the power plant?

10. What types of engines do you know?

11. When are the landing gears used?

12. What is the purpose of aircraft instruments?

13. What Russian and foreign designers do you know?

14. What name does the aircraft take?

 

II. Переведите слова, обращая внимание на словообразующие элементы:

transport – transportation

move – movement – movable

possible – possibility – impossible

apply - application

power – powerful

retract – retraction – retractable - unretractable

require – requirement

provide – provision

measure – measurement

contribute – contribution

 

III. Найдите в тексте эквивалент следующим словосочетаниям:

 

населенный центр, минеральные и водные ресурсы, применение авиации, перевозка пассажиров, пассажирское и грузовое отделения, приборы самолета, навигационные приборы, рули управления самолетом, пилотская кабина, конструкция фюзеляжа, аварийная ситуация, поисково-спасательные операции.

 

IV. Переведите на английский язык:

1. Огромный прогресс сделан в авиации за последнее десятилетие.

2. Авиация применяется во многих аспектах общественной жизни.

3. Авиация обеспечивает быструю перевозку пассажиров и груза из одной точки в другую.

4. В некоторых местах авиация является единственным средством перевозки.

5. Вертолет удобное средство передвижения благодаря вертикальному взлету и посадки.

6. Фюзеляж является основной частью самолета.

7. Несущими поверхностями самолета являются крылья.

8. Крылья и хвостовое оперение состоят из подвижных частей, таких как руль высоты, руль поворота, руль направления, стабилизатор, элерон.

9. Шасси используются при рулении на земле и убираются в крыло после взлета.

10. В кабине пилота много приборов, показывающих скорость и высоту полета, работу двигателя и другую информацию.

11. Современные самолеты имеют на борту компьютер.

 

 

Safety

 

Safety is the most important problem in aviation. The prevention of collisions between aircraft in the air and on the ground is the main task of aviation specialists.

The achievement of aviation safety is the result of progress in many sciences and disciplines including engineering, aerodynamics, meteorology, psychology, medicine and economics.

Safety is ensured by thousands of ICAO and governmental regulations, by high standards in the design and manufacture of an aircraft and by rigid (strict) procedures of airline safety practices.

The aviation industry is constantly taking steps to prevent accidents but the crashes do occur time after time. They result from different causes: failure in the aircraft structure, human errors, navigational failures, malfunctioning of airborne and ground aids, hazardous weather conditions and so on.

 

Poor knowledge of English can also contribute to or result in an accident or incident. Therefore ICAO revised the provisions related to the use of the language for radiotelephony communications and demands good discipline to follow more closely to standard phraseology in all air-ground exchanges.

Experience has shown that phraseology alone is not sufficient to cover all of the potential situations, particularly in critical or emergency situations. That’s why proficiency in common or plain language is also of great importance.

One of ICAO’s chief activities is standardization in all spheres of aviation operations. The main ICAO document is SARPS (International Standards and Recommended Practices). Its main task is to provide the necessary level of standardization for safe and regular air operations.

 

 

Exercises

 

I. Ответьте на вопросы:

1. What is the most important problem in aviation?

2. What is the main task of aviation specialists?

3. By what means is safety ensured?

4. What factors may cause accidents?

5. What can you say about the role of language in the problem of safety?

6. Can radiotelephony alone cover all of the potential situations?

7. What is the main document ICAO?

8. What is the main task of SARPS?

 

II. Переведите слова, обращая внимание на словообразующие элементы:

 

terror – terrible – terribly – terrific

danger – dangerous – dangerously

care – careful – careless – carelessness

safe – safety – unsafe

prevent – preventive – prevention

collide – collision

special – specially – specialist – speciality – specialize – specialization

achieve – achievement

ensure – insurance

govern – governor – government – governmental

regular – regularly –regulation – regularity – irregular

differ – different – differently –difference

fail – failure

navigate – navigator – navigation – navigational

hazard – hazardous

know – knowledge – unknown

provide – provision – provider

relate – relation – relative – relatively – relativity

communicate – communication – communicative – community

sufficient – sufficiently – sufficiency – insufficient

proficient – proficiently – proficiency

necessary – necessarily – necessity – unnecessary

critical – critically – criticize – criticism – uncritical

close – closely

 

III. Переведите на английский язык:

 

1. Самая важная проблема в авиации – безопасность.

2. Для обеспечения безопасности полетов ИКАО установила специальные правила и процедуры.

3. Все государства – члены ИКАО должны строго соблюдать все правила и процедуры, принятые ИКАО.

4. Одна из самых задач авиационных специалистов – предотвращать столкновение самолетов в воздухе и на земле.

5. Достижения в технике, аэродинамике и других науках повышают авиационную безопасность.

6. Еще одним условием, обеспечивающим авиационную безопасность, является стандартизация во всех авиационных операциях.

7. Всем авиационным специалистам очень важно знать английский язык.

8. Хорошее знание английского языка необходимо для обеспечение безопасности полетов.

9. Причина катастрофы - человеческая ошибка.

10. Самолет не смог вылететь из-за опасных погодных условий.

11. Отказ двигателя привел к катастрофе.

12. В районе аэропорта аварийная ситуация.

13. Одна из главных задач ИКАО – обеспечивать необходимый уровень безопасности.

 

Air traffic Control

 

The ATC’s first concern is safety, that is the prevention of collision between aircraft in the air and orderly flow of traffic.

To perform their exacting duties air traffic controllers need adequate facilities. The introduction of radars greatly assists in expediting the flow of traffic reducing the separation minima. Computers are also a powerful tool. They give assistance by taking over routine tasks but they must not dominate the system. The human controller is much more efficient than any current system because it is he who takes responsibility for controlling aircraft and it is he who takes final decisions in all situations including conflicting and emergency.

During periods of heavy traffic controllers work under high stress. They may control several aircraft simultaneously, their number sometimes exceeding 15 and even more. Controllers’ slightest error may cause loss of human lives and property.

Top physical and mental condition is a vital requirement for atc controllers. Therefore they undergo strict medical examination which are repeated at periodic intervals.

The problem of the selection and training of ATC personnel is extremely important. The controllers should possess a number of qualities which are absolutely necessary for them: a high degree of morality, a very good nervous and emotional balance, a sound critical judgment, a readiness for decisions and an instinct for team work. To become a highly professional controller one must be proficient not only in specialized aviation English but also in plain language because aviation safety depends on accurate pilot – controller communications.

The training of ATC personnel is carried out by different methods using various teaching aids, systems and simulators. Modern simulators can reproduce the whole ATC task from take-off to landing including all manoeuvers even the dangerous ones.

 

Exercises

 

I. Ответьте на вопросы:

1. What is the main task of ATC activity?

2. How can controllers expedite the flow of traffic?

3. What aids and systems do controller use to control air traffic?

4. Can any aids or systems substitute a human controller? If not, then why?

5. What are the working conditions of controllers?

6. How many aircraft may controllers control at peak traffic periods?

7. What is one of the vital requirements for ATC controllers?

8. How often do they undergo medical examinations?

9. What qualities should a person possess to become a controller?

10. What can you say about the role of the English language in controller’s work?

11. How are controllers trained?

12. Can modern simulators reproduce conflicting and emergency situations?

 

 

II. Переведите слова, обращая внимание на словообразовательные элементы:

prevent – prevention – preventive

provide – provision – provider – provisional

order – orderly

perform – performance

exact – exactly – exactness

introduce – introduction – introductory

reduce – reduction

power – powerful – powerless

efficient – efficiently – efficiency

responsible – responsibility – response – respond

decide – decision – decisive

strict – strictly – strictness

necessary – unnecessary – necessity

depend – dependent – dependence – independent

train – trainer – trainee – training

carry – carrier – carriage

differ – different – indifferent – differently

simulate – simulator – simulation

 

 

III. Переведите на английский язык:

1. Существует много технических средств, помогающих диспетчерам в их работе.

2. Главным элементом в системе УВД является диспетчер, т.к. он принимает окончательное решение в любой ситуации.

3. Так как работа диспетчера очень ответственна необходим строгий отбор и подготовка персонала УВД.

4. Диспетчер должен иметь хорошее физическое здоровье умение принимать решение и работать в команде.

5. Различные тренировочные средства, системы и специальные тренажеры используются для подготовки персонала УВД.

6. Современные тренажеры позволяют имитировать все этапы полета, включая аварийные ситуации.

7. 15 или даже больше самолетов находятся под контролем диспетчера в период интенсивного движения.

8. Электронные средства не могут заменить диспетчера. Они могут только помогать ему.

9. Диспетчер не должен допускать ошибок, так как это может привести к потере человеческих жизней.

10. Минимумы эшелонирования будут уменьшены в ближайшем будущем.

11. Какой европейский центр подготавливает диспетчерский персонал?

12. Этот тренажер не может воспроизводить аварийные ситуации.

 



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