【文章內(nèi)容簡介】 e gearbox.Exercise 1:Questions to the text:1. How many main sections can APU be divided into?2. What are the three main parts of a APU?3. Which part of the APU drives the gearbox?4. How does the fuel pump work?5. How many APUs does an aircraft have?Exercise 2:Describe with what you have learned in the text. Speak as much as possible with your own words.Fig. 9 APUPart Two: Read the following passage and memory as much as you can, and then describe the diagram below with your own words.The APU doors give access for servicing and maintenance.There are usually two doors located on the bottom of the rear fuselage. On small aircraft, there is only one door. Latches in the lower inboard edge of the access door hold and secure the doors closed.Exercise 1:Questions to the text:1. What is the function of the APU doors?2. How many doors does an APU usually have?3. Where does the APU door located?4. What is the purpose of the latches?Exercise 2:Describe Fig 10 with what you have learned in the text. Speak as much as possible with your own words.Fig. 10 APU doorsLesson SixFire ProtectionPart one: Read the following passage and memory as much as you can, and then describe the diagram below with your own words.The APU is a small engine which also has a fire detection system. The system must be operative when the APU is running.The APU fire warning system activates the same fire warning in the cockpit as for the engines.The system also has 2 features that are important if the cockpit is empty. One feature is a ground warning in the nose or main wheel well area. A red light flashes and a warning horn sounds.The APU fire detection sensor is the same type of continuous dual loop as for the engine fire detection system.Exercise 1: Questions to the text:1. When must the fire protection system be operative?2. Why there is a ground warning in the nose or main wheel well area?3. What kind of warning does the system will give if there is a fire?4. What type is the APU fire detection sensor?Exercise 2:Describe Fig 11 with what you have learned in the text. Speak as much as possible with your own words.Cockpit WarningGround WarningRed lightSensor loopFig. 11 APU Fire ProtectionPart Two: Read the following passage and memory as much as you can, and then describe the diagram below with your own words. When a fire starts, there are three ways to put out the fire: cool down the temperture。 remove the oxygen。 or remove the flammable materialsAll fire extinguisher agents use one or more of these effects to extinguish a fire.In an aircraft, a fire must be extinguished as quickly as possible. This is done either by an installed fire extinguishing system or by using portable fire extinguishers. Both methods use very effective extinguishing agents to put out a fire.In transport aircraft, fire extinguishing systems are installed on the engines, on the APU, in the toilets and in the cargo partments, if necessary for the partment classification.Exercise 1: Questions to the text:1. What are the principles for the distinguisher to put out a fire?2. Why a fire in an aircraft must be extinguished as soon as possible?3. How is a fire in an aircraft distinguished?4. Where are the distinguishers installed in transport aircraft?5. According to fig. 12, how many distinguishers are installed in the aircraft?Exercise 2:Describe Fig 12 with what you have learned in the text. Speak as much as possible with your own words.Toilet APU engineCargo partmentFig. 12 Fire Extinguisher LocatinLesson SevenEngine IgnitionPart One: Read the following passage and memory as much as you can, and then describe the diagram below with your own words.In this segment we will look at the operation and buildup of the igniter plug. You can find two igniter plugs on each engine, one for system A and the other for system B. In the cut view of the engine on the right you can see that the igniter plugs are installed in 2 positions in the bustion chamber below the centerline of the engine.Exercise 1: Questions to the text:1. What shall we learn in this segment?2. What does the word buildup mean here?3. How many igniters are there on each engine?4. Where are they installed?5. Which part of the diagram tells us the position of the igniter plug?Exercise 2:Describe Fig 13 with what you have learned in the text. Speak as much as possible with your own words. Fig. 13 Igniter InstallationPart Two: Read the following passage and memory as much as you can, and then describe the diagram below with your own words.The part of the ignition lead that runs along the core engine has a cooling air jacket. Air from the engine pressor passes through the gap between the conduit and the rubber insulation. Now you can start the airflow by doing this task. The cooling air enters through inlet holes and es out above the coupling nut. From here the air flows over the surface of the igniter plug and gives additional cooling. The cooling air for the lead is necessary because the copper wire increases its resistance with the temperature. So a hot lead decreases the igniter current and consequently the energy of the igniter spark.Exercise 1: Questions to the text:1. How is the ignition lead cooled?2. Where is the cooling air from?3. Why is the cooling air necessary?4. What will happen if the lead bees hot?Exercise 2:Describe Fig 14 with what you have learned in the text. Speak as much as possible with your own words.Fig. 14. Ignition Lead CoolingLesson EightEngine OilPart One: Read the following passage and memory as much as you can, and then describe