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                             Aircraft 
                              Electrical Systems  
                                  theory and principles  
                                  direct current  
                                  alternating current  
                                  electrical generators and motors 
                               
                                  airborne sources of electrical 
                              power  
                                  aircraft electrical systems  
                                  aircraft lighting systems  
                                  engine ignition and electrical 
                              systems  
                            Hydraulic 
                              and Pneumatic Systems  
                                  hydraulic and pneumatic power 
                              systems  
                                  hydraulic landing gear systems 
                               
                                  aircraft brake systems  
                            Fuel and 
                              Propeller Systems  
                                  aircraft fuel systems  
                                  propellers  
                            Aircraft 
                              Auxiliary Systems  
                                  cabin atmospheric control systems 
                               
                                  ice and rain control systems 
                               
                                  fire protection systems  
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