,Bullet level 24 pt.Arial bold sentence case,Second level 20 pt.Arial bold sentence case,Third level 18 pt.Arial bold sentence case,Forth level 16 pt.Arial bold sentence case,*,NBAA 2003,#1 Title 28 Pt.Arial Bold Title Case,Safety Conference,A,T,S,2,0,0,3,Bullet level 24 pt.Arial bold sentence case,Second level 20 pt.Arial bold sentence case,Third level 18 pt.Arial bold sentence case,Forth level 16 pt.Arial bold sentence case,#1 Title 28 Pt.Arial Bold Title Case,Civil Aviation Flight University of China,A,utopilot,F,light,D,irector,S,ystems,自动驾驶飞行指引系统,Autopilot Flight Director Systems(AFDS),Civil Aviation Flight University of China,It is,logical,to integrate the two systems,the autopilot and the flight director,into a combined autopilot flight director system(AFDS)so that certain processing functions can be,share,d.,In a modern system,it is normal for the AFDS to contain a separate FD computer that provides display instructions to the EFIS system,and the same instructions to the autopilot computer,which then converts the signals to appropriate commands for the servos.,Autopilot Flight Director Systems(AFDS),AFDS Mode Control Panel,Civil Aviation Flight University of China,AFDS Mode Control Panel,Mode selectors of the Push ON/Push OFF type are located at various positions on the panel.Each selector has a bar light incorporated in the switch face,to indicate the selection.,Armed and engaged selections are displayed on the ADI,with,armed selections,usually shown,in white or amber,and,engaged modes in green.,Figure 3.9,Civil Aviation Flight University of China,AFDS Mode Control Panel,Flight Director,F/D ON/OFF,A flight director(F/D)switch is provided for each pilot.When OFF,FD command bars are withdrawn.,When first selected ON,the command bars will be displayed,in the Take-Off mode(TO)if on the ground,or in current values of VS and HDG HOLD if airborne.,In the TO mode,the command bars will show wings level and about 810ANU.,Figure 3.9,Civil Aviation Flight University of China,AFDS Mode Control Panel,Autopilot,AP,Engage Switches,The autopilot is normally engaged in the Command,(CMD)mode,.Except during an ILS approach,only one autopilot can be engaged at a time;selection of another autopilot disconnects the first.,Pushing the second autopilot CMD switch when in the approach mode engages the remaining autopilots at 1,500 ft radio altitude,and arms the autoland functions of runway alignment,flare,landing and rollout.,Figure 3.9,Civil Aviation Flight University of China,AFDS Mode Control Panel,Disengage bar,The DISENGAGE bar at the bottom of the panel must be,UP,to allow the autopilots to be engaged.By moving the DISENGAGE bar,down,all three autopilots are disconnected from the flight control servos.,Red(or Yellow)strip,is exposed when bar is down.,Figure 3.9,Civil Aviation Flight University of China,When an engaged autopilot is disconnected,usually by pressing the,disconnect button,on the control column,a warning siren sounds,which can be cancelled by pressing the disconnect button a second time.,A,fault,in an engaged autopilot may also cause a disconnect.,AFDS Mode Control Panel,Figure 3.10,Figure 3.11,Civil Aviation Flight University of China,A/P DISC light,indicates any autopilot is disengaged,either due to malfunction or pushing autopilot disconnect switch.,AUTOPILOT light,indicates fault in an engaged mode of any autopilot.,The light goes off when condition is corrected or affected autopilot is disengaged.,AFDS Mode Control Panel,Figure 3.10,Figure 3.11,Civil Aviation Flight University of China,AFDS Mode Control Panel,Navigation Modes,LNAV,The LNAV selector,when pushed,will arm the autopilot to,capture and then track,the lateral navigation track entered into the FMCS.,LNAV mode is disengaged by selecting HDG HOLD or HDG SEL mode,or when localizer capture occurs.,Figure 3.9,Civil Aviation Flight University of China,AFDS Mode Control Panel,Navigation Modes,VNAV,The FMC of an advanced aircraft is capable of providing vertical navigation by computing a climb or descent profile to satisfy various requirements,such as maximum rate,optimum profile,maximum speed,or waypoint altitude restrictions.,When the FMC has been programmed,and VNAV is selected,the autopilot will,follow the required profile,with the engaged autothrottle system controlling the programmed speed.,Figure 3.9,Civil Aviation Flight University of China,AFDS Mode Control Panel,Navigation Modes,VNAV,VNAV mode can be,terminate,d by any of the following.,selecting vertical speed or altitude hold,selecting speed or EPR,selecting FL CH,capturing glideslope,reaching altitude in MCP altitude indicator before reaching FMCS target altitude.,Figure 3.9,Civil Aviation Flight University of China,AFDS Mode Control Panel,Heading Control,Heading Hold,The heading hold switch commands the autopilot to,maintain,present heading.,The ADI will show HDG HOLD in the roll mode display.,Heading hold is basic roll mode for flight directors and autopilot if no other roll mode is e