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.3 APU Bleed Air Isolation ValveIndicates open or closed position of isolation valve.4 External Air Indication" displayed if a pack operating with APU and engines off, or bleed air ductspressurized with APUand engines off" indication remains displayed momentarily after external air sourceremoved5 Outflow Valves PositionIndicates position of outflow valves.6 Outflow Valve Control SourceMAN - indicates manual control of outflow valves.AUTO - indicates FMS control of outflow valves.7 High Flow IndicationHI FLOW -" pack operating in high flow mode" indication removed in normal flow or when pack OFF8 Bleed Air Duct PressureWhite - 12 psi andabove.Amber - 11 psi and below.9 Wing Anti-ice IndicationIndicates wing anti-ice on.10 Isolation ValveIndicates open or closed position of isolation valve.Copyright © The Boeing Company.See title page for details.December 01, 1999 D6-30151-425 2.10.13Air Systems -Controls and Indicators747 Operations Manual11 Engine Bleed Air ValveIndicates open or closed position of engine bleed air valve.12 Nacelle Anti-ice IndicationIndicates nacelle anti-ice on.Copyright © The Boeing Company.See title page for details.2.10.14 D6-30151-425 December 01, 1999Air Systems -Controls and Indicators747 Operations ManualDuct Pressure and Cabin Altitude IndicationsDuct pressure, cabin altitude, rate, landing altitude, and differential pressure aredisplayed when:" landing altitude MAN" cabin altitude in caution (amber) or warning (red) range" cabin differential pressure in caution (amber) or warning (red) range" ECS or ENG synoptic selected on secondary EICAS display130 DUCT PRESS 305CAB ALT 6250 RATE 06AUTO 88LDG ALT 100 ~P234LDG ALT 5300MANPRIMARY EICAS DISPLAY1 Bleed Air Duct PressureWhite - 12 psi andabove.Amber - 11 psi and below.2 Cabin AltitudeIndicates cabin altitude.3 Landing Altitude" inhibited if both cabin altitude controllers A and B fail" inhibited if both left and right outflow valves are in manual controlCopyright © The Boeing Company.See title page for details.December 01, 1999 D6-30151-425 2.10.15Air Systems -Controls and Indicators747 Operations Manual4 Landing Altitude SelectionAUTO (white) - altitude set automatically from FMC.MAN (amber) - altitude set by Landing Altitude selector.5 Cabin Rate of ClimbIndicates cabin altitude rate of climb.6 Cabin Differential PressureIndicates cabin differential pressure.Copyright © The Boeing Company.See title page for details.2.10.16 D6-30151-425 December 01, 1999747 Operations ManualAir Systems Chapter 2Air Conditioning System Description Section 20IntroductionThe air conditioning system supplies conditioned bleed air and recirculated cabinair at a controlled temperature throughout the airplane.The system supplies conditioned air to the flight deck shoulder heaters.The system supplies ventilation for the passenger cabin:" lavatories" galleys" flight deck crew rest" door 5 crew restPack control, zone temperature control, cabin air recirculation, fault detection, andoverheat protection are all automatic.Backup system control modes operate in theevent of system failures.The airplane is divided into seven temperature zones:" flight deck" upper deck" five main deck cabin zones A through EAir Conditioning PacksThree identical air conditioning packs cool bleed air from the engines, APU, orhigh pressure air from a ground source.Bleed air is precooled before entering thepack.The packs are controlled by two identical pack controllers, A and B.Eachcontroller has three separate channels, one for each pack.Control of the packsswitches automatically to the other controller at touchdown.If a controller detectsa fault in a pack channel, control of the respective pack switches to the othercontroller.Pack output increases during high pack demand periods (to compensate for afailed pack or recirculation fan), or is limited during high bleed air demand periods(such as for gear retraction).When a pack controller is placed in NORM, A, or B, the pack valve opens, whichallows bleed air to flow into the pack.The pack valve is controlled electrically by the pack controller and opens by bleedair pressure.Each pack valve has two flow settings, normal and high.During cruise, normalflow minimizes bleed air demand on the engine to reduce fuel consumption.Packs may be set manually to high flow by pushing the High Flow switch ON.Copyright © The Boeing Company.See title page for details.April 01, 2001 D6-30151-425 2.20.1Air Systems -Air Conditioning SystemDescription747 Operations ManualPack Non Normal OperationPack control, fault detection, and overheat protection are all automatic.When anoverheat or controller fault is detected, the respective pack valve closes resultingin a pack shut down.If a pack controller does not switch automatically to the other controller, selectingA or B manually selects the respective controller when the Trim Air switch is ON.An attempt to restore pack operation may be made by pressing the Pack Resetswitch.If the pack cannot be reset, placing the respective Pack Control Selector to OFFextinguishes the pack system fault light for use by the operating packs [ Pobierz caÅ‚ość w formacie PDF ]