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*Bleed air generated on the 5th and 9th Stage of Engine compressor(or by APU or Ground) used forPressurization/Air conditioningAnti-icingEngine StartingHYD resorvoir pressurizingetc. *3 Bleed valves are electrically controlled pneumatically operated. means when the Bleed air switch is ON, actual Bleed air valve will not operated without pneumatic pressure(Bleed Air) from engine.So, normal proced..

B737NG Fuel system Schematic.*With total 6 pumps, 2 in the No.1 Tank, 2 in the Center Tank, 2 in the No.2 Tank. Pumps on each tank powered by different source(Left and Right AC) and center tank has higher pressure than other pumps. *Isolation valve located the center of fuel lines. with this valve, you can crossfeed fuel from other tank. it's source is Battery(DC)also, you can transfer or manual..

B737NG Series Electrical Diagram*B737NG has 1 Battery, 2 IDG from each engine, 1 Generator from APU.*IDG(Integrated Drive Generator = CSD(Constant Speed Drive)+Generator, Attached in the Acc. Gear box on each engine.*AC power from Engine or APU supplied thru respective AC TRANSFER BUS and to the electrical unit requiring AC power.*3 TR(Transfomer Rectifier) Units Convert AC to 24v DC. Supply DC ..

B737NG Hydraulic system consists of 3 HYD System. Study yourself HYD A, HYD B, HYD STBY. *HYD A and HYD B have 2 pumps on each. one is EMDP(Electric Motor Driven Pump), EDP(Engine Driven Pump)*STBY HYD has only one EMDP. *Power Transfer Unit - In flight with HYD B EDP Fails, it will activate.PTU valve opens only flaps 1 or 5 for 737-800, helps LEDs to operate *Activating STBY HYD1. Any of FLT CO..

B737NG Pressurization Panel located on the right fwd side of FWD OVERHEAD panel. Setting Cruise Altitude. and landing airport altitude. Pressurization system can be selected with 3 position.the switch located bottom on the picture. AUTO, ALTN, MAN AUTO mode - 2 CPC(Cabin pressurization computer) will control pressurization systemALTN mode - one of the CPC will control pressurization systemMAN mo..

FWD OVERHEAD *white colored panels are associated with fire handle. ELECTRICAL SYSTEM HYDRAULIC SYSTEM FLIGHT CONTROLS PNEUMETIC SYSTEM PRESSURIZATION