1. B747-400 Flight Crew Conversion HYDRAULICS www.theorycentre.com

2. HYDRAULIC CONTROL PANEL ENGINE HYDRAULIC PUMP CONTROL SWITCHES ON – Engine driven pump (EDP) will pressurize system with engine rotating PRESS – Low pressure from engine driven pump

4. HYDRAULIC CONTROL PANEL AUXILIARY HYDRAULIC PUMP CONTROL SWITCH AUX – Selects Auxiliary pump to operate NOTE: Electrical power is from Ground Handling Bus (GHB) Pump will stop operating if EDP is producing pressure

5. HYDRAULIC CONTROL PANEL SYS FAULT LIGHT Light will illuminate for 3 reasons: Low hydraulic quantity - >HYD QTY LOW Hydraulic fluid overheat - HYD OVHT SYS Low system pressure - HYD PRESS SYS NOTE: HYD PRESS SYS is a caution level EICAS message

6. HYDRAULIC SYSTEM 1,2, & 3 1,2, 3 T RETURN P P P Q

7. HYDRAULIC SYSTEM 4 T RETURN P P P Q

8. HYDRAULIC SYSTEM 4 RETURN GROUND HANDLING BUS ON GROUND ONLY P P P

9. HYD QTY APU: HYD PR HYD TEMP EGT OXY PR : CREW MAIN BATT V - DC APU BATT V - DC A - DC A - DC PASS 1 2 3 4 1.00 0.25 LO 0.55 RF 1.00 3250 3250 3250 3250 50 50 50 108 750 100.1 85.5 0.35 RF N1 N2 OIL QTY 1750 1650 28 15 27 38 CHG DIS RUD AIL SPL ELEV AIL SPL Hydraulic System Data Quantity Pressure Temperature RF < 0.75 to 0.35 (inhibited in flight) LO < 0.34 HYDRAULIC SYSTEM INDICATIONS ELEC FUEL ECS HYD DRS GEAR ENG STAT CANC RCL

10. HYDRAULIC SYSTEM SYNOPTIC

11. HYDRAULIC SYSTEM P&W ENGINE THRUST REVERSERS

12. THE END