Boeing 747 Fuel Jettison boeing 747 pilot training course

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BOEING 747 FULL PILOT TRAINING COURSE STEP BY STEP 


Fuel Jettison
The fuel jettison system allows jettison from all fuel tanks. Override/jettison
pumps in main tanks 2 and 3 and the center wing tank pump fuel overboard
through the jettison nozzle valves.
Fuel jettison is initiated by rotating the fuel jettison selector to A or B. When a
jettison control system is selected, the fuel temperature indication on EICAS is
replaced with the fuel to remain quantity indication. The jettison manifold and
jettison time display on the fuel synoptic.
Rotating the Fuel To Remain selector decreases or increases the fuel to remain
quantity.
Pushing either fuel jettison nozzle valve switch ON activates all override/jettison
and transfer/jettison pumps in the tanks containing fuel (pump switches must be
ON) and opens the required jettison and transfer/jettison valves. The related
jettison nozzle valve also opens. The jettison time is initially estimated using
preprogrammed rates. The system begins updating the estimate based on actual
fuel quantity rate of change ninety seconds after jettison begins.
If override/jettison pumps 2 and 3 are providing fuel to the engines when jettison begins, the EICAS message FUEL OVRD may be displayed due to reduced
pressure caused by the jettison nozzles valves opening. Jettison is verified by
observing decreasing tank quantities.
The jettison control system controls fuel balancing between main tanks 2 and 3 as
fuel is jettisoned. If fuel balancing is necessary, the override/jettison pumps in the low tank deactivate until the tanks are balanced.
The FSMCs open the reserve transfer valves when main tank 2 or 3 fuel quantity decreases to 18,140 kilograms. Fuel transfers from reserve tanks 2 and 3 to the related main tank.
When either main tank 2 or 3 fuel quantity decreases to 9,072 kilograms during jettison, both main tank 1 and 4 transfer valves open.
Jettison terminates when total fuel quantity decreases to the fuel to remain
quantity. The fuel to remain quantity indication changes color from magenta to
white and flashes for five seconds. The jettison control system deactivates all
operating override/jettison and transfer/jettison pumps. The related FUEL OVRD pump EICAS messages display until the Fuel Jettison selector is OFF.

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CLICK 👉 Exterior Inspection

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CLICK 👉 Flight Envelope Protection

CLICK 👉 Audio Panels

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CLICK 👉 Electrical Load Management and Load Shedding

CLICK 👉 AC Electrical System Power Sources

CLICK 👉 Integrated Drive Generators (IDGs)

CLICK 👉 Auxiliary Power (External and APU)

CLICK 👉 AC Main Busses

CLICK 👉 Electrical bus Isolation during Autoland

CLICK 👉 AC Standby Power System

CLICK 👉 Main DC Electrical System

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CLICK 👉 Battery Busses

CLICK 👉 Compact Display Format

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CLICK 👉 Electronic Engine Control (EEC)

CLICK 👉 Engine Start and Ignition System

CLICK 👉 Engine Fuel System

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CLICK 👉 Cargo Compartment Fire Detection

CLICK 👉 Fire and Overheat Detection System Automatic Fault Test

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CLICK 👉 Squib Test

CLICK 👉 Elevator Control

CLICK 👉 Stabilizer Trim

CLICK 👉 Trim Control

CLICK 👉 Stabilizer Trim Position Indication and Greenband

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CLICK 👉 Trimming with Autopilots Engaged

CLICK 👉 Aileron and Spoiler Roll Control

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CLICK 👉 Flight Management Computer

CLICK 👉 Actual Navigation Performance

CLICK 👉 Required Navigation Performance

CLICK 👉 Manually Entered Airway Crossing Waypoints

CLICK 👉 Speed/Altitude Constraints

CLICK 👉 Fuel Monitoring

CLICK 👉 Loss of FMC Electrical Power

CLICK 👉 Single FMC Failure

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CLICK 👉 Alternate Navigation Waypoints

CLICK 👉 Alternate Lateral Navigation

CLICK 👉 Alternate Navigation Radio Tuning

CLICK 👉 Alternate Navigation CDU Pages

CLICK 👉 Fuel System Description

CLICK 👉 Fuel Quantity

CLICK 👉 Fuel Temperature

CLICK 👉 Fuel Pumps

CLICK 👉 Fuel Crossfeed

CLICK 👉 Main Tank 1 and 4Transfer

CLICK 👉 APU Fuel Feed

CLICK 👉 Operation With Fuel in Center Wing Tank

CLICK 👉 Operation With No Fuel in Center Wing Tank

CLICK 👉 Fuel Jettison

CLICK 👉 Hydraulic Systems

CLICK 👉 Fluid Supply

CLICK 👉 Load Assignments

CLICK 👉 Landing Gear System Description

CLICK 👉 Air/Ground Sensing System

CLICK 👉 Landing Gear Operation

CLICK 👉 Landing Gear Retraction

CLICK 👉 Landing Gear Extension

CLICK 👉 Landing Gear Alternate Extension

CLICK 👉 Nose Wheel and Body Gear Steering

CLICK 👉 Brake Torque Limiter

CLICK 👉 Rejected Takeoff

CLICK 👉 Parking Brake

CLICK 👉 Engine Indication and Crew Alerting System (EICAS)

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