Boeing 747 Engine Bleed Air Supply boeing 747 pilot training course

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BOEING 747 FULL PILOT TRAINING COURSE STEP BY STEP 


Engine Bleed Air Supply
Engine bleed air is supplied from either intermediate pressure (IP) or high pressure (HP) engine sections. IP air is used during high power setting operations. HP air is used during descent and other low power setting operations.
To prevent damage to ducting and equipment downstream, the pressure regulating valve (PRV) limits bleed air pressure. The fan air precooler regulates bleed air temperature.
With an Engine Bleed Air switch ON, system logic allows bleed air to open the
HP bleed valve and the PRV and allows bleed air to open the respective engine
bleed air valve and flow into the bleed air duct.. The bleed air valves are pressure
actuated and remain closed until engine bleed air pressure causes forward flow.
The engine bleed air valve regulates the engine bleed air to provide normal bleed
air system pressure. It also prevents reverse flow of bleed air from the duct, except during the engine start sequence. When air pressure in the bleed air duct fro another source (APU, ground air cart, another engine) is higher than the bleed air from an engine, the engine bleed air valve closes to prevent reverse flow.
During engine start, the engine bleed air valve opens and allows reverse flow of
air from the bleed air duct to open the start valve. The PRV is positively closed to
prevent reverse air flow into the engine compressor sections. Any time the engine
start valve is not fully closed, the PRV remains positively closed. After N2
increases past 50%, the start valve closes which enables the PRV to open and the
engine bleed air valve reverse flow prevention is enabled.
If the engine start valve fails to close, bleed air is isolated from the engine starter because both the PRV and the engine bleed air valve remain closed. Nacelle anti-ice is not available for the respective engine.
If an Engine Bleed Air switch is off, the respective engine bleed air valve, PRV,
and HP bleed valve are closed.
If a bleed air overheat is detected, the PRV and HP bleed valves close. Pushing an
Engine Bleed Air switch from off to ON resets the engine bleed fault detection
system.
Bleed air is available for nacelle anti-ice operation with the Engine Bleed Air
switch ON except when:
• the PRV has failed closed, or
• the PRV has been closed due a bleed air overheat, or
• the start valve is not closed
Bleed air is available for nacelle anti-ice operation with the Engine Bleed Air
switch off except when:
• the PRV has failed closed, or
• the PRV has been closed due a bleed air overheat, or
• the start valve is not closed, or
• the HP bleed valve is failed open
Bleed air is available for thrust reverser operation with the Engine Bleed Air
switch either ON or off except when:
• the PRV has failed closed, or
• the PRV has been closed due a bleed air overheat, or
• the start valve is not closed

CLICK 👉 BOEING 747 TRAINING MANUAL BOOK 

CLICK 👉 BOEING 747 CHECKLIST

CLICK 👉 Exterior Inspection

CLICK 👉 Preflight Procedure – First Officer

CLICK 👉 Preflight Procedure – Captain

CLICK 👉 Before Start Procedure

CLICK 👉 After Landing Procedure

CLICK 👉 Shutdown Procedure

CLICK 👉 Secure Procedure

CLICK 👉 Revision Highlights

CLICK 👉 Operating Instructions

CLICK 👉 Operations Manual Information

CLICK 👉 Autopilot Flight Director System and Flight

CLICK 👉 CDU Operation

CLICK 👉 Lighting Systems

CLICK 👉 Flight Deck Lighting

CLICK 👉 Cabin Signs

CLICK 👉 Emergency Lighting

CLICK 👉 Oxygen Systems

CLICK 👉 Flight Crew Oxygen System

CLICK 👉 Passenger Oxygen System

CLICK 👉 Portable Oxygen Bottles

CLICK 👉 Miscellaneous Emergency Equipment

CLICK 👉 Emergency Locator Transmitters (ELTs)

CLICK 👉 Flight Deck Door

CLICK 👉 Passenger Entry Doors

CLICK 👉 Passenger Entry Door 1, 2, 4, and 5 Slide/Raft Operation

CLICK 👉 Securing Main Deck Doors 1, 2, 4, or 5 In The Open Position

CLICK 👉 Passenger Door 3

CLICK 👉 Upper Deck Doors

CLICK 👉 Flight Deck Overhead Hatch

CLICK 👉 Emergency Escape Devices

CLICK 👉 Cargo Doors

CLICK 👉 Door 5 Overhead Crew Rest

CLICK 👉 Evacuation Using Emergency Escape Hatch

CLICK 👉 Air Conditioning System Description

CLICK 👉 Air Conditioning Packs

CLICK 👉 Pack Non–Normal Operation

CLICK 👉 Air Distribution

CLICK 👉 Lavatory and Galley Ventilation

CLICK 👉 Temperature Control

CLICK 👉 Zone Target Temperatures

CLICK 👉 Temperature Control With Loss of Trim Air System

CLICK 👉 Temperature Control Non-Normal Operations

CLICK 👉 Cargo Heat

CLICK 👉 Pilot Auxiliary Heat

CLICK 👉 Equipment Cooling

CLICK 👉 Equipment Cooling Non-Normal Operation

CLICK 👉 Pressurization System Description

CLICK 👉 Pressurization System Automatic Operation

CLICK 👉 Pressurization System Manual Operation

CLICK 👉 Pressurization Relief

CLICK 👉 Engine Bleed Air Supply

CLICK 👉 APU Bleed Air Supply

CLICK 👉 Ground Bleed Air Supply

CLICK 👉 Bleed Air Duct System

CLICK 👉 Duct Leak and Overheat Detection System

CLICK 👉 Bleed Air System Non-normal Operations

CLICK 👉 Automatic Ice Detection System

CLICK 👉 Nacelle Anti–Ice System

CLICK 👉 Nacelle Anti–Ice System Automatic Operation

CLICK 👉 Nacelle Anti–Ice System Manual Operation

CLICK 👉 Nacelle Anti-Ice Non-normal Operation

CLICK 👉 Wing Anti–Ice System

CLICK 👉 Wing Anti–Ice System Automatic Operation

CLICK 👉 Wing Anti–Ice System Manual Operation

CLICK 👉 Flight Deck Window Heat

CLICK 👉 Windshield Air

CLICK 👉 Windshield Wipers and Washers

CLICK 👉 Probe Heat

CLICK 👉 Autopilot Disengagement

CLICK 👉 AFDS Failures

CLICK 👉 Flight Director Display

CLICK 👉 AFDS Flight Mode Annunciations

CLICK 👉 Autothrottle Modes

CLICK 👉 Autothrottle Thrust Lever Operation

CLICK 👉 Autothrottle Disconnect

CLICK 👉 Automatic Flight - Cruise

CLICK 👉 Automatic Flight - Approach and Landing

CLICK 👉 Runway Alignment and Asymmetric Thrust Compensation

CLICK 👉 Automatic Flight - Go–Around

CLICK 👉 Automatic Flight Windshear Recovery

CLICK 👉 Flight Envelope Protection

CLICK 👉 Audio Panels

CLICK 👉 Cockpit Voice Recorder System

CLICK 👉 Radio Tuning Panels

CLICK 👉 Radio Communication System

CLICK 👉 Interphone Communication System

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

CLICK 👉 Main DC Power Distribution

CLICK 👉 Battery Busses

CLICK 👉 Compact Display Format

CLICK 👉 Partial Display Format

CLICK 👉 Electronic Engine Control (EEC)

CLICK 👉 Engine Start and Ignition System

CLICK 👉 Engine Fuel System

CLICK 👉 Engine Oil System

CLICK 👉 Thrust Reverser System

CLICK 👉 Airborne Vibration Monitoring System

CLICK 👉 Fire Warnings

CLICK 👉 Engine Fire/Overheat Detection

CLICK 👉 APU Fire/Overheat Detection

CLICK 👉 Cargo Compartment Fire Detection

CLICK 👉 Fire and Overheat Detection System Automatic Fault Test

CLICK 👉 Fire and Overheat Detection System Manual Fault Test

CLICK 👉 Squib Test

CLICK 👉 Elevator Control

CLICK 👉 Stabilizer Trim

CLICK 👉 Trim Control

CLICK 👉 Stabilizer Trim Position Indication and Greenband

CLICK 👉 Stabilizer Trim Cutout

CLICK 👉 Trimming with Autopilots Engaged

CLICK 👉 Aileron and Spoiler Roll Control

CLICK 👉 Aileron Trim

CLICK 👉 Rudder Control and Trim

CLICK 👉 Rudder Ratio Changers

CLICK 👉 Yaw Dampers

CLICK 👉 Spoilers

CLICK 👉 Speed Brakes

CLICK 👉 Ground Spoilers

CLICK 👉 Flaps

CLICK 👉 Flap Control

CLICK 👉 Flap Sequencing

CLICK 👉 Flap Load Relief

CLICK 👉 Flap Indications

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

CLICK 👉 Dual FMC Failure

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)

CLICK 👉 Traffic Advisories (TA) and Display

CLICK 👉 Proximate Traffic Display

CLICK 👉 Other Traffic Display

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