B744 ENGINE BLEED AIR

Question 1

What would cause a Fault light to illuminate?

Answer 1

• Bleed Air overheat
• Bleed Air overpressure
• HP Bleed or PRV valves Open when commanded Closed

Question 2

When I place the Engine Bleed Air switch to OFF, what 3 valves close?

Answer 2

• Engine Bleed Air valve
• PRV
• HP Bleed Air valve

Question 3

Do I still have NAI & Thrust reversing with the Engine Bleed Air switch OFF?

Answer 3

Yes, unless the PRV is commanded Closed by:

• Start Valve Open,
• Bleed Air overheat,
• HP valve failed Open

Question 4

Bleed Duct Leak L: how many switches will be involved?

Answer 4

5 or 6;
Ø Left Isolation Valve
Ø Engine Bleed switches 1 & 2 
Ø #1 Pack Control Selector
Ø #1 Demand Pump switch
Ø WAI switch (if in use)

Question 5

Bleed Duct Leak L: what should be considered when configuring the airplane?

Answer 5

Left LE will operate in Secondary mode )
Primary Flaps EICAS message
Slight asymmetry

Question 6

Bleed Duct Leak L: what should be considered if the aircraft has to be towed in?

Answer 6

Do not shutdown Eng #1 during tow in for Hydraulics (steering)