Pneumatic

Question 1

The pneumatic system supplies high-pressure air for :

Answer 1

‐ Air conditioning ‐ Engine starting ‐ Wing anti-icing ‐ Water pressurization ‐ Hydraulic reservoir pressurization ‐ FWD cargo heating ‐ AFT cargo heating ‐ Fuel Tank Inerting System (FTIS)

Question 2

High-pressure air has three sources :

Answer 2

‐ Engine bleed systems ‐ APU load compressor ‐ HP ground connection

Question 3

the operation of the pneumatic system is controlled and monitored by:

Answer 3

Two Bleed Monitoring Computers (BMC1 and BMC2), the overhead control panel, and the ECAM

Question 4

The aircraft has two similar engine bleed air systems. Each system is designed to :

Answer 4

‐ select the compressor stage to use as a source of air ‐ regulate the bleed air temperature ‐ regulate the bleed air pressure

Question 5

The HP valve closes automatically: ‐ Pneumatically:

Answer 5

• In case of low upstream pressure • In case of excessive upstream pressure ‐ Electrically when the bleed valve is closed electrically.

Question 6

Air is normally bled from the ____________ pressure stage of engine’s compressor to minimize

Answer 6

intermediate (IP) / high-pressure (HP) / fuel penalty

Question 7

The bleed valve is fully closed: ‐ Pneumatically: ___________________________‐ Electrically by means of:_______________

Answer 7

• If upstream pressure goes below 15 PSI • If there is return flow / • The BLEED pushbutton switch (switched OFF) • The ENG FIRE pushbutton (pushed) • The Bleed air Monitoring Computer (BMC) in some cases

Question 8

The Bleed air Monitoring Computer (BMC) in the following cases:

Answer 8

‐ Overtemperature ‐ Overpressure ‐ Leak ‐ Open starter valve ‐ Engine shutdown ‐ APU bleed being ON ‐ No bleed consumers ‐ HPV failed open ‐ Bleed temperature lost ‐ Fan duct burst detected by the FADEC

Question 9

The APU BLEED pb-sw, on the AIR COND panel, controls the APU bleed valve. When the flight crew selects ON with the pushbutton,

Answer 9

APU bleed air supplies the pneumatic system, if the APU speed is above 95 %

Question 10

Bleed valve opens if :

Answer 10

‐ Upstream pressure is above 15 PSI. ‐ APU BLEED pb-sw is off or APU bleed valve is closed. ‐ There is no onside wing or pylon leak, and no overpressure or overtemperature has been detected. ‐ The ENG FIRE pb has not been popped out. ‐ The engine start valve is closed. ‐ At least one bleed consumer (Pack or WAI) is ON on the same side or at least one bleed consumer is ON on the opposite side with the crossbleed valve is open.

Question 11

APU BLEED pb sw ON : The APU valve opens if

Answer 11

N > 95 % and there is no leak in the APU or in the left side bleed. (If there is a leak on the right side, the x-bleed valve closes.) The blue ON light comes on