What systems require

bleed air for operation?

Service air

Icing protection

Air conditioning

Pressurization

Baggage heat

What systems use the bleed

air through the precoolers

in each engine pylon?

a) Environment

b) Wing anti-ice

c) Stab anti-ice

d) Service air

What bleed air system

doesn't use precooled air?

Engine anti-ice

Rudder bias actuator

Where is the engine bleed

air coming from?

High pressure and low pressure

compressor stages

What does the norm position

on the engine bleed air

control panel do?

Provides either LP or HP bleed air

based on throttle position schedule

When does HP come

automatically with

the switch on norm?

a) Throttle lever angle (TLA)

b) Engine anti-ice on over FL 250 or with X-flow selected

c) Single engine

d) Emer press active

e) Loss of TLA position

f) Above FL 370

Why is there a need to

sequence HP or LP bleed air?

Limits bleed air temperature and

pressure to the precoolers

Maintain engine performance

What systems use service air?

 Acoustic door seal

Vacuum ejector on outflow valves

Rudder bias heater

Which throttle will cause the acoustic seal to deflate?

Left throttle to cutoff

What does the bleed air

detection system provide?

Detects overtemp in tail cone, engine pylons,

and anti-ice systems

What are the 6 zones of

the bleed air detection system?

a) Wing anti-ice L&R

b) Bleed supply L&R

c) Tail anti-ice

d) ACM

What are the 3 elements to

make a bleed air leak

detection zone?

1) Eutectic salt sensing lines

2) Controller

3) Printed circuit board (PCB)

How does eutectic

salt work?

At a set temperature, salt melt, altering the resistance in the line

Controller sends a signal to the PCB

Which then automatically shuts off bleed air in the affected zone

How can you test the

bleed leak detection system?

Rotary test

Are the mass flow valves usually

open or closed and in

what position do they fail?

 Powered close and fail open

Where is the heat for

the baggage compartment

coming from?

Bleed air from left mass flow valve

What kind of bleed air

do the ACM use?

Both HP or LP

What happens when

stab bleed leak

message appears?

Both stabilizer anti-ice valve

close simultaneously

What happens when a pylon

zone develops a bleed

air leak?

a) Bleed air shutoff closes (pylon)

b) Respective wing and stabilizer

anti-ice SOV closes

From which compressor

 stage is LP discharged?

LP come from P2.5 (axial stages)

From which compressor

stage is HP discharged?

HP come from P3

(last compressor stage)

How does the HP valves fail

with loss of DC?

Fail open

How does a pilot controls

HP or LP?

a) Automatically via throttle position

b) Manually via the control panel

on the copilot side

Where does the bleed air

bypassing the precoolers go to?

 Engine anti-ice

Rudder bias actuator

At what temperature is the

bagage compartment heated?

On and off between 70-100F

(21-38C)

At what temperature will

bag heat fail

message display?

165F

What does a mass flow

valve do?

Controls bleed air to the ACM

What can APU

bleed air do?

ACM

Service air

Can you affect engine anti-ice

by switching the engine

bleed air knob?

No

What happens when you

move the pressure source

selector to off?

Close the mass flow valves

If both closed, airplane will depressurize

unless APU bleed air is on

Can you use HP and LP

at the same time?

Check valves prevent it

What is the only procedure requesting both bleed

air knob in the off position?

 Ditching

Makes it easier to open the cabin door

What does a bleed air

o'temp mean in general?

Problem with the precoolers

How can you still have anti-ice

on the side of the engine

with the bleed air knob off?

X-flow switch

What valves move with

 pressure source knobs?

Controls L and R mass flow valves

And emer press valves

What activates emer

pressurization?

a) Manual activation

b) ACM o'temp

c) ACM bleed leak

d) Cabin over 14500 feet

What is the purpose

of the ACM?

Make cold air at 5C

When does the baggage

heat come available?

When selected

After takeoff to after landing 

(WOW)

When does the

baggage heat fail

message appears?

Bleed air SOV has failed open

when commanded to be closed

When do you get this message: baggage heat fail?

Valve failed closed when

commanded to be open

When will the baggage

heat not come on?

a) overtemp

b) Baggage heat fail

c) Landing

d) Baggage fire

e) Fire bottle low message

When will the acoustic

seal inflate?

Door closed and left throttle out of cutoff

(service air must be available)

Will the seal remain inflated

in flight with left

engine shutdown?

Yes

When does the baggage

heat turns off automatically?

 a) WOW

b) 100F

c) 165F

d) Any CAS fire

Where does service air

come from?

Any of three engines

What systems are not

monitored for bleed leak?

a) Service air

b) Rudder bias

What are 2 bleed air system

 used by the rudder bias?

a) Service air for the heater

b) Bypassed precooler for actuator

Why is service air used to heat

the rudder bias heater, when

it is actually colder than

the bypassed air from the precoolers?

Not really needed, but is there to dry the moisture and avoid freezing on the actuator for high altitude cold temperatures

What are the bleed air

limitations above FL410?

a) All selectors to norm

b) Both bleed air source must be available

Why does emer press

activates with a

ACM bleed leak message?

Because system logic closes the

mass flow valves and APU BCV valve

Why is service air used

in the ACM?

To create a vacuum to remove

water from the water separator

If you were to draw the pneumatic system, which valves would you find first between the engines and the precooler?

1) LP and HP bleed air valves

2) Bld air valves

If you were to draw the pneumatic system, what valves would you find between the precooler and the ACM?

1) Mass flow control valves

2) On the left side, you would also find

separate lines going to baggage heat

valve and emer press valve

3) On the right side, you would also find a separate line to APU bcv

True or false: STAB BLEED LEAK

will extinguish once the appropriate

sensor has cooled

False. The message will remain

What is the function of ENG BLD AIR

knob in the NORM position?

Automatic logic for HP vs LP is enabled

What are the two sensors

in the baggage compartment?

One measures the recirculating air

The other measures overtemp

What is the risk if the pressure source selector is not in norm above FL 410?

Emer press will no longer come automatically