How can warm or cold

air get in the cabin?

Cold air from ACM is mixed

with cabin re-circulating air

What is the major

component of a ECU?

Air cycle machine

In what order is bleed air

routed to the cabin?

1) From engines to pylon precoolers

2) ECU

3) Further cooled through ACM

4) Ducted into cabin outlets

How does the ACM

get its power?

Bleed air

What is the purpose of

the cabin recirculating fans?

Increase air movement

through the wemacs

On what bus is

the temperature control

selector?

Emer bus

What is in a ECU?

2 heat exchangers

ACM

Water separator

ACM overtemp switch

What should you do when duct o'temp cockpit is displayed?

Select cooler cockpit temperature

What valves does the

engine bleed air knobs

move in the off position?

Bleed air valves prior to precoolers

What systems are found on

the left engine bleed air

not found on the right side?

Emer press

Baggage heat

What systems are not

found on the pressure

source knob?

Anti-ice

What valves does the pressure source knob move

in the off position?

Mass flow valves

What systems does the pressure

source knob control?

a) Environmental

b) Pressurization

c) Emer press

d) Baggage heat

What systems are on

the right knob?

(air conditioning)

a) Anti-ice

b) Environment

c) Pressurization

d) Service air

What system is not

on the right knob?

Baggage heat

How do you get

incoming air in emer?

Mass flow fail open

What do you use to get

outgoing air in emer?

In manual mode, using

the cherry picker

What is the NACA scoop

by the ACM exhaust?

Keeps tailcone pressurized

How do you get hot

air in the cabin?

Mix recycled warm air

over cold air from ACM

What valves control the

air going to the ACM?

Left and Right mass flow valves

APU BCV

On what bus is cabin

temperature rheostat?

Main DC in auto

Emer in manual

How long does the TCV

go from cold to hot?

10 seconds

Is it allowed to set HP with the engine bleed knob to heat

the cabin below FL 370?

Yes you can,

if fuel consumption allow

What valves does the

temperature select move?

TCV's

Why is the APU needs to be

off to do the bleed air test?

ITT would not decrease

Engine would not have to "work"

Bleed air test: What happens

when you turn the left

engine bleed air knob?

a) Shutoff Left bleed air valve

b) Left ITT decrease

Bleed air test: what happens when you turn the right engine bleed air knob to the off position?

                   a) Shut off the right bleed air valve

b) Right ITT decrease

Bleed air test: What happens

when you turn the press

source knob off?

a) Both mass flow valve close

(less demand on both engines)

b) Both ITT decrease

Bleed air test: what happens

  when you turn the press

source knob to emer?

a) Emer press valve opens

b) Left mass flow remains closed

c) Left ITT decrease

Bleed air test: what happens

when you turn the press

source knob to the left?

a) Left mass flow opens

b) Emer press closes

c) Small decrease in ITT

d) small decrease in noise

Bleed air test: what happens

when you turn the press

source know to the right?

a) Right mass flow opens, left side close

b) Left ITT decrease, right ITT increase

Bleed air test: what happens

when you turn the press

source knob back to norm?

a) Both mass flow open

b) Left ITT increase

Why does the APU bleed air

does not pass through a precooler?

Because its normal temperature is

below 476F and does not require cooling

Where are the two temperature sensors for the cockpit and cabin control system located?

Cockpit: left side panel behind CB panel

Cabin: In the aft recirculation duct,

just behind the most rear left seat

When do you get bleed air from the left engine to enter the cabin under the floor to maintain pressurization?

When the PRESS SOURCE SELECTOR

knob is selected to EMER

When EMER PRESS activates

True or false: with the CKPT or CABIN TEMP

knob in the manual position, the digital

temperature selection (SEL) is disabled

True

True or false: hot or cold air from the ECU

is routed through the wemacs to

individual seat locations

False