Environmental Control System Flashcards Preview

CRJ 700/900Electrical > Environmental Control System > Flashcards

Flashcards in Environmental Control System Deck (28)
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0
Q

RAM AIR Ventilation is used only when:

A

When both packs have failed

1
Q

The right-hand pack normally supplies:

A

Passenger cabin

2
Q

Flight compartment exhaust air in flight is routed through the:

A

Under floor through the avionics bay to outflow valve at aft press bulkhead

3
Q

Cabin air outflow is controlled automatically by:

A

The active CPC maintains aircraft pressurization

4
Q

The pressurization system automatically pre-pressurizes the aircraft to:

A

-150 feet

5
Q

Maximum negative differential pressure is:

A

-0.5 psi

6
Q

If the cabin altitude reaches 14,000 feet the:

A

CPAM will trigger the oxygen system auto deploy to the passengers

7
Q

On the ground, with Display Control Panel in “normal” what fan cools the cockpit displays?

A

GND fan/FLT ALT fan

8
Q

When the press cont switch/light is pressed in:

A

It selects manual mode

9
Q

The manual cabin altitude regulator, when selected UP:

A

Causes outflow valves to open and increase cabin altitude

10
Q

The Manual (MAN) pressurization readouts are displayed on:

A

EICAS primary page

11
Q

“Cabin pressure” aural warning will be heard when:

A

Cabin altitude is greater than 10,000 feet

12
Q

The two safety valves located on the aft pressure bulkhead do what?

A

Provide overpressure and negative pressure relief

13
Q

During ground operations the ground valve:

A

Is used to cool avionics and forward CRT’s and equipment

14
Q

What is the normal source for engine supply bleed air to the manifold?

A

6th or 10th stage

15
Q

Is the air in the lavatory and galley exhausted? If so, where does it go?

A

Yes, under the floor via dedicated exhaust systems.

16
Q

How many smoke detector units are in each cargo bay?

A

3 frwd

2 aft

17
Q

If smoke is detected by at least 2 of the 3 smoke detectors in a cargo bay, what happens?

A

The optional heater is shutdown and the intake and exhaust shutoff valves are closed.

18
Q

Three uses for RAM air inlet?

A

1) heat exchanger for Air conditioning pack
2) heat exchanger for hydraulic systems 1/2
3) RAM air ventilation (cabin) if unpressurized.

19
Q

How is bleed air conditioned?

A

First sent through a pre-cooler. If hot air is needed it will go to the cabin, if colder air is needed it will be cycled through the ACM until desired temperature.

20
Q

How is Ram air used in relation to the PACKs?

A

It provides movement of air through the packs and helps cool down bleed air in the heat exchangers.

21
Q

Left hand pack normally supplies conditioned air to?

A

Flight Deck

22
Q

On the Air Conditioning panel, on the switch light that reads fault/off, What does the “fault” amber light mean?

A

A PACK has had an over pressure or over temp. That pack is shutoff.

23
Q

What controls the pressurization? How many?

A

Cabin pressure controllers (CPC)

There are 2

24
Q

What moves the outflow valve ?

A

Three independent motors. Two automatically by the CPCs and one is manual.

25
Q

On the CABIN PRESSURE panel,

What does the amber “fault” mean on the FAULT/MAN switch-light?

A

The amber FAULT means that both CPCs have failed.

29
Q

Where does recirculation air come from ?

A

Sucks air up from floor and moves it to the top vents.

30
Q

How long will the px controller hold the take off field altitude ?

A

10 minutes. In case of air return