Environmental Control System

Question 0

RAM AIR Ventilation is used only when:

Answer 0

When both packs have failed

Question 1

The right-hand pack normally supplies:

Answer 1

Passenger cabin

Question 2

Flight compartment exhaust air in flight is routed through the:

Answer 2

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

Question 3

Cabin air outflow is controlled automatically by:

Answer 3

The active CPC maintains aircraft pressurization

Question 4

The pressurization system automatically pre-pressurizes the aircraft to:

Answer 4

-150 feet

Question 5

Maximum negative differential pressure is:

Answer 5

-0.5 psi

Question 6

If the cabin altitude reaches 14,000 feet the:

Answer 6

CPAM will trigger the oxygen system auto deploy to the passengers

Question 7

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

Answer 7

GND fan/FLT ALT fan

Question 8

When the press cont switch/light is pressed in:

Answer 8

It selects manual mode

Question 9

The manual cabin altitude regulator, when selected UP:

Answer 9

Causes outflow valves to open and increase cabin altitude

Question 10

The Manual (MAN) pressurization readouts are displayed on:

Answer 10

EICAS primary page

Question 11

“Cabin pressure” aural warning will be heard when:

Answer 11

Cabin altitude is greater than 10,000 feet

Question 12

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

Answer 12

Provide overpressure and negative pressure relief

Question 13

During ground operations the ground valve:

Answer 13

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

Question 14

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

Answer 14

6th or 10th stage

Question 15

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

Answer 15

Yes, under the floor via dedicated exhaust systems.

Question 16

How many smoke detector units are in each cargo bay?

Answer 16

3 frwd

2 aft

Question 17

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

Answer 17

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

Question 18

Three uses for RAM air inlet?

Answer 18

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

Question 19

How is bleed air conditioned?

Answer 19

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.

Question 20

How is Ram air used in relation to the PACKs?

Answer 20

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

Question 21

Left hand pack normally supplies conditioned air to?

Answer 21

Flight Deck

Question 22

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

Answer 22

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

Question 23

What controls the pressurization? How many?

Answer 23

Cabin pressure controllers (CPC)

There are 2

Question 24

What moves the outflow valve ?

Answer 24

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

Question 25

On the CABIN PRESSURE panel,

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

Answer 25

The amber FAULT means that both CPCs have failed.

Question 29

Where does recirculation air come from ?

Answer 29

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

Question 30

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

Answer 30

10 minutes. In case of air return