Air Conditioning

Question 1

True or False: The air conditioning system is controlled using the AIR
COND/PNEUMATIC panel located on the overhead panel.

Answer 1

True

Question 2

Under normal conditions, air from which pack is delivered directly to the flight
Deck?

Answer 2

Pack 1

Question 3

True or False: The air conditioning packs are located in the wing to fuselage
Fairings.

Answer 3

True

Question 4

What is the purpose of the air conditioning packs?

Answer 4

The packs cool the bleed air before delivering it to the mixing manifold.

Question 5

True or False: During single engine operations, a single engine will not be able to
supply both packs with bleed air.

Answer 5

False (2.16 Vol 2)

Question 6

True or False: A single pack can supply sufficient conditioned air for the entire
Aircraft.

Answer 6

True

Question 7

When a single pack fails, which of the following will be the result?

Answer 7

An EICAS message will be displayed

The temp selector knob for the failed pack will have no effect on the temp of the disabled pack zone.

Question 8

In order to set the target temperature from the overhead panel for the air
conditioning, you would do what?

Answer 8

Rotate the temperature knob for each pack

(Make slight changes, wait 10 minutes.)

Question 9

Where is the pack status displayed?

Answer 9

ECS page of each pilots MFD synoptic page

Question 10

During cruise, how much time should be allowed in between corrections of the
temperature control knobs?

Answer 10

10 min.

Question 11

Which part of the air conditioning system is responsible for making sure that all
areas receive conditioned air even if a pack is disabled?

Answer 11

Mixing manifold

Question 12

How many recirculation fans are there?

Answer 12

2

Question 13

At which temperature will the gasper shutoff valve open?

Answer 13

Exceeding 95 degree Fahrenheit

Question 14

Manually selected temperatures for the air conditioning system are displayed where?

Answer 14

ECS synoptic page of each pilots MFD

Question 15

How can the PAX cabin temperature control be transferred from the flightdeck to
the cabin?

Answer 15

Rotating the PAX CABIN knob to the ATTND position

Question 16

Where are the fans drawing air from in order to cool the FWD E-BAY?

Answer 16

From the flightdeck

Question 17

How does the forward E-BAY air cooling system monitor its temperature?

Answer 17

A flow sensor is used to monitor the fan/flow health

Question 18

What will occur if the forward E-BAY fans fail?

Answer 18

The EICAS message “FWD E-BAY FANS FAIL” is displayed

Question 19

The flightdeck Ram Air Valve is commanded to open when _______.

Answer 19

Both ECS packs commanded OFF or failed
and
Aircraft altitude is less than 25,000 ft

Question 20

True or False: During normal operations, air from Pack 1 is delivered directly to the
flight deck.

Answer 20

True

Question 21

True or False: There are two fans installed in the aft electronic bays for cooling.

Answer 21

False

Question 22

Which of the following apply during a smoke removal situation?

Answer 22

Both packs are commanded OFF

[The flightdeck emergency ram air ventilation valve is automatically commanded open]

Question 23

The gasper air distribution system provides air to _______.

Answer 23

Each pilot and passenger position

Question 24

True or False: A single bleed air consumer can receive bleed air from multiple sources at the same time.

Answer 24

False
(2.12 Vol 2 “It is not possible to have both the APU and the engines as bleed sources simultaneously”)