Air Management

Question 1

When would you need to use LFE Control?

Answer 1

When dual FMS Failure or

Airport is not in FMS Database.

Question 2

Will System Pressurize automatically in LFE Ctrl mode?

Answer 2

Yes

Question 3

In Flight - what will happen if DUMP button is pressed ?

Auto and Manual

Answer 3

Both- Packs and Recirc Fans will Turn off

In addition in
Auto - Outflow Valve will modulate to Raise the Cabin to 12,400 feet at 2,000 fpm.
Then Natural leak will continue raising Cabin alt to current altitude.

Question 4

In Flight- Level at 11,000ft
How high will Cabin climb if you Press
Dump Button?

What if you were at 35,000 feet?

Answer 4

11,000- outflow valve will modulate to 11,000 feet at 2,000 ft per min.

35,000- outflow valve will modulate to 12,400 ft at 2,000 ft per min and then naturally leak until reaching 35,000 feet.

Question 5

What 2 system components are turned off when you push in the Dump Button?

Answer 5

Both Packs and the Recirc Fans

Question 6

On Ground- 1 Engine Taxi

What Bleed is Prioritized for Starting Engine #2?

Answer 6

APU Bleed

Question 7

On the Ground with the APU and Both Engines Operating:

Which Pneumatic sources has priority for Supplying bleed air to the packs?

Answer 7

The respective Engines ( Onside )

Question 8

In Flight- What is the Bleed Priority of the AMS

Answer 8

Onside
OtherSide
Inside

(Outside)

Question 9

In Flight
What Bleed Source is prioritized for Pack 1?

If not available what is next priority for Pack 1?

Answer 9

Engine 1 Bleed ( Onside )

If not available Engine 2 Bleed ( OtherSide)

Question 10

In Flight
What happens if you push out Bleed 1 ( push button )?

Would pack 1 Turn off? Why?

Answer 10

Closes Bleed Valve of Engine 1

No, because XBleed valve would auto open and Bleed 2 would supply both Packs.

( In icing conditions Pack 1 would Turn off to ensure adequate air to A/I system. )

Question 11

What does Ambar Bar in Bleed 1 Push Button Indicate?

Answer 11

Bleed Leak

Question 12

If Smoke is Detected in Recirc Bay

What components are affected in AC/Pneumatic Panel?

Answer 12

Recirc Fans are commanded off ( bar would illuminate )

Question 13

When are Pack 1 and Pack 2 Commanded off?

Answer 13

• Pressing Dump Button
• Thrust Levers are Set to Max
• During Takeoff with REF ACS OFF selected and APU Bleed unavailable.

Question 14

MCDU: REF ECS- OFF
APU: OFF

 Will the pack valves be OPEN for Take off?

Answer 14

No

Question 15

MCDU: REF ECS- OFF
APU: ON

 Will the pack valves be OPEN for Take off?

Answer 15

Yes

Question 16

During Takeoff you encounter WINDSHEAR. After Selecting Max Power what happens to the Packs?

Answer 16

There are commanded off.

this in turn Commands the Recirc Fans off also

Question 17

With MaX power Selected

What Components in the Pneumatics Panel are affected?

Answer 17

Packs are commanded off and associated Recirc fans in turn are commanded off.

Question 18

What is an Indication of APU Bleed Leak?

Answer 18

Amber Bar light in upper half of APU Bleed Push Button.

Along with an EICAS message.

Question 19

What Conditions Command the Recirc Fans off?

Answer 19

Thrust set to Max Power

• Associated Pack Commanded Off
• Dump button pushed in
• Smoke detected in Recirculation bay