Pneumatics and Oxygen

Question 1

An external air connection enters through the right side of the bleed manifold. How is it introduced to the left manifold?

Answer 1

By opening the isolation valve

Question 2

What is the corrective action for a red “L PYLON HOT” CAS

Answer 2

Turn off the left engine bleed air switch and the left pack

Question 3

The corrective action for a red “AFT EQUIP HOT” CAS

Answer 3

Determine which side has a possible bleed air leak (high TGT and fuel flow), and turn off the affected engine bleed air switch and air conditioning pack switch.

Question 4

The minimum pressure and temperature set points of the bleed air systems

Answer 4

Normal - 14 PSI
Low power - 22 PSI
Single Pack - 35 PSI
Wing AI ON - 620° F

Question 5

How is the bleed air panel configured for a bleeds-off takeoff?

Answer 5

L and R engine bleed air - IN but illuminated OFF

APU Bleed air switch - IN and illuminated ON

Question 6

Other than selecting the isolation valve switch to OPEN, what other switch selections will automatically open the isolation valve?

Answer 6

Selecting START MASTER or CRANK MASTER and APU BLEED AIR (on ground)

Question 7

What is the function of the RAM AIR switch?

Answer 7

Turns OFF both packs, and allows ambient air into the cabin when the cabin pressure equals ambient

Question 8

Will the autothrottles be inhibited if the isolation valve is OPEN?

Answer 8

No, autothrottles operate normally regardless of the isolation valve position

Question 9

Max operating altitude for single pack?

Answer 9

48,000’

Question 10

At what cabin altitude will the passenger oxygen masks deploy if in AUTO?

Answer 10

Either 13,000 ft or 14,750 or 15,500 (depending on A/C serial number or ACS installation)

Question 11

At what pressure and or temperature will the O2 blow-out disk discharge?

Answer 11

Regulator pressure exceeds 90 PSI, O2 cyclinder pressure exceeds 2600 PSI, O2 temp exceeds 225°F.

Question 12

If the small knob on the front of the O2 mask is rotated to Emergency, what occurs?

Answer 12

O2 will be delivered continuously under pressure

Question 13

In the normal position, the flight crew oxygen mask will provide

Answer 13

Diluted oxygen in a decreasing ratio up to approximately 35,000’

Question 14

Are the aircraft O2 bottles interconnected?

Answer 14

No. Cockpit gets both bottles. Cabin only gets one.