Pneumatics, Air conditioning & Pressurization

Question 1

Which engine stages is bleed air taken from?

Answer 1

The 9th (low pressure) and 14th (high pressure) stages. AOM 2-14-05 page 2.

Question 2

When does the 14th stage valve, called the High Stage Valve (HSV), open automatically?

Answer 2

During low thrust operations, engine cross bleed start, and anti-ice operation. AOM 2-14-05 page 2.

Question 3

When does the Cross-Bleed Valve (CBV) open and close automatically?

Answer 3

During engine start, depending on the available pneumatic source (APU, ground pneumatic source, or opposite engine). AOM 2-14-05 page 2A.

Question 4

What causes the APU Bleed Valve (ABV) to automatically close?

Answer 4

Whenever any engine is supplying bleed air to the left pneumatic side. AOM 2-14-05 page 4

Question 5

What causes the APU Bleed Valve (ABV) to automatically close?

Answer 5

Whenever any engine is supplying bleed air to the left pneumatic side. AOM 2-14-05 page 4.

Question 6

What cools the packs?

Answer 6

ACM fans on the ground, ram air in flight. AOM 2-14-10 page 2.

Question 7

When automatic temperature control is used, what are the temperature limits in the cockpit and cabin?

Answer 7

Between 18°C and 29°C. AOM 2-14-10 page 5.

Question 8

How do you activate manual cockpit and cabin temperature control?

Answer 8

Pull the temperature knobs. AOM 2-14-10 page 5.

Question 9

Which pack is the main source of conditioned air to the cockpit?

Answer 9

The left pack. AOM 2-14-10 page 6.

Question 10

Where does the gasper air subsystem provide air to?

Answer 10

The individual air outlets (gasper) in the cabin, the rear electronics compartment, the oxygen cylinder compartment, and relay box ventilation. AOM 2-14-10 page 6

Question 11

What happens when the Cabin Temperature Knob is rotated to the ATTD position?

Answer 11

The passenger cabin temperature control is transferred to the attendant’s panel. AOM 2-14-10 page 13.

Question 12

Will the ATTD selection on the Cabin Temperature Knob on the overhead panel work in manual mode?

Answer 12

No. It only works in automatic mode. AOM 2-14-10 page 13.

Question 13

What is maximum differential pressure?

Answer 13

7.8 psi. AOM 1-01-48 page 1.

Question 14

At what altitude does the Cabin Pressure Acquisition Module (CPAM) alert the crew of high cabin altitude?

Answer 14

9,900 +/- 100 ft. AOM 2-14-15 page 1.

Question 15

What will happen if the landing altitude is not entered in the Digital Controller?

Answer 15

The system will automatically consider 8,000 ft as the landing altitude.

AOM 2-14-15 page 2.

Question 16

What will happen if, while in AUTO mode, the Manual Controller is moved out of the DN position?

Answer 16

The pneumatic valve will open, causing inappropriate automatic mode operation. AOM 2-14-15 page 2.

Question 17

What opens the outflow valves?

Answer 17

Vacuum, created when bleed air from either or both engines that is ducted through an ejector pump.

AOM 2-14-15 page 3.

Question 18

If the cabin is depressurized by pressing the DUMP button, how high will the cabin altitude rise?

Answer 18

14,500 ft.

AOM 2-14-15 page 8.

Question 19

Will the DUMP button work in the manual mode?

Answer 19

No.

AOM 2-14-15 page 7.

Question 20

What are the memory items for Rapid Cabin Depressurization?

Answer 20

Crew Oxygen Masks…DON
Crew Communication…ESTABLISH, Emergency Descent…AS REQUIRED.

AOM 1-03-24 page 2.

Question 21

What are the memory items for Emergency Descent?

Answer 21

Cabin Crew...NOTIFY
Fasten Belts...ON, 
Thrust Levers...IDLE,
Speed Brakes...OPEN, 
Airspeed...250 KIAS, 
Landing Gear...DOWN, 
Altitude...MEA OR 10,000 FT WHICHEVER IS HIGHER. 

AOM 1-03-30 page 1.