Section 12 - Pressurization & Oxygen

Question 1

How is the outflow valve electrically operated?

Answer 1

ESS AC power in the AUTO mode and ESS DC power in the MANUAL mode

Question 2

From where does the pressurization system obtain altitude information?

Answer 2

From either DADC #1 or DADC #2

Question 3

Where does the pressurization system obtain its landing field elevation information?

Answer 3

From the pressurization selector panel

Question 4

How is pressurization controlled in the MANUAL mode?

Answer 4

By manipulating the manual hold rate knob that controls the DC motor to open and close the outflow valve

Question 5

How do you know how much the aircraft if climbing or descending when using the MANUAL rate knob?

Answer 5

By observing the cabin pressure indicator panel

Question 6

What is the function of the FLIGHT / LANDING switch?

Answer 6

In the landing position it will pressurize the cabin to whatever altitude is shown on the landing tape. In the flight position it will pressurize the cabin to the predicted altitude shown on the flight tape, or the altitude shown on the landing tape (which ever is higher)

Question 7

If the passenger oxygen automatically deploys, what else will turn on?

Answer 7

The NO SMOKING sign

Question 8

If the cockpit oxygen pressure gauges are showing adequate pressure, can you expect to receive oxygen if necessary?

Answer 8

No, the switches might be selected OFF

Question 9

If the crew oxygen toggle switch is shut off but the passenger oxygen toggle switch is selected on, will the crew receive oxygen?

Answer 9

Yes

Question 10

What precaution should be observed when turning on the passenger oxygen control?

Answer 10

Be sure to turn off the passenger oxygen at the passenger panel before turning on the passenger oxygen at the primary panel

Question 11

When using the crew oxygen masks, what buttons should be selected on the audio control panel?

Answer 11

Oxygen mask and hot microphone (both amber). In addition, speaker will need to be selected if headsets are not used

Question 12

If the oxygen mask is set to “normal”, what will be delivered to the mask?

Answer 12

Diluted oxygen in a decreasing ratio up to 35,000 feet cabin altitude, and 100% oxygen above 35,000 feet

Question 13

What does the small red knob on the front of the oxygen mask do?

Answer 13

If selected to “EMERGENCY”, it will provide oxygen under continuous positive pressure at any altitude

Question 14

At what cabin altitude will the passenger oxygen masks automatically deploy?

Answer 14

13,000 feet +/- 500 feet

Question 15

What is the maximum cabin differential permitted in flight?

Answer 15

9.80 psi

Question 16

What is the maximum cabin differential permitted for taxi, takeoff or landing? Why?

Answer 16

0.3 psi (to allow opening of the over-wing emergency exits if needed)

Question 17

A rapid depressurization has just occurred. Describe the, emergency procedure associated with this condition.

Answer 17

1. Crew Oxygen Masks - DON
2. Emergency Descent Procedure - INITIATE
3. Passenger Oxygen Masks - MANUALLY DEPLOY
4. Passenger Oxygen Masks - VERIFY DEPLOYMENT
5. Pressurization - RESTORE

Question 18

If a torn main entrance door or baggage door seal is suspected as the cause of a pressurization loss, what steps might be helpful to increase cabin pressure?

Answer 18

Increase bleed air pressure by selecting the cowl anti-ice ON or by increasing engine power, thereby increasing available bleed pressure above 35 psi

Question 19

An emergency descent is. required. Describe the emergency procedure associated with this condition.

Answer 19

1. Power Levers - IDLE
2. Airspeed - ESTABLISH MMo / VMo
3. Speed Brakes - EXTEND
4. SEAT BELT/ NO SMOKING Signs - ON
5. Transponder Code - SET 7700
6. Level Off - 15,000 FT OR MINIMUM ENROUTE ALTITUDE, IF HIGHER

Question 20

During cruise at FL350, you notice a large pressurization change on the cabin pressure indicator. Describe the abnormal procedures associated with a LOSS OF AUTOMATIC PRESSURIZATION CONTROL.

Answer 20

1. AUTO/ MANUAL Switch - MANUAL
2. DADC Selector Switch - OPPOSITE DADC
3. AUTO / MANUAL Switch - AUTO
4. If automatic pressurization control is not regained, control rate of climb manually to +/- 500 fpm