Pressurization

Question 1

To regulate cabin pressure, the cabin controller modulates the:

Answer 1

Outflow valve

Question 2

Illumination of the amber CABIN ALT light ( if installed) indicates:

Answer 2

Cabin altitude is at or above 8,750 +/- 250 ft, and the pressurization control system is in manual mode

Question 3

On aircraft with emergency pressurization valves, if DC power fails:

Answer 3

The emergency pressurization valves automatically actuate to provide emergency cabin pressure

Question 4

The cabin altitude warning horn sounds when cabin altitude reaches approximately:

Answer 4

10,100 ft

Question 5

To dump residual cabin pressure on touchdown:

Answer 5

The outflow valve opens automatically

Question 6

On aircraft without the emergency pressurization valves, if DC power fails:

Answer 6

The cabin will remain pressurized, but emergency pressurization capability will be lost

Question 7

On all aircraft, if DC power fails

Answer 7

The manual mode of pressurization control can not be selected or maintained.

Question 8

Freon Cooling System ABOVE

Answer 8

18,000 or 35,000

Question 9

What conditions need to be met to turn on air conditioner during Engine(s) start/taxi

Answer 9

Each ammeter reads below 250 amps with both engines operating

OR

One ammeter reads below 150 amps with one engine operating

Question 10

When CAB AIR and BLEEDS switch is ON during ground operation

Answer 10

Don’t operate engines above idle for extended periods of time.

Question 11

Auxiliary heat operation requires the damper control knob to be closed.

This means..

Answer 11

Flow into cabin not Baggage compartment.

Question 12

Cabin Altitude reaches:

8,750 
9,500
10,100
11,500
14,000

Answer 12

8,750 : +/- 250 - Cabin aneroid switches to MAN and Illuminates CAB ALT light

Aneroid resets (minimally) at 7,200’

9,500 : +/- 250 -:
Cabin aneroids (one each EMER VALVE) position EMER VALVES to EMER PRESS. 

Aneroid reset to enable resetting EMER VALVES at 7,200. Must manually reset valuve.

10,100 : +/- 250 - Cabin Altitude Warning Horn

11,500 : Cabin Altitude Limiters

14,000: +/- 750 - Oxygen Masks Drop

Question 13

Max Differential Pressure

Outflow Valve
Cabin Safety Valve
Normal

Answer 13

Outflow Valve - 9.4
Cabin Safety Valve - 9.7
Normal - 9.2

Question 14

ANTI-ICE ops with EMER bleed Valves On . =

Answer 14

Pneu Bleed Anti-Ice unavailable except Nacelle heat

Question 15

Landing or taking off at Field elevations 8.500 (aircraft with emergency pressurization override switches)

Answer 15

Review procedures at AFM Sec. 2