Pressurization

Question 1

Each cabin pressurization controller directly controls a ___________ to independently operate the outflow valve.

Answer 1

DC Powered Motor

Question 2

T/F: One pressurization controller is alternately sequenced as the primary operational controller for each new flight?

Answer 2

True

Question 3

The amber pressurization AUTO FAIL light will illuminate for what conditions?

Answer 3

Indicates a single controller failure when ALTN light is also illuminated.

Indicates a dual controller failure when illuminated alone

Question 4

When does the cabin altitude warning horn sound?

Answer 4

When the cabin altitude exceeds 10,000 feet

Question 5

At FL410, the cabin altitude should be…

Answer 5

8,000 feet or 8.35 psi

Question 6

T/F: The manual pressurization controller has a separate DC powered motor that operates the outflow valve

Answer 6

True (separate from the motors the primary, automatic pressurization controllers use)

Question 7

Where is the aft outflow valve located?

Answer 7

The valve is mounted on the right underside of the airplane immediately aft of the aft cargo compartment.

Question 8

How long does it take the outflow valve to travel from fully open to fully closed?

Answer 8

Up to 20 seconds

Question 9

When do the positive pressure relief valves (2) open ?

Answer 9

8.95 psi differential

Question 10

What is the maximum cabin pressure differential?

Answer 10

9.1 psi

Question 11

Where is the negative pressure relief valve located?

Answer 11

The negative pressure relief valve is on the lower aft fuselage, on the right side, near the aft service door

Question 12

What is the maximum pressure differential for takeoff?

Answer 12

0.125 psi

Question 13

When does the OFF SCHED DESCENT light illuminate?

Answer 13

The OFF SCHED DESCENT light will illuminate when the airplane descended before reaching the planned cruise altitude set in the FLT ALT indicator.

Question 14

What is the max differential pressure for landing?

Answer 14

0.125 psi

Question 15

T/F: The cabin is set to land slightly pressurized so that rapid changes in altitude during approach result in minimum cabin pressure changes

Answer 15

True

Question 16

The majority of the Passenger cabin air is circulated through the air return grills and ducting of the _____________, then is discharged overboard via the aft outflow valve.

Answer 16

AFT cargo compartments

Question 17

How many positive pressure relief valves does the aircraft have?

Answer 17

2

Question 18

Normal operating differential pressure is allowed or not allowed within the amber band of the differential pressure gauge?

Answer 18

Allowed

Question 19

The ______________ valve prevents ambient pressure from exceeding cabin pressure by an excessive amount

Answer 19

negative pressure relief

Question 20

Where are the two main pressurization controllers located?

Answer 20

E&E Compartment

Question 21

When does the ALTN light illuminate at the bottom of the Bleed Air Control Panel?

Answer 21

1. Pressurization mode selector in ALTN position, or
2. If both ALTN and AUTO FAIL lights are lit, a single controller has failed and the has auto transferred to the other controller (when in Auto mode ) `

Question 22

During automatic pressurization, the cabin climbs at a rate ___________ to the aircraft rate of climb.

Answer 22

proportional

Question 23

When does the OFF SCHED DESCENT light illuminate?

Answer 23

When the airplane descended before reaching the planned cruise altitude set in the FLT ALT indicator.

Question 24

T/F: The cabin is set to land slightly pressurized so that rapid changes in altitude during approach result in minimum cabin pressure changes.

Answer 24

True

Question 25

How many electric motors are able to control the outflow valve via its actuator?

Answer 25

Three - one from each primary controller, and 1 from the manual controller (DC Powered)

Question 26

When does the cruise phase of the pressurization system start?

Answer 26

When the aircraft is within 0.25 psi of the altitude set in the FLT ALT window