Test 3: Pressurization Review

Question 1

What is atmospheric/barometric pressure?

Answer 1

14.7psi/29.92 inches of mercury

Question 2

True or False, Increased altitude results in decreased atmospheric pressure

Answer 2

True

Question 3

Why do we have pressurized aircraft?

Answer 3

Because we prefer to fly higher,
Decreased air density better on fuel
Enough O2 for proper blood saturation

Question 4

How much is the pressure differential on high performance jets?

Answer 4

9psi

Question 5

What is metal fatigue?

Answer 5

Repeated pressurization and depressurization weakens the air frame

Question 6

How are piston engine aircrafts pressurized?

Answer 6

super/turbo charger and engine driven compressor below 25000ft

Question 7

What are the 3 ways turbine engines use bleed air to pressurize the aircraft?

Answer 7

Jet Pump(venturi)
Turbo Comp (turbine turn)
Air Cycle Machine

Question 8

What is CABIN ALTITUDE and what is it expressed in?

Answer 8

Air Pressure in Cabin
Feet ABOVE SEA LEVEL
10.92psi = 8000ft

Question 9

What is CABIN DIFFERENTIAL?

Answer 9

Air Pressure INSIDE vs OUTSIDE expressed in PSI

Question 10

What is CABIN RATE OF CLIMB?

Answer 10

Rate of CHANGE of AIR pressure INSIDE the cabin

In FEET per MINUTE of cabin ALTITUDE change

Question 11

What are the 2 ways cabin pressurization can be controlled?

Answer 11

CONSTANT DIFFERENTIAL

ISOBARIC MODE

Question 12

Describe CONSTANT DIFFERENTIAL MODE?

Answer 12

maintains a CONSTANT pressure DIFFERENCE between AIR pressure INSIDE and OUTSIDE

Question 13

Describe ISOBARIC MODE

Answer 13

MAINTAINS cabin ALTITUDE at a SINGLE pressure despite a CHANGE in ALTITUDE

Question 14

What happens when the aircraft climbs above what the airframe was designed for?

Answer 14

goes from isobaric to constant differential

Question 15

This device is used to control the cabin air pressure

Answer 15

CABIN PRESSURE CONTROLLER

pneumatic and electric

Question 16

Adjustments and settings are made directly to the?

Answer 16

PRESSURE CONTROLLER

Question 17

The settings made to the PRESSURE CONTROLLER control what?

Answer 17

CABIN PRESSURE REGULATOR

Question 18

OUTFLOW VALVE is controlled by what and where is it located?

Answer 18

CABIN PRESSURE REGULATOR

Rear of aircraft pressure vessel

Question 19

What does the OUTFLOW VALVE do?

Answer 19

CONTROLS pressure level in the cabin

Question 20

How does the OUTFLOW VALVE work?

Answer 20

Regulates the amount of air flowing OUT of the cabin

Question 21

This component PREVENTS over PRESSURIZATION to ensure structural integrity of the aircraft if CONTROL of pressurization is LOST

Answer 21

SAFETY VALVE

Question 22

How does a SAFETY VALVE work?

Answer 22

Pressure relief valve SET to OPEN at a PREDETERMINED pressure DIFFERENTIAL

allows air to flow FROM cabin

Question 23

This component closes the OUTFLOW VALVE if PRESSURE drops well below normal

Answer 23

CABIN ALTITUDE LIMITERS

Question 24

What is a NEGATIVE PRESSURE RELIEF VALVE?

Answer 24

INSURES air pressure OUTSIDE does NOT EXCEED pressure INSIDE

Question 25

This component can be manually/automatically activated, it QUICKLY removes air during MAINTENANCE or EMERGENCY SITUATIONS

Answer 25

DUMP VALVE

Question 26

What is EMERGENCY PRESSURIZATION?

Answer 26

A mode when the AC pack FAILS or emergency pressurization is selected

mixes BLEED and RAM air into CABIN

Question 27

What controls the SAFETY VALVE switch on the ground?

Answer 27

WOW