Pneumatics and Environmental

Question 1

Concerning aircraft pressurization, the active pressurization controller will send a signal to drop the passenger oxygen masks automatically at

A). 14,500’ +/- 500’ cabin altitude

B). 10,000’ +/- 500’ cabin altitude

C). 8,000’ +/- 500’ cabin altitude

D). 12,500’ +/- 500’ cabin altitud

Answer 1

14,500’ +/- 500’ cabin altitude

Question 2

Cabin pressure is maintained by
A). A single electrically actuated triple motored outflow valve

B). Two electrically controlled, pneumatically actuated outflow valves

C). A single electrically actuated inflow valve

C). Carefully managing the amount of stress among those occupying the cabin

Answer 2

A single electrically actuated triple motored outflow valve

Question 3

For aircraft pressurization modes, the flight abort mode of the automatic pressurization system
A). Is disarmed 15 minutes after takeoff

B). Is disarmed once the cabin altitude reaches 3000’

C). Is disarmed once the aircraft altitude is greater than 6000’

D). All of the above

Answer 3

Is disarmed once the aircraft altitude is greater than 6000’

Question 4

As a pnuematic air source on the ground, the low pressure air connection (for air conditioning) is located on the
A). Left side of aircraft aft the wing

B). Right side of aircraft, rear fuselage (aft of wing)

C). Under the belly of aircraft

D). Right side of aircraft forward the wing

Answer 4

Right side of aircraft, rear fuselage (aft of wing)

Question 5

Pressing the EMER DEPRESS switchlight at FL290 will

A). Drive the outflow valve fully open

B). Allow the cabin to rise to approximately 14,500 ± 500 ft

C). Shut off both packs

D). Both A and B are correct

Answer 5

Drive the outflow valve fully open
Allow the cabin to rise to approximately 14,500 ± 500 ft

Question 6

The left pack (Air Conditioning system) normally influences air to the
A). Passenger compartment

B). Flight deck

C). Cargo compartment

D). Avionics cooling

Answer 6

Flight deck

Question 7

For the aircraft Bleed Air Leak Detection System, the bleed air pneumatic ducting utilizes a dual loop sensing system. The purpose of a dual loop system is to

A). Provide redundancy

B). Minimize false overheat indications

C). Provide an increased ability to dispatch the aircraft

D). All of the above

Answer 7

Provide redundancy
Minimize false overheat indications
Provide an increased ability to dispatch the aircraft

Question 8

For Bleed Air Distribution, with the isolation valve closed, the right side of the bleed air manifold can be pressurized by

A). The APU

B). An external air source

C). The right engine

D). B and C

Answer 8

The right engine

Question 9

For aircraft Bleed Air Distribution, the left side of the bleed air manifold can be pressurized by
A). The left engine

TB). he APU

C). An external air source

D). All of the above

Answer 9

The left engine
the APU
An external air source

Question 10

For Bleed Air Distribution, when the 6th stage air pressure is high enough to satisfy the requirements of the pneumatic system
A). The active pressurization controller will command the HPV closed

B). The ACSC (Air Conditioning System Controllers) will command the HPV (High Pressure Valve) open

C). The ACSC (Air Conditioning System Controller) will command the HPV (High Pressure Valve) closed

D). The ACSC (Air Conditioning System Controller) will command the associated PRSOV (pressure regulating shut-off valves, or Engine Bleed Valves) closed

Answer 10

The ACSC (Air Conditioning System Controller) will command the HPV (High Pressure Valve) closed

Question 11

A red CABIN ALT warning message indicates

A). Cabin altitude above 10,000 ft.

B). Cabin altitude above 12,500 ft.

C). Cabin altitude above 14,000 ft.

D). Cabin altitude above 8,500 ft.

Answer 11

Cabin altitude above 10,000 ft.

Question 12

The outflow valve is opened and closed through the use of

A). Vacuum pressure from bleed air manifold.

B). Electric motor.

C). Mechanical spring loaded valves.

D). None of the above.

Answer 12

Electric motor.

Question 13

The manual cabin altitude switch, when selected up in the manual pressurization mode

A). Causes the outflow valve to open and increase cabin altitude.

B). Causes the outflow valves to open and decrease cabin altitude.

C). Causes the outflow valves to close and increase cabin altitude.

D). Causes the outflow valves to close and decrease cabin altitude.

Answer 13

Causes the outflow valve to open and increase cabin altitude.

Question 14

The cabin pressure controllers:

A). Control all phases of pressurization in automatic mode.

B). Control all phases of pressurization in manual mode.

C). Are both active at one time.

D). Both A and B.

Answer 14

Control all phases of pressurization in automatic mode.

Question 15

The right hand pack primarily influences air to the:

A). Passenger compartment

B). Flight Deck

C). Aft equipment

D). Avionics bay

Answer 15

Passenger compartment

Question 16

OVBD COOL caution message indicates

A). Avionics cooling is not effective.

B). The avionics fan designated as primary for that flight has failed or is providing inadequate airflow.

C). CRT’s are not receiving adequate cooling airflow.

D). That the ground valve has failed open in flight

Answer 16

That the ground valve has failed open in flight.

Question 17

An AUTO PRESS caution message indicates

A). That the cabin pressure controller in use has failed.

B). That the pressurization system is being used in the manual mode.

C). That both of the cabin pressurization controllers have failed.

D). That the ram air shut off valve is open.

Answer 17

That both of the cabin pressurization controllers have failed.

Question 18

The aural “CABIN PRESSURE” alert is associated with

A). The cabin altitude exceeding 10,000 feet.

B). Failure of the active pressurization controller.

C). Differential pressure in excess of 8.6 psi.

D). Both A and C

Answer 18

The cabin altitude exceeding 10,000 feet.
Failure of the active pressurization controller.

Question 19

The flight abort mode of the automatic pressurization
A). Is armed during the entire route.

B). Alleviates the need to reset the landing elevation when aborting a flight at any point along the route.

C). Alleviates the need to reset the landing elevation when aborting a flight below 6,000 feet and is armed or only 10 minutes.

D). Both A and B are correct.

Answer 19

Alleviates the need to reset the landing elevation when aborting a flight below 6,000 feet and is armed or only 10 minutes.

Question 20

A FAULT light on the air conditioning panel illuminates
A). Indicates that the pack has failed in both automatic and manual modes.

B). Due to underpressure or overtemperature.

C). Due to overpressure or undertemperature.

D). Due to underpressure or undertemperature

Answer 20

Indicates that the pack has failed in both automatic and manual modes.

Question 21

Low pressure ground air can be routed through bleed air manifold for engine starting.
t
f

Answer 21

False

Question 22

Single pack operations are limited to what altitude?
400
250
200
310

Answer 22

FL310

Question 23

During ground operations, pneumatic air for the ECS can be obtained from the
APU
Engines
external air cart
all of the above

Answer 23

APU
Engines
External air cart

Question 24

While at FL310, the EMER DEPR switchlight is pressed. Cabin altitude will
A). Descend to 14,500’ ± 500’

B). Equal pressure altitude

C). Climb to 14,500’ ± 500’

D). Equalize to just below 8psi differential pressure to maintain structural integrity.

Answer 24

Climb to 14,500’ ± 500’

Question 25

The cooling air for the PACK air-to-air heat exchangers is supplied by

A). Display fan

B). High pressure bleed air.

C). Ram air scoop

D). ARINC fan

Answer 25

Ram air scoop

Question 26

A DUCT MON FAULT status message indicates:
A). A normal indication following an overheat caused the system to close a shut off valve

B). Loss of redundancy in the bleed air leak detection system

C). Failure of the bleed air leak detection system

D). Failure of the AIRINC system linking the detection loops to the AILC

Answer 26

Loss of redundancy in the bleed air leak detection system

Question 27

Maximum negative differential pressure is:
-0.2
-1.0
-1.5
-0.5

Answer 27

• 0.5 psi

Question 28

Maximum pressure relief differential is:
8.9
8.1
8.7
8.5

Answer 28

8.7 PSI