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E175 > Pressurization > Flashcards

Pressurization Flashcards

1
Q

Where is the position of the outflow valve displayed?

A

ECS synoptic page of MFD

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2
Q

The CPCS can operate in which modes?

A

Both manual and automatic

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3
Q

Which of the following are components of the CPCS?

A

Cabin Pressure Controller (CPC),

Cabin Outflow Valve (OFV),

Positive Pressure Relief Valve (Safety Valve),

Negative Pressure Relief Valve (NPRV)

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4
Q

The pressurization panel is found where?

A

Overhead panel

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5
Q

True or False: The basic function of the CPC is to modulate the outflow valve in
in order to maintain proper cabin pressure.

A

True

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6
Q

True or False: The CPC modulates the outflow valve based on information received from various aircraft sensors and systems.

A

True

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7
Q

True or False: The CPC is a quad channel controller.

A

False

[Dual = active and standby]

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8
Q

True or False: If a CPC channel should fail, an EICAS message will be displayed.

A

True

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9
Q

The outflow valve _______ to increase cabin pressure and _______ to decrease cabin pressure.

A

Closes, opens

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10
Q

True or False: Normally, the outflow valve is modulated automatically by the CPC.

A

True

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11
Q

What is the proper way to increase cabin pressure while operating in the manual mode?

A

Rotate the Cabin Altitude selector knob to the down position

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12
Q

The Negative Pressure Relief Valve serves which purpose?

A

Prevents damage to the aircraft structure due to excessive negative differential pressure

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13
Q

The Negative Pressure Relief Valve is operated how?

A

Spring loaded

[-check valve - opens automatically based on pressure differential]

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14
Q

At which point will the Negative Pressure Relief Valve open?

A

If there is a pressure differential that exceeds -.5 psi between the cabin and the surrounding environment

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15
Q

True or False: The Negative Pressure Relief Valve requires no electricity to operate.

A

True

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16
Q

The Positive Pressure Relief Valve is operated how?

A

Spring loaded

[-check valve opens automatically based on pressure differential]

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17
Q

True or False: The Positive Pressure Relief Valve opens when the pressure
differential exceeds 8.6 PSI.

A

True

18
Q

True or False: The Positive Pressure Relief Valve is connected to its own static port.

A

True

19
Q

True or False: The Positive Pressure Relief Valve is installed to prevent damage to the aircraft structure due to excessive positive overpressure.

A

True

20
Q

True or False: The Positive Pressure Relief Valve’s static port is not electrically heated, due to the fact that it does not protrude from the fuselage.

A

False

21
Q

At which point would the Positive Pressure Relief Valve activate?

A

When differential pressure exceeds 8.6 psi

22
Q

True or False: The Positive Pressure Relief Valve is located in the aft section of the
aircraft (aft pressure dome).

A

True

23
Q

True or False: DUMP cannot be used in the automatic mode to relieve pressure if
needed. This is only done through manual mode.

A

False

[2.23 Vol 2 NOTE: “The Dump Function of the outflow valve is not available in Manual Mode. However if the button is pushed in, both recirculation fan and packs are turned off.”]

24
Q

What information does the CPCS take into account when scheduling a target cabin
altitude and cabin pressure variation?

A

Gross weight,
cruise altitude,
landing field elevation

25
Q

True or False: The Negative Pressure Relief Valve only works if the Positive Pressure Relief Valve is operational.

A

False

26
Q

What is the default Landing Field Elevation (LFE) value used by the CPCS if no
pilot input is made with the LFE knob when FMS field elevation is not available?

A

8,000 ft

27
Q

True or False: When cruise altitude is not available from the FMS, the cabin
pressure schedule is based on ambient pressure.

A

True

28
Q

True or False: The Negative Pressure Relief Valve works independently from the
normal Outflow Valve.

A

True

29
Q

In regard to the CPCS, what are the special procedures for high altitude
Operations?

A

There are no special procedures for high altitude operations

30
Q

How is the DUMP function activated for the CPCS?

A

By pushing in the guarded DUMP button on the pressurization panel

31
Q

What happens when the DUMP function is activated?

A

CPCS automatically: sets the packs and recirculation fans to OFF,

controls the outflow valve to maintain the cabin altitude rate of climb at 2000 ft/min up to 12,400 ft,

and closes the outflow valve at 12,400 ft allowing the cabin altitude to rise by natural leak

32
Q

True or False: When the CPCS is in manual mode, no pilot input is necessary to
adjust cabin pressurization.

A

False

33
Q

What will occur if the cabin altitude reaches 9,700 ft.?

A

EICAS displays message CABIN ALTITUDE HI,

the aural warning “CABIN” is played on the flightdeck loudspeaker

34
Q

Automatic mode for the CPCS has which of the following modes?

A

Ground,
Taxi,
Takeoff,
Climb,
Cruise,
Descent,
Abort

35
Q

True or False: When the CPCS is in GROUND mode, the outflow valve is in the
fully open position.

A

True

36
Q

True or False: There is a pressurization ABORT mode in the event a return to field
after takeoff is necessary.

A

True

37
Q

What happens when the DUMP button is activated?

A

Sets the packs and recirculation fans to OFF (even in Manual Mode),

(If not in manual mode:) controls the outflow valve to maintain the cabin altitude rate of climb at 2000 ft/min up to 12,400 ft,

closes the outflow valve at 12,400 ft

38
Q

The outflow valve is manually modulated by _______.

A

Manually adjusting cabin altitude with the CABIN ALT selector knob

39
Q

True or False: The Negative Pressure Relief Valve works with a static port in order
for it to function properly.

A

False

40
Q

True or False: Cruise altitude entered in the MCDU has no effect on CPC pressurization calculations.

A

False

E175 (23 decks)

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