Pressurisation DSC 21 Flashcards

1
Q

System consists of….

A

2 Cabin Pressurisation Controllers (CPC)
1 Residual Pressure Control Unit (RPCU)
1 Outflow valve (with an actuator that incorporates 3 motors)
1 Control Panel
2 Safety Valves

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2
Q

The CPC’s receive info from…?

A

ADIRS
FMGC
EIU
LGCIU

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3
Q

When the system is in auto or semi-auto, 1 CPC is active and the other is on standby. T/F?

A

True

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4
Q

Where is the outflow valve situated?

A

RHS fuselage, behind aft cargo and below flotation line

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5
Q

When the RAM AIR pb is ON and ∆P is <1 psi what position does the system drive the outflow valve to if its under automatic control?

A

50% OPEN

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6
Q

When the RAM AIR pb is ON and ∆P is <1 psi what position does the system drive the outflow valve to if its under manual control?

A

The outflow valve does not automatically open,

even if the ∆P is <1 psi

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7
Q

At what pressure do the pneumatic safety valves activate?

A

> 8.6psi (can be a range of 8.2 - 8.9 due to accuracy of ∆P in MAN mode)

<1psi

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8
Q

Where are the safety valves located?

A

Rear pressure bulkhead,

above the flotation line

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9
Q

What does the Residual Pressure Control Unit (RPCU) do?

A

Automatically depressurises the aircraft in case of abnormal residual pressure on the ground.

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10
Q

When does the Residual Pressure Control Unit (RPCU) automatically open the outflow valve?

A

The aircraft is on the ground, and
The outflow valve is not fully open, and
Both CPC’s are failed, or manual mode is selected, and
All engines shutdown, or ADIRS indicate <100kts

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11
Q

How many CPC’s operate at the same time?

A

only 1

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12
Q

When does automatic change over of the CPC’s occur?

A
  • 70secs after each landing

- If the operating CPC fails

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13
Q

Where does the CPC get landing elevation, QNH and Pressure altitude info from?

A

FMGC -landing elevation, QNH

ADIRS -Pressure altitude

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14
Q

If FMGC data is not available to the CPC then where does the CPC get BARO and Landing elevation info from?

A

ADIRS -BARO

LDG ELEV knob -Landing elevation

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15
Q

When is the outflow valve fully open?

A

Before take-off and

55 sec after landing

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16
Q

At touchdown, any remaining pressure is released at. ______ft/min

A

500 ft/min

17
Q

To avoid pressure surge at rotation the controller pre-pressurises the aircraft at a rate of _____ft/min, until the ∆P reaches _____psi

A

400 ft/min

0.1 psi

18
Q

During descent the controller maintains a cabin rate of descent such that the cabin pressure is equal to the landing field pressure +_____psi shortly before landing.

19
Q

What is the maximum descent rate?/

A

750 ft/min

20
Q

If the aircraft does not climb after take-off what does the abort mode do?

A

Prevents the cabin altitude from climbing.

21
Q

What is cabin altitude set to after an abort?

A

take-off altitude +1psi

22
Q

What happens when the mode selector is selected to MAN?

A

Power is cut to the automatic motors.

MAN motor can control the outflow valve

23
Q

What does the MAN V/S CTL switch UP position do?

A

Opens the outflow valve

Increases the Cabin Altitude

24
Q

Due to the slow operation of the outflow valve in manual mode and the limited resolution of the position on ECAM, how long can the visual ECAM take to indicate the change in position?

A

up to 5secs

25
In MAN operation, does the outflow valve open automatically at touchdown?
NO!
26
What does the DITCHING pb on the CABIN PRESS control panel do?
``` Closes all hatches below the flotation line: Outflow valve Emergency RAM AIR inlet Avionics vent inlet Extract valves Pack flow control valves ```
27
How can the flight crew select the other CPC?
By switching the MODE SEL to MAN, for at least 10sec, then returning it to AUTO
28
When will the MODE SEL FAULT light illuminate?
When BOTH automatic systems are faulty
29
If in MAN mode and the DITCHING pb is switched ON, will the outflow valve close automatically?
NO!
30
When will VS FT/MIN appear in amber?
VS >= 2000 fpm
31
When will VS FT/MIN pulse green?
VS > 1800fpm | resets at 1600 fpm
32
When will ∆P appear in amber?
∆P <= -0.4 psi, or | ∆P >= 8.5 psi
33
When will ∆P appear pulse green?
∆P > 1.5 psi during flight phase 7 (800ft to touchdown) | resets at 1 psi
34
When will the CAB ALT appear in Red?
>9550 ft
35
When will the CAB ALT pulse green?
At or above 8800 ft | resets at 8600 ft
36
SAFETY in amber on the CAB PRESS SD page means?
either safety valve is not closed
37
When would the outflow valve position become amber?
Valve opens > 95% during flight