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Dash8 > Aircon And Pressurisation > Flashcards

Aircon And Pressurisation Flashcards

(56 cards)

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1
Q

Max cabin altitude

A

8000ft

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2
Q

When are bleeds off?

A

TKOF and LDG

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3
Q

Normal cabin pressure differential

A

5.5psi +- 0.3psi

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4
Q

Max cabin pressure differential for TKOD and LDG

A

0.5psi

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5
Q

How much can the FA vary temp using the bias controller?

A

Full control

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6
Q

Which component is bypassed when using the manual temp mode?

A

Auto temp controller

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7
Q

Procedure fit correct emergency Ram ventilation?

A

Recirc - fan off
Bleeds - min/off
AUTO/MAN/DUMP - manual
Manual knob - full clockwise
Forward out flow valve - open

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8
Q

What three factors does the pressurisation system depend on?

A

Inflow of air
Sealed vessel
Metered outflow of air

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9
Q

If pressurisation controlled manually, which way do you turn the knob to decrease cabin altitude?

A

Counter clockwise

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10
Q

Manual increase know it turned which way to decrease cabin altitude?

A

Counter clockwise

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11
Q

Which valve is actuated when selecting a cooler compartment via the air divert switch?

A

Divert valve

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12
Q

Can the forward outflow valve be opened on the ground?

A

No

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13
Q

What is the difference between the forward outflow selector and the manual increase knob?

A

They both open the forward outflow valve

But manual increase knob allows a modulated opening

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14
Q

How do you change from fully auto mode to semi auto mode for the pressurisation system?

A

Cabin Set/Norm switch to Cab Set

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15
Q

Under normal conditions what position should the bleed flow selector knob be in?

A

Max

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16
Q

Can the flight compartment fan be switched on in flight?

A

No

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17
Q

When electrical power is first applied to the aircraft, the pressurisation fault light illuminates for how long?

A

2 seconds

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18
Q

At FL250, what should the cabin altitude read? (Max cabin Altitude)

A

8000ft

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19
Q

If you land with the cabin below destination elevation the rear outflow valve opens to allow the cabin to climb at?

A

600fpm

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20
Q

What happens to the rear outflow valve upon touchdown?

A

It opens

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21
Q

What does the fault light indicate in the pressurisation panel?

A

Pressurisation computer is experiencing a fault or is conducting a self test.

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22
Q

Cooling for the avionics is provided by?

A

The avionics and cabin recirculating fans

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23
Q

Does the pressurisation toggle switch have to be in manual for the manual increase knob to work?

24
Q

What voltage is required for bleed 1 and 2 switches to operate?

Study These Flashcards
A

28v DC to the left and right main buses

25
Four modes of operation for the pressurisation system?
Fully automatic Semi automatic Manual Dump
26
The CABIN DUCT HOT caution light causes which valve or set of valves to drive to full coil position?
Pack temperature control valves
27
What is the cabins rate of change with the rate knob at its index?
500fpm up 300fpm down
28
What automatic feature is associated with the AIR CON PACK HOT caution light?
All engine bleeds to the pack shut off
29
How can smoke be evacuated from the cabin?
Norm/Cab know set to Cab Select a higher cabin altitude Or select the rear outflow valve to dump using Auto/Man/Dump switch
30
What are the five components that require bleed air to operate?
Cabin door seals De ice boots Air conditioning and heating Pressurisation Rear outflow valve
31
If a cooler cabin temp is selected. The ACM pack bypass will?
Close
32
The AIR COND PACK HOT caution light excess temp is being sensed?
Compressor discharge over temperature sensor
33
If operating with only essential services, how can the aircraft be de pressurised?
Forward outflow valve must be used.
34
The forward and rear outflow valves are set to relive pressure automatically at what psi?
5.8 psi +- .15
35
How would you utilise the pressurisation system to remove smoke from cargo area?
Norm/Cab switch set to Cab Select a higher cabin altitude or Select rear outflow valve to dump using Auto/Man/Dump switch
36
If the left and right secondary busses fails how will the high pressure valve and PRSV position themselves?
High pressure valve closes PRSV opens
37
Can cabin crew select cabin temp in the “manual mode” which the flight compartment temp controller is in Auto mode?
Yes
38
Are both outflow valves capable of automatic pressure relief at 5.8PSI +- .15?
Yes
39
Will the aircraft pressurise with bleeds off?
No
40
How is the rear outflow valve powered?
By suction created by the 18psi Denice system air flowing through a Venturi.
41
What happens when a BLEED HOT caution light illuminates?
That bleed is shut off
42
What does I mean when the CABIN PRESS warning light illuminates?
Cabin altitude has exceeded 10,000ft
43
What occurs when the pressurisation toggle switch is selected to Auto?
Rear outflow valve is controlled by the pressurisation computer
44
What occurs when pressurisation toggle switch is placed in the Dump position?
Rear outflow valve opens fully
45
A FLT COMPT DICT HOT caution light causes which set of valves to drive to full cool position?
Trim valves
46
How would you remove smoke from the cockpit?
Manual increase know increased or Forward dump valve to open
47
What % of conditioned air does to the flight deck?
30%
48
What does the MIN/MAX rheostat on the bleed control panel do?
Adjusts the amount of air flow to the ACM
49
Will heat/air conditioning/pressurisation still be available if the main buses are not energised?
Yes, bleed valves will fail in the open position.
50
Why should the forward outflow valve be slightly opened before selecting the toggle switch to “Manual” when transitioning from Auto?
To prevent a pressurisation dump
51
The CABIN DUCT HOT caution light illuminates at?
88 degree C
52
What is the position. Of the rear outflow valve when A/C is on and aircraft is in the ground with engine bleeds on?
Open (Because we are on the ground)
53
Can pressurisation be maintained with only one bleed source available?
Yes
54
Is the cargo area pressurised?
Yes
55
What happens when the pressurisation toggle switch is selected to Manual?
Rear outflow valve closes. Pressurisation is then accomplished by modulating the forward outflow valve
56
Can all systems operate with only one bleed air source available?
Yes

Dash8 (11 decks)

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