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Dash8 > Aircon And Pressurisation > Flashcards

Aircon And Pressurisation Flashcards

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?

A

No

24
Q

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

A

28v DC to the left and right main buses

25
Q

Four modes of operation for the pressurisation system?

A

Fully automatic
Semi automatic
Manual
Dump

26
Q

The CABIN DUCT HOT caution light causes which valve or set of valves to drive to full coil position?

A

Pack temperature control valves

27
Q

What is the cabins rate of change with the rate knob at its index?

A

500fpm up

300fpm down

28
Q

What automatic feature is associated with the AIR CON PACK HOT caution light?

A

All engine bleeds to the pack shut off

29
Q

How can smoke be evacuated from the cabin?

A

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
Q

What are the five components that require bleed air to operate?

A

Cabin door seals
De ice boots
Air conditioning and heating
Pressurisation
Rear outflow valve

31
Q

If a cooler cabin temp is selected. The ACM pack bypass will?

A

Close

32
Q

The AIR COND PACK HOT caution light excess temp is being sensed?

A

Compressor discharge over temperature sensor

33
Q

If operating with only essential services, how can the aircraft be de pressurised?

A

Forward outflow valve must be used.

34
Q

The forward and rear outflow valves are set to relive pressure automatically at what psi?

A

5.8 psi +- .15

35
Q

How would you utilise the pressurisation system to remove smoke from cargo area?

A

Norm/Cab switch set to Cab
Select a higher cabin altitude or
Select rear outflow valve to dump using Auto/Man/Dump switch

36
Q

If the left and right secondary busses fails how will the high pressure valve and PRSV position themselves?

A

High pressure valve closes

PRSV opens

37
Q

Can cabin crew select cabin temp in the “manual mode” which the flight compartment temp controller is in Auto mode?

A

Yes

38
Q

Are both outflow valves capable of automatic pressure relief at 5.8PSI +- .15?

A

Yes

39
Q

Will the aircraft pressurise with bleeds off?

A

No

40
Q

How is the rear outflow valve powered?

A

By suction created by the 18psi Denice system air flowing through a Venturi.

41
Q

What happens when a BLEED HOT caution light illuminates?

A

That bleed is shut off

42
Q

What does I mean when the CABIN PRESS warning light illuminates?

A

Cabin altitude has exceeded 10,000ft

43
Q

What occurs when the pressurisation toggle switch is selected to Auto?

A

Rear outflow valve is controlled by the pressurisation computer

44
Q

What occurs when pressurisation toggle switch is placed in the Dump position?

A

Rear outflow valve opens fully

45
Q

A FLT COMPT DICT HOT caution light causes which set of valves to drive to full cool position?

A

Trim valves

46
Q

How would you remove smoke from the cockpit?

A

Manual increase know increased or

Forward dump valve to open

47
Q

What % of conditioned air does to the flight deck?

A

30%

48
Q

What does the MIN/MAX rheostat on the bleed control panel do?

A

Adjusts the amount of air flow to the ACM

49
Q

Will heat/air conditioning/pressurisation still be available if the main buses are not energised?

A

Yes, bleed valves will fail in the open position.

50
Q

Why should the forward outflow valve be slightly opened before selecting the toggle switch to “Manual” when transitioning from Auto?

A

To prevent a pressurisation dump

51
Q

The CABIN DUCT HOT caution light illuminates at?

A

88 degree C

52
Q

What is the position. Of the rear outflow valve when A/C is on and aircraft is in the ground with engine bleeds on?

A

Open (Because we are on the ground)

53
Q

Can pressurisation be maintained with only one bleed source available?

A

Yes

54
Q

Is the cargo area pressurised?

A

Yes

55
Q

What happens when the pressurisation toggle switch is selected to Manual?

A

Rear outflow valve closes. Pressurisation is then accomplished by modulating the forward outflow valve

56
Q

Can all systems operate with only one bleed air source available?

A

Yes

Dash8 (11 decks)

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