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Dash 8 Q400 > Air conditioning / Pressurisation > Flashcards

Air conditioning / Pressurisation Flashcards

1
Q

setting the bleed selector knob to norm or max allows what to happen to the bleed port selections?

A

system to alternate between hi and low stage bleed as reqd

Allows ECU to modulate the Nacelle FCSOV’s (Flow Control Shutoff Valve) to control the volume of air from both engines at increased levels.

Changes rated power from NTOP to MCL

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2
Q

what % of airflow does cabin recieve

A

75%

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3
Q

Cabin outlet temp range

A

15-27 deg c

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4
Q

Damper valve moves up for heat or cool

A

Full up for cooling

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5
Q

CABIN PACK HOT or FLT COMPT PACK HOT caution light means? What automatically happens?

A

Respective pack becomes too hot. Causes turbine shutoff valve to close turning off pack. Once condition is rectified, light extinguishes.

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6
Q

CABIN DUCT HOT or FLT COMPT DUCT HOT caution light means? What automatically happens?

A

Respective Duct becomes too hot. Causes the affected turbine shutoff valve to close, turning off pack. Once the condition is rectified, the light extinguishes

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7
Q

Can A/C be flown unpressurised?

A

Yes, Ram air in fin is intake, outflow valve is exhaust

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8
Q

Which Avionics cooling fan can be operated on battery power? Redundancy?

A

Fan 1 on battery, fan 2 if fan 1 fails

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9
Q

FANS FAIL Alert means

A

Two avionics cooling fans have failed

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10
Q

AVIONICS caution and FANS FAIL message on ED means what?

A

Two avionics cooling fans have failed, displayed on ground only.

An avionics related no dispatch condition is sensed when the aircraft is on the ground

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11
Q

Will avionics cooling fans operate at cockpit temp below 5 degC

A

No

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12
Q

How is the aft outflow valve operated? From what bus?

A

Electrically operated by the LEFT MAIN DC BUS

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13
Q

True or false, the forward and aft safety valves operate as positive and negative pressure relief valves?

A

True

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14
Q

What are the 4 modes of pressurisation?

A

Auto
Manual
Emergency smoke removal
Pressure dump

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15
Q

Depressurising on ground conditions? Outflow valve to open.

A

Engine PLA <60%

& WoW both gear

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16
Q

When is the Aft safety valve held open? What holds it open?

A 
APU operating (or)
at least 1 engine running at idle (and)

On ground with power levers at flt idle or low power settings.

Cabin Pressurisation Controller CPC

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17
Q

What cabin altitude does the outflow valve pre-pressurise the cabin to at take off

A

-400’ AGL

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18
Q

How long does the pressurisation controller remain in take off mode for?

A

10 mins in case of a return to field

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19
Q

When does the pressurisation flight sequence begin

A

When the take off sequence is completed

20
Q

The descent sequence in auto mode can be increased to the rate of descent sequence how?

A

A high rate of descent

21
Q

When moving the main diff valve to DECR what happens?

A

Aft Outflow valve opens further decreasing the cabin pressure and increasing the cabin altitude

22
Q

Do you need electrical power to operate the FWD OUTFLOW knob

A

No

23
Q

True or False, The FWD OUTFLOW VALVE and AFT OUTFLOW VALVE work together to maintain the A/C’s pressurisation

A

False, theyre independent of each other

24
Q

What settings are available for the FWD SAFETY VALVE when selected by the Forward safety Valve selector guarded switch.

A

Full open
Full Closed
Can only be selected in between using the rotary knob in the pressurisation panel

25
Q

What procedure can the FWD SAFETY VALVE be used in? and how?

A

Removing smoke from flight deck. By opening valve and closing the AFT OUTFLOW FALVE (in auto mode) to suck it out the front of the A/C

26
Q

What does selecting the dump mode do?

A

Fully opens the outflow valve to dump cabin pressure

Can also be used for smoke evacuation

27
Q

When the Cabin pressure controller is operating in the auto mode, what is the normal position of the FWD OUTFLOW rotary knob?

A

Fully CLSD

28
Q

What does the MAN DIFF spring loaded switch do?

A

In manual mode, moves the outflow valve to increase or decrease cabin pressure

29
Q

What does the FAULT light mean on the PRESSURISATION CONTROL PANEL

A

Fault has been detected in the Cabin Pressure control system

30
Q

Take off with bleed on is permitted under what supplemental procedure in the AFM. What limitations are associated with restriction

A 
Tailwind < 10kts
RWY slope < 2*
Taking off with MTOP and UPTRIM
Operations with LDG GEAR extended N/A
Operations with one bleed system into N/A
31
Q

During the smoke removal procedure when opening the fwd safety valve using the rotary knob in the normal auto mode, what happens to the aft outflow valve

A

Begins closing to maintain the current cabin altitude. This leads to a vacuum in the front of the aircraft removing smoke on the flight deck.

32
Q

When the fwd outflow selector is turned clockwise for smoke removal in the Auto pressurisation mode, what does the rear outflow valve do?

A

Closes to maintain desired cabin pressure. Allowing smoke to vacate through the fwd pressurisation bulkhead and still maintain cabin altitude

33
Q

What cabin Alt will CABIN PRES warning light illuminate?

A

9800’

34
Q

What happens if both digital channels of the ECU (Electronic Control Unit) fail

A

The Pack FCSOV will close and the aircraft will depressurise

35
Q

The ECU keeps the temperature in the supply ducts between ____ & ____*

A

2.8 & 71*C

36
Q

Auto Vs Manual Pack operation?

A

Auto: ECU regulates temperature in the cabin by determining what the duct temperature is.

Manual: System targets the duct temperature instead of a cabin temp

37
Q

Auto Vs Manual Pack operation?

A

Auto: ECU regulates temperature in the cabin by determining what the duct temperature is.

Manual: System targets the duct temperature instead of a cabin temp

38
Q

How long should you wait until a change in gasper outlet temp can be felt?

A

1-3minutes

39
Q

How long should you wait until a change in gasper outlet temp can be felt?

A

1-3minutes

40
Q

Manual mode duct temperature limits?

A

3-71*C

41
Q

What is the layout of the air condtitioning system and where is it located?

A

Uses two ACM’s (air cycle machines) that utilise a single primary and secondary heat exchanger.

They are located in the aft fuselage.

42
Q

Why do the air cycle machines (ACM’s) utilise common heat exchangers?

A

Provides redundancy of two packs while allowing access to a much larger dual heat exchanger during operation with a single ACM.

43
Q

What does the Bleed control selector MIN / NORM / MAX actually change?

A

Modulates the Nacelle shut off valves
MIN - for minimum bleed air flow
NORM - for moderate bleed air flow
MAX - for maximum bleed air flow

44
Q

Is APU bleed airflow controlled by the bleed flow selection knob?

A

No it is controlled by a flow schedule internal to the ECU (environmental control unit)

45
Q

In addition to the flight compartment, the flight compartment pack also supplies conditioned air to?

A

Rear baggage compartment
Forward cabin attendant gasper
Lavatory gasper

46
Q

In addition to the flight compartment, the flight compartment pack also supplies conditioned air to?

A

Rear baggage compartment
Forward cabin attendant gasper
Lavatory gasper

47
Q

What condition indicates a failure of both digital channels? What will happen?

A

A combination failure ie.
- #1 & #2 Bleed Hot
- Cabin Pack / Duct Hot & Flt Comp Pack / Duct Hot

Aircraft will depressurise

Dash 8 Q400 (23 decks)

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