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Dash 8 Q300/200 > Pneumatics-Air Conditioning > Flashcards

Pneumatics-Air Conditioning Flashcards

1
Q

Bleed air is available to the Deicing system when ?

A

Any time either engine is operating

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2
Q

When the packs switch is set to the off position which valves are closed?

A

The pressure regulating and shut off valves are closed

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3
Q

With the BLEED flow selector knob set to MIN position the Forward air conditioning pack pressure relief shut off valve and aft air conditioning pack pressure relief shut off valve are in what position?

A

The Forward air conditioning pack PRSOV is open and regulating at low pressure, the aft air conditioning pack PRSOV is closed

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4
Q

If the cabin pack hot caution light illuminates what will occur?

A

The temperature of air exiting the pack compressor is too high, and the associated PRSOV will automatically close to cut off bleed air supply

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5
Q

If the FLT COMPT DUCT HOT Caution light illuminates what occurs?

A

Duct temperature has exceeded 88°C and the pack temp control valve will command full cool to control the duct temperature

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6
Q

At high power settings bleed air is supplied from where?

A

LP compressor (P2 .5)

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7
Q

Illumination of a BLEED HOT Caution light is an indication of what?

A

An over temperature, or over pressure condition

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8
Q

With the BLEED flow selector knob set to the max position The forward and aft pressure relief shut off valves are in what position and regulating at what pressure?

A

The forward air conditioning pack pressure relief shut off valve is open and regulating at high-pressure, the aft air conditioning pack pressure relief shut off valve is open and regulating at high-pressure

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9
Q

The forward, or #2 Air conditioning pack supplies air directly to which part of the aircraft?

A

Flight deck

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10
Q

Does the vacuum powered gyroscopic instruments use bleed air ?

A

No

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11
Q

The purpose of the wing isolation check valve is what?

A

To prevent cross feed from the opposite bleed system

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12
Q

In order to give control over cabin temperature to the cabin crew, flight crew should make which selection?

A

Rotate the cabin temp control knob to the F/A position

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13
Q

The valve that controls whether bleed air is supplied from the HP or LP compressor is what?

A

High-pressure shut off valve (HPSOV)

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14
Q

Is bleed air supplied even if the bleed air switches are off ?

A

Yes it’s upstream from the NSOVs

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15
Q

Selecting the bleed air switches on does what ?

A

Opens the associated nacelle shut off valve and arms the and arms the HP
bleed switches to enable
automatic operation of the
HP shutoff valve.

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16
Q

Two PRSOVs, one for each
air conditioning pack, are
installed ?

A

installed in the bleed air duct

in the rear fuselage.

17
Q 
Two PRSOVs, one for each
air conditioning pack, are
installed in the bleed air duct
in the rear fuselage. These
valves serve a dual purpose which are ?
A 
Firstly, they provide a means
of shutting off the flow of
bleed air to a pack when air
conditioning is not required.
This function is accomplished
by selecting the
OFF/MAN/AUTO PACKS
control switches on the air
conditioning panel to OFF
18
Q

With the PACKS switches set
to MAN or AUTO, the PRSOVs
serve a second function which is ?

A 
is regulating the flow of bleed
air to the air conditioning
packs.
This function is achieved by a
rotary BLEED flow control
knob on the air conditioning
panel.
19
Q

When MIN is selected the #2
air-conditioning pack PRSOV
is ?

A 
is open, while the #1 air-
conditioning pack valve is
closed.
The #2 air-conditioning pack
PRSOV regulates at a low
pressure resulting in the pack
receiving reduced bleed-air
flow.
20
Q

When NORM is selected both
forward and rear air-
conditioning pack PRSOVs are ?

A 
are open. Both valves
regulate at a low pressure
resulting in the packs
receiving reduced bleed-air
flow.
21
Q

When MAX is selected, both
air-conditioning pack PRSOVs
are ?

A

open. The valves regulate
at normal pressure resulting in
the packs receiving maximum
bleed-air flow.

22
Q

The Cabin Pressurisation
Controller controls cabin
pressurisation separately by
the use of ?

A

Outflow valves

23
Q 
Pressure and temperature
sensors in the bleed duct
illuminate either the #1 BLEED
HOT or the #2 BLEED HOT
caution light, as appropriate what happens ?
A

The associated nacelle
shutoff valve, and high
pressure shutoff valve, are
closed simultaneously.

24
Q

The temperature-controlled
air is mixed with recirculated
cabin air in the ?

A

mixing box of either pack for distribution back to the cabin/flight
compartment ducts.

25
Q 
If either pack fails, airflow to
the cabin and flight
compartment will continue
from the operating pack. Air
from the operating pack
passes though the ?
A

baffle assembly to supply both the

cabin and flight deck.

26
Q 
As the cooled compressed air
passes through the ACM
turbine section it expands
which reduces its pressure as
well as further reducing its
temperature. This cooled air is
then discharged into ?
A

mixing box where it is
combined with recirculated
cabin air.

27
Q

The heat exchangers are

cooled by ?

A

ram air, ducted via
a baffle box into the aircraft
tail section by the dorsal fin
NACA ram inlet vents

28
Q

Water extracted by the
condenser is piped and
sprayed into the ?

A

the ram air duct to improve the efficiency of the heat exchanger.

29
Q

The desired conditioned air temperature is

achieved BY ?

A

By varying the blending ratios
of cold air to hot bypassed
bleed air. into the Mixing Box

30
Q 
The pack temperature control
valves regulate the
temperature of the air
discharged from the air
conditioning packs by ?
A

by opening and closing the
appropriate pack bypass and
throttle valves.

31
Q

The air recirculation system
draws air from the cabin and
flight compartment via ?

A

via air extraction ducts.

32
Q

Avionics compartment cooling is primarily

accomplished by means of an ?

A

accomplished by means of an avionics

cooling fan located under the floor.

33
Q

The avionics cooling fan operates whenever the ambient temp in the avionics rack is greater
than ?

A

35 degrees C

34
Q

Avionics cooling fan failure is indicated by ?

A

a warning light located on the
forward face of the flight attendant’s
control panel.

35
Q

If a malfunction occurs in the automatic
system, cabin and flight compartment
temperatures can be maintained with the ?

A

can be maintained with the

manual temperature control switches.

36
Q

If both air conditioning packs fail,

ventilation through the cabin and flight compartment is supplied through the ?

A

supplied through the

ram air duct in the dorsal fin.

37
Q

In the 200 The Duct Temperature Gauge only measures the ?

A

Cabin duct temperature.

Dash 8 Q300/200 (74 decks)

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