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Dash 8 Q300/200 > Pressurisation > Flashcards

Pressurisation Flashcards

1
Q

Selecting DUMP on the pressurisation control panel will result in what ?

A

The normal outflow valves opening fully.

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2
Q

How many normal outflow valves are located on the 200 ?

A

1

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3
Q

If the Cab alt setting on the overhead pressurisation control panel is lower than the destination elevation, what will happen to the cabin on touchdown ?

A

The cabin will be pressurised at touchdown

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4
Q

When does the CABIN PRESS warming light illuminate ?

A

Cabin altitude exceeds 10,000ft

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5
Q

A successful cabin pressure controller test is indicated by what ?

A

The amber FAULT light illuminating for two seconds, then extinguishes

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6
Q

With the RATE knob on the pressurisation control panel set to the index mark/ detent position, what are the normal rates of cabin climb and descents that can be expected ?

A

500 fpm climb, 300 fpm descent

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7
Q

Selecting MANUAL on the pressurisation control panel will cause ?

A

The normal outflow valves to close.

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8
Q

Maximum cabin ROC and ROD?

A

2500 +/- 150 fpm ROC

1500 +/- 150 fpm ROD

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9
Q

The normal outflow valves are modulated by which of the following means ?

A

Metered suction provided by de ice pressure against spring pressure.

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10
Q

For fully automatic operation, which of the following pressurisation control panel selections is accurate?

A

Mode selectors to AUTO/NORM, Cab alt display set to destination elevation.

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11
Q

If the cab alt setting on the overhead pressurisation control panel is higher than the destination elevation, what will occur at touchdown ?

A

The cabin will be fully depressurised prior to touchdown.

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12
Q

Maximum pressure differential is what ?

A

5.95 psi

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13
Q

What are the four pressurisation modes ?

A

Fully automatic, semi automatic, manual and dump

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14
Q

Positioning the FWD OUTFLOW VALVE lever to OPEN performs what function ?

A

Admits unmetered suction past the manual metering valve to fully open the safety outflow valve.

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15
Q

During normal operations the cabin pressure controller functions to keep the cabin pressure differential to a maximum of what ?

A

5.5+/- 0.3psi

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16
Q

How many outflow valves are installed in the 300 ?

A

3

17
Q

The maximum cabin pressure differential permitted for takeoff or landing is what ?

A

0.5 psi

18
Q

Where is the safety outflow valve located ?

A

Forward pressure bulkhead

19
Q

If the aircraft lands and is still pressurised what will occur ?

A

The cabin will depressurise at a rate of 600fpm for one minute then the normal outflow valves will fully open.

20
Q

The cabin pressure controller modulates the normal outflow valves how ?

A

Electrical signal to the metering valve to vary the amount of suction pressure acting on the poppet valve

21
Q

Where are the normal outflow valves located ?

A

Rear pressure bulkhead.

22
Q

The pressurisation system
regulates cabin pressure
by ?

A

metering excess
conditioned air overboard
through outflow valves

23
Q

In the automatic modes,
the Cabin Pressure
Controller receives inputs
From ?

A
  • Cabin pressure sensor
  • Ambient pressure
    sensors
  • Weight on wheel
    switches
  • Power lever position
  • Cabin Altitude Selector
24
Q

A third valve, the forward

safety outflow valve uses what for its suction ?

A

Slipstream air

25
Q

When on the ground with
power levers retarded, the
cabin pressure controller is
in ground mode and holds ?

A

the normal outflow valves
open to prevent
pressurisation.

26
Q

When the power levers are
advanced for take-off the
normal outflow valves are
positioned so as to ?

A 
pressurise the aircraft to
140 feet below ambient.
This is done to move the
outflow valves off their full
open stops and start
modulating.
27
Q

At lift-off, the proximity
switch electronics unit
(PSEU) switches the cabin
pressure controller to ?

A

to its normal pressurisation

scheduling program.

28
Q

The semi automatic operation is for
major corrections in pressurisation
due to ?

A

due to diversions, steep descents

and abnormal flight profiles.

29
Q

Adjusting the pressurisation knob fully counter- clockwise will ?

A

decrease cabin rate of

climb and descent to zero.

30
Q

Both the normal and safety outflow
valves contain pressure relief valves
Which ?

A

which vent excess pressure should
cabin pressure exceed the sensed
ambient air pressure by 5.8psi +/-
0.15.

31
Q

Protection from negative pressure is

provided by ?

A

relief valves in the
normal outflow valves which
automatically open if the interior
suction exceeds 0.1 psi.

Dash 8 Q300/200 (74 decks)

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