Air Conditioning / Presurization Flashcards

1
Q

Max pressure differential is

A

8.7 psi

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2
Q

Max pressure differential during taxi, takeoff and landing

A

O.1 psi

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3
Q

Max negative pressure differential

A
  • 0.5 psi
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4
Q

During single PACK operation, what is the max altitude

A

CRJ-900 FL 250

CRJ-700 FL 310

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5
Q

What does the DISPLAY COOL or ARINC COOL caution message mean

A

Low airflow behind screens or within the avionics rack

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6
Q

How many pressurization controllers are installed on the CRJ-900

A

2, PC1 and PC2

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7
Q

When do the pressurization controllers swap

A

Weight on wheels plus 3 minutes or if one PC fails the redundant controller takes over

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8
Q

When operating in the auto mode what is the cabin rate of climb and descent

A

500 fpm climb 300 fpm descent

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9
Q

When operating in the manual mode what range is controlled by the MAN RATE knob

A

50 fpm to 3000 fpm -+ 1000

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10
Q

When will the primary page indicate a CABIN ALT caution message

A

Cabin altitude between 8,500-10,000ft

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11
Q

When will the primary page indicated a CABIN ALT warning message

A

Cabin alt > 10,000ft

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12
Q

When will CPAM automatically deploy the passenger oxygen masks

A

Cabin alt > 14,000 ft

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13
Q

When will CPAM turn on the NO SMOKING/FASTEN SEAT BELT sign

A

Cabin alt > 10,000ft (with switches in the auto position)

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14
Q

Can we carry live animals in the cargo compartment of the CRJ-900

A

Yes, aft cargo compartment only (heated)

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15
Q

What causes the FAULT portion of a pack switch light to illuminate

A

Over pressure or over temperature condition

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16
Q

What causes the FAULT portion of the PRESS CONT switch-light to illuminate

A

Both pressurization controllers have failed

17
Q

Normal pressure differential is

A

8.5 psi