21 - Air Conditioning Flashcards

1
Q

What are the main air sources for the ACS?

A

Bleed air from engines, the Auxiliary Power Unit (APU), or a ground air supply.

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2
Q

What is the role of the mixer unit in the ACS?

A

Combines conditioned air from the packs with recycled air and mixes hot air from the bleed system to achieve the selected temperature.

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3
Q

How does the emergency ram air system function?

A

If both packs fail, the emergency ram air inlet opens when differential pressure is below 2 PSI, providing external air to the mixer unit for ventilation and cooling.

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4
Q

What does the Supplemental Cooling System (SCS) cool?

A

Galleys and the Avionics Ground Cooling Unit.

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5
Q

Which CPIOMs control the SCS?

A

CPIOMs H43 and H44.

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6
Q

What happens if one cooling unit in the SCS fails?

A

The system performance is degraded but continues operating with reduced capacity.

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7
Q

How is temperature in the cabin controlled?

A

Adjusted via the CABIN selector on the AIR panel or by the cabin crew through the Flight Attendant Panels (FAPs).

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8
Q

What is the purpose of the AIR FLOW selector?

A

Adjusts airflow from the packs and recirculated cabin air, with automatic and manual modes to suit passenger load and altitude.

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9
Q

How does the trim air system enhance temperature regulation?

A

Adds hot air from the bleed system to the mixed air for precise temperature control in specific zones.

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10
Q

What is the temperature regulation capability of the bulk cargo compartment?

A

It can only heat, not cool, and uses an electrical heater to maintain the desired temperature.

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11
Q

Which cargo compartment can be cooled, and how is it controlled?

A

The forward cargo compartment can be cooled using air from the ACS, controlled via the FWD TEMP REGUL selector on the CARGO AIR COND panel.

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12
Q

What happens during a SMOKE AFT/BULK CARGO SMOKE alert?

A

Isolation valves close automatically, and the heater and extraction fan stop to contain the smoke.

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13
Q

What does the PACK FAULT light indicate?

A

Indicates:
- Disagreement between pack valve positions and commands.
- Pack overheating or failure.
- Bleed air leak.

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14
Q

Which component adjusts airflow based on passenger load and altitude?

A

The pack controllers.

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15
Q

What information is displayed on the BLEED SD page?

A

Displays pack valve states, pack airflow rates, and bleed air supply status.

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16
Q

What occurs when the ACM fails?

A

The pack operates in bypass mode using only the heat exchanger, resulting in degraded performance, especially above FL 220.

17
Q

How does a jammed Trim Air Valve affect cabin zones?

A

If closed, temperature regulation is lost in the affected zone. If open, nearby zones may experience slightly degraded regulation.

18
Q

What action is required if a pack overheats due to an ACM failure?

A

The affected pack must be set to OFF.