Aircraft Air Conditioning Systems Quiz

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Questions and Answers

Conditioned air is distributed to:

Cockpit, avionics bay and cabin (correct)

Cockpit, cargo bays and cabin

Cockpit, cabin and holds 1 and 2 only

Cockpit, fwd and aft cabins

Hot air fault light illuminates on the air conditioning panel, what happens?

The hot air press. reg. valve opens and the trim air valves open.

The hot air press. reg. valve closes and the trim air valves open.

The hot air press. reg. valve closes and the trim air valves close. (correct)

The hot air press. reg. valve opens and the trim air valves close.

Does the trim air provide the warm air or the cold air to the air conditioning system?

Warm air

Cold air (correct)

In case of zone controller primary and secondary channel failure, what temperatures are maintained by pack one and pack two?

24 deg.C for pack one and 15 deg.C for pack two Signup and view all the answers

In normal flight in closed circuit configuration, the avionics ventilation system controls the temperature of the cooling air by

Adding air conditioned air to the flow Signup and view all the answers

To enable Ram air to the mixture unit, The Ram air switch should be used:

Only when differential pressure is less than 1 psi. Signup and view all the answers

Pack controller, primary channel failure.

The secondary computer takes over (all functions as normal) Signup and view all the answers

Pack controller, secondary channel failure.

No effect on pack regulation backup mode is lost Signup and view all the answers

Pack controller, primary and secondary channel failure.

Pack outlet temperature is controlled to between 5 and 30 deg.C by the anti-ice valve Signup and view all the answers

Hot air press. reg. valve failed open:

Optimized regulation is lost Signup and view all the answers

Bleed air supplied from the APU (APU bleed valve open), the pack flow is automatically selected:

High Signup and view all the answers

Trim air valve, each one optimizes the temperature by:

Modulating of pack flow Signup and view all the answers

Hot air pressure regulating valve:

Regulates the pressure of hot air tapped upstream of the packs Signup and view all the answers

Pack flow control valve:

Is pneumatically operated and electrically controlled Signup and view all the answers

Engine flow demand, when the heating or cooling demand in one zone cannot be satisfied:

The minimum idle is increased automatically Signup and view all the answers

What is the Norm.Max. cabin altitude?

9,550 ft +/- 350 ft Signup and view all the answers

What is the Max. negative Diff. pressure for the cabin?

1 psi. Signup and view all the answers

It is permissible to use simultaneously packs and Lp ground unit during long stops in a hot airfield

Yes, provided the airflow supplied by the ground cart is less than 1.2 kg/ s Signup and view all the answers

What are the different sources of air for air conditioning and pressurization?

Engine bleed air and recirculated air, or if selected, APU bleed air and recirculated air. Signup and view all the answers

During the exterior preflight on a warm day, in what position would you expect to find the avionics ventilation system INLET and EXTRACT valves to be in?

Closed. Signup and view all the answers

What happens to the pack flow control valves during engine start?

They automatically close. Signup and view all the answers

The temperature of each aircraft zone is optimized by means of:

A ZONE control valve. Signup and view all the answers

When does normal pressurization occur?

After rotation. Signup and view all the answers

Under what conditions should the pack flow controller be set to LO?

With a low passenger load to reduce bleed air demand and improve fuel efficiency. Signup and view all the answers

Which statement is correct regarding illumination of the amber AFT ISOL VALVE fault light?

Means that either the inlet or outlet isolation valve(s) disagrees with the switch position. Signup and view all the answers

Pressurization controllers receive inputs from:

LGCIU, ADIRU, FMGS, and EIU. Signup and view all the answers

What computers control the cabin and cockpit conditioned air?

Two zone controllers that pass information and requests to two pack controllers. Signup and view all the answers

When would you select RAM AIR ON?

Dual pack failure or smoke removal. Signup and view all the answers

What happens when a temperature selector rotary knob is adjusted?

The associated trim air valve immediately moves to a different position. Signup and view all the answers

With APU BLEED ON and engine BLEED switches ON with engines running, what is the position of the engine bleed valves?

Depends on the crossbleed selector Signup and view all the answers

Pressurization is normally automatic. Can you interfere with it?

Both are correct. Signup and view all the answers

Hot air fault light illuminates on the air conditioning panel, which of the following occurs?

The hot air press. reg. valve opens and the trim air valves close. Signup and view all the answers

Study Notes

Question 1

Conditioned air is distributed to the cockpit, cargo bays, and cabin, and holds 1 and 2 only.

Question 2

If the hot air pressure regulator valve opens and the trim air valves close, the hot air fault light illuminates on the air conditioning panel.

Question 3

Trim air provides cold air to the air conditioning system.

Question 4

In case of zone controller primary and secondary channel failure, 24 degrees Celcius for pack one and 15 degrees Celcius for pack two are maintained.

Question 5

In normal flight, the avionics ventilation system controls the cooling air temperature by passing air through a skin heat exchanger.

Question 6

To enable ram air to the mixture unit, the ram air switch should be used when differential pressure is less than 1 psi.

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Description

Test your knowledge on the intricate workings of aircraft air conditioning systems. This quiz covers topics including conditioned air distribution, temperature control in different zones, and the function of various valves and switches. Ideal for aviation students and professionals looking to refresh their understanding.