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EJET ELEVACAO > Air Management System (AMS) > Flashcards

Air Management System (AMS) Flashcards

1
Q

Define CPCS

A

Cabin Pressure Control System

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2
Q

What does the AMS control?

A

-Engine Bleed Control
-APU Bleed Control
-Environmental Control
-Hot Air Leak Control
-Crew Oxygen Monitoring
-Wing Ice Protection
-Engine Anti-Ice

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3
Q

How many channels does the AMS have?

A

Has 2 channels. In case of channel failure, the other channel is able to control the entire pneumatic, air conditioning and anti-ice system.

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4
Q

Can APU bleed be used for anti-ice?

A

No! APU bleed air connects directly to the left bleed manifold, and is available to the right bleed manifold through the x-bleed valve. It cannot be used for the anti-ice system.

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5
Q

Bleed source priorities

A

-Onside engine
-Opposite engine
-APU, if activated

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6
Q

When does the APU bleed have priority over the engine bleed?

A

When the engine and APU bleed are available simultaneously, the AMS gives priority to APU supply when the following conditions are simultaneously met:
• The airplane is on the ground.
• The opposite engine bleed pressure is below the minimum for engine start.
• Ground speed is below 50 kt.
• The cross bleed valve is operating normally.

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7
Q

When is the Enngine Bleed Valve commanded open?

A

The Engine Bleed Valve is commanded open when the following conditions occur simultaneously:
• Respective bleed switch is set to AUTO.
• Respective engine bleed is available.
• No fire is detected in the respective engine.
• No bleed duct leak is detected

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8
Q

When is the APU Bleed Valve commanded open?

A

The APU Bleed Valve is commanded open when the following conditions occur simultaneously:
• APU switch is set to AUTO.
• APU Bleed is available.
• No APU and left bleed duct leak.
• Left engine bleed is unavailable.
• Anti-ice system not requested (or anti-ice system requested ON and anti-ice system is failed)

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9
Q

When does the 9th stage HP air operate?

A

When the 5th stage pressure or temperature is not adequate, the 9th stage valve automatically opens to supply the system with high pressure bleed air from the 9th stage. Therefore, at high thrust settings, the 9th stage is normally closed, but normally open at low thrust settings.

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10
Q

Is the APU used for ANTI ICE operations?

A

No!

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11
Q

Difference between External Low Pressure and High Pressure power?

A

Los pressure air feeds into the air ducts and not to the pneumatic system. High pressure air is provided to the pneumatic system to operate pneumatic powered systems when engine or APU bleed air are not available

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12
Q

MIN pressure for X BLEED and EXTERNAL AIR start

A

X BLEED: 40 PSI - 0,5 PSI P/ 1000FT ELEVATION

Normal start/ LPU start: 33 PSI - 0,5 PSI p/ 1000ft elevation

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13
Q

DUMP FUNCTION

A

Depressurize s to max of 12,400 ft at a max rate of 2000ft p/min

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14
Q

Cabin High Altitude

A

9700 ft

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15
Q

How many electronic bays are there?

A

3 e-bays

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16
Q

How many fans does the forward e-bays have?

A

3 dfans, which provide cooling air or the #1 secondary power distribution assembly (SPDA 1). The fans draw air from the cockpit and expel air toward the recirculation bay

17
Q

How is the cooling in the aft e-bay?

A

Forced cooling airflow is not necessary. There is no fan installed in this compartment. Natural cooling airflow is provided through the passenger cabing to provide cooling of the aft e-bay and expelled towards the underflow recirculation bay.

18
Q

How many RAM air valves are there and what are their functions?

A

2 ram air valves are provided in the pack ram air cooling ducts. They provide forced airflow through the cockpit and cabin when the aircraft is not pressurized.

19
Q

When is the RAM AIR VALVE automatically opened?

A

Under the following conditions:

  • In Flight
  • Air Conditioning Packs Commanded OFF
  • Altitude is Less than 25,000 ft
20
Q

What is the gasper air distribution for?

A

Distributes air to each pilot and passenger positions through nozzles

21
Q

When does the gasper shutoff valve open?

A

When the gasper air supply exceeds 35 Celcius

22
Q

When does the wing anti ice activate on ground?

A

Wheel Speed greater than 40 KTS

23
Q

Under what condition do we set the REF A/I ENG on the MCDU

A

10C > OAT > 5C and:
1. Icing conditions
2. Ceiling less than 1,700 ft

24
Q

What supplies the engine anti ice?

A

Bleed air from the respective engines low stage valve

25
Q

Windshield wiper cycles

A

LOW - 80 cycles per minutes

HIGH - 125 cycles per minute

TIMER - 8 secs

26
Q

When does the Flow Control Valve (FCV) close?

A

Whenever any engine is starting and the weight on wheels logic detects the aircraft is ont he ground. Dedicated the bleed air to the started of the engine

27
Q

Composition of cockpit and passenger air

A

Due to recirculation fans, 52% fresh air and 48% recirculated. Causes less fuel consumption due to smaller bleed demand on the engines

28
Q

What is the CPCS

A

Ccabin Ppressure Ccontrol System

29
Q

What does the CPCS consist of?

A
  • Cabin outflow valve (OFV)
  • Cabin Pressure Controller (CPC)
  • 1 positive pressure relief valve ( safety valve)
  • Static Pressure Port
  • 1 Negative pressure relief valve (NPRV)
30
Q

When does the Cabin Altitude display in RED?

A

9,700ft or higher

31
Q

When does the Positite Pressure Relief Valve open?

A

When the differential pressure between the cabin and outside exceeds 8.6 psi.

32
Q

When does the Negative pressure relief valve open?

A

When the differential pressure between cabin and surround environment exceeds -0,5 psi

33
Q

Normal Cabin altitude during flight

A

8,000 ft. Higher indications may be due to abnormal conditions

34
Q

What happens if the DUMP pushbutton is pressed a second time?

A

The system returns to normal.

35
Q

For how long does the anti ice system still operate after no more ice is detected?

A

5 minutes

EJET ELEVACAO (17 decks)

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