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Embraer 190 Technical > Air Management System > Flashcards

Air Management System Flashcards

1
Q

What are the Systems associated with the Air Management System (AMS)

A

Pneumatic System
Environmental Control System (ECS)
Cabin Pressure Control System (CPCS)

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1
Q

What is different about the CPCS (Cabin Pressure Control System)?

A

It has a separate controller

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2
Q

How many Channels does the AMS have?

A

2

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3
Q

What is the pneumatic system used for?

A

ECS
Engine Start
Engine and Wing Anti-Ice
Water Pressurisation

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4
Q

Where does the Pneumatic System get its Bleed Air?

A

Engines or APU

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5
Q

When is the Engine Bleed Valve opened?

A

Respective Bleed Switch AUTO
Respective Engine Bleed Available
No Fire detected
No Bleed Duct Leak

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6
Q

What does the ECS provide?

A

Pressurised & Conditioned air for the Flight Deck & Cabin
Filtered Cabin Air Recirculation
Air Supply for the Gaspers
Fan Air Cooling for Avionics
Emergency RAM Air Ventilation for Flight Deck Smoke Clearance
Cargo Bay Ventilation

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7
Q

When will the Gasper Shutoff Valve automatically OPEN?

A

When the Temperature of the Gasper Air Supply is 35°C +

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8
Q

What Supplies Air to the Gasper Ventilation System?

A

RIGHT recirculation fan

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9
Q

How many Ventilation fans are in the FWD, Centre & AFT Electronics Bay?

A

3, 3, NONE

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10
Q

Where do the ventilation fans draw their air from and to for the FWD Electronic Bay?

A

Cockpit > Underfloor Recirculation Bay

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11
Q

Where do the ventilation fans draw their air from and to for the Centre Electronic Bay?

A

Rear Cabin > Underfloor Recirculation Bay

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12
Q

How many ventilation fans are in the AFT Electronics Bay?

A

0

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13
Q

Why is the Forward Cargo Bay Ventilated? (NOT applicable at BACF)

A

To provide ventilation for live animals

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14
Q

Where are the Emergency RAM Air Valves located?

A

Pack 1 - Emergency RAM Air Valve
Pack 2 - Emergency RAM Air CHECK Valve

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15
Q

What is the purpose of RAM Air Ventilation?

A

To provide for smoke removal from the flight deck
OR
In the event of PACK Shutdown

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16
Q

When is the Emergency RAM Air Valve commanded OPEN?

A

Both Packs OFF
Both Packs FAIL
Altitude less than 25,000ft

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17
Q

What is the difference between the Emergency RAM Air Valve and the Emergency RAM Air CHECK Valve?

A

The Check valve does not require electronic control, and is commanded OPEN whenever the RAM air circuit is a greater pressure than the cabin

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18
Q

What are RAIDS?

A

RAM Air Inlet Doors, that modulate and optimise the quantity of RAM air sent to the packs via changes in their deflection

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19
Q

How many RAIDs are there?

A

2

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20
Q

How can the CPCS be operated and what is normal operation?

A

AUTOMATIC - Normal
MANUAL

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21
Q

What does the CPCS do?

A

Controls the Cabin Altitude, differential Pressure and Cabin Altitude Rate of Change

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22
Q

What is the nominal differential pressure below 37,000ft?

A

7.8psi

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23
Q

What is the max differential pressure?

A

8.4psi

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24
Q

How is the CPCS controlled manually?

A

Pilot must open or close the OUTFLOW Valve to maintain the desired Cabin Altitude, and there is no automatic cabin depressurisation on the ground after landing

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25
Q

When may a PACK be OFF? (Pack Flow Control Valve CLOSED)

A

Bleed Air Source Not available for the PACK
Bleed System Duct Leak
Associated PACK Button OFF
ANY Engine is starting ON GROUND
Associated Engine is starting IN FLIGHT
ANY Engine is start and the APU is the Bleed Source
PACK 1(2) FAIL ECIAS Message
RAM Air Valve BIT is running (PACK 1 OFF)

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26
Q

How is the CPCS automatically controlled in flight?

A

Logic is divided into Flight Modes

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27
Q

What are the CPCS Automatic Flight Modes?

A

Ground
Taxi
Takeoff
Climb
Cruise
Descent
Abort

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28
Q

What is the purpose of the CPCS Automatic Flight Modes?

A

To calculate a target cabin pressure from the outside pressure, max differential pressure limiter and a corresponding pressure rate of variation

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29
Q

During mode transitions or thrust lever transitions what happens to the CPCS?

A

Higher rates of pressure change might occur for a few seconds
Cabin pressure rate might be TWICE as much for a MAX of 5 seconds

30
Q

When is Abort Mode activated and what happens to the Cabin Pressurisation?

A

Activated when the aircraft stops climbing and immediately starts descending (Cruise mode never activated)
Pressure altitude is less than 10,000ft or aircraft is less than 5000ft

Cabin Pressure is scheduled back to take off altitude

31
Q

What is the Target Cabin altitude when Descent mode is activated?

A

Landing Field Elevation (Set in the FMS or manually)

32
Q

What will the Cabin Altitude be at 37,000ft or below?

A

8,000ft

33
Q

What is the Maximum Differential Pressure for Takeoff & Landing?

A

0.2psi

34
Q

What is the Max differential Negative Pressure?

A

-0.5psi

35
Q

What is the max differential overpressure?

A

8.8psi

36
Q

What happens if DUMP is selected?

A

Cabin depressurises to 12,400ft max Cabin Altitude
PACKS & Recirculation Fans OFF

37
Q

When is the DUMP function used?

A

Emergency Evacuation
Smoke Evacuation
Fast Cabin Depressurisation

38
Q

What does the CPCS Automatically do when the DUMP Button is pressed?

A

Outflow Valve controlled
ECS Packs & Recirculation Fans OFF
At 12,400ft Cabin Altitude, Outflow Valve is commanded Fully CLOSED

39
Q

What happens when the DUMP Button is pushed OUT after being pressed?

A

System commanded to normal:
ECS Packs ON
Recirculation Fans ON

40
Q

What are the components of the CPCS?

A

Cabin Pressure Controller (CPC)
1 x Cabin Outflow Valve
1 x Negative Pressure Relief Valve
1 x Positive Pressure Relief Valve
1 x Static Port

41
Q

When is the Negative Pressure Relief Valve Opened?

A

When the differential pressure exceeds -0.5psi

42
Q

How is the Negative Pressure Relief Valve Opened?

A

Spring Loaded, No Electrical Power Necessary

43
Q

What protects the aircraft structure against damage in the event of negative differential pressure?

A

Negative Pressure Relief Valve

44
Q

When does the Positive Pressure Relief Valve Open & How?

A

8.6psi (Not at the max 8.8psi)
Spring Loaded, no Electrical Power necessary

45
Q

How many channels does the CPC (Cabin Pressure Controller) have?

A

2 - alternated each flight

46
Q

What is the Airflow made up of?

A

52% Fresh Air & 48% Recirculated Air

47
Q

In an Abnormal Operation, when are the Recirculation Fans switched off?

A

BOTH PACKS OFF
On ground during Cabin Warm up with APU as the Bleed Air Source
Cargo Bay FIRE
DUMP Button Pressed
Smoke detected in the Recirculation Bay

48
Q

When are RECIRC FANS 1 & 2 Commanded OFF?

A

RECIRC FAN 1 -
ON GROUND, when Pack 1 is OFF and 2 is ON
IN FLIGHT, Speed is greater than 50kts and Pack 1is OFF
RECIRC FAN 2 - Never

49
Q

How many recirculation fans are there?

A

2

50
Q

How many Air Conditioning Packs are there?

A

2 - PACK 1 & 2

51
Q

What controls the Bleed Air to each pack?

A

AMS Controller, through a Flow Control Valve

52
Q

What Supplies Bleed Air to the Packs?

A

Respective Engine

53
Q

What are the Zones controlled by PACK 1 & 2 ?

A

Pack 1 - CKPT
Pack 2 - PAX Cabin
& are adjusted by the relevant selector knob

54
Q

How do both zones receive air if operating on a single PACK?

A

Via a Mixer

55
Q

What is the primary use for the APU Bleed System?

A

Ground pneumatic source for Air Conditioning PACKS and Engine Starting

56
Q

What can the APU Bleed System NOT bed used for?

A

Anti-Ice System

57
Q

What prevents Engine Bleed Air flowing to the APU when Engine Bleed Air is the Pneumatic Source?

A

APU Bleed Check Valve

58
Q

When is the APU Bleed Valve Commanded OPEN?

A

APU Switch AUTO
APU Bleed Available
NO APU/Left Bleed Duct Leak
Left Engine Bleed Unavailable
Wing Anti-Ice NOT Requested

59
Q

When can the APU supply Bleed Air and what controls it?

A

Both ON GROUND & IN FLIGHT
APU Bleed Valve controls bleed air flow to the pneumatic system

60
Q

When is the Crossbleed Valve commanded OPEN?

A

XBLEED Button AUTO
Bleed APU Button pushed OUT for engine Start
Engine 2 Start IN FLIGHT
APU Bleed OFF and Engine 1 Start IN FLIGHT
No Bleed Air source on the opposite side

61
Q

When is the Crossbleed valve commanded CLOSED?

A

Bleed Air Leak (Unless Engine Starting)
Engine Fire Handle Pulled
Manifold Side with Pressure above 90psi

62
Q

How is a Bleed Air overheat detected?

A

Dual Loop Sensors - when both loops detect an overheat

63
Q

What happens if a single Loop in the Bleed Air Overheat Detection system fails?

A

Nothing, monitors as a single Loop

64
Q

What is the priority order for Bleed Air?

A

Onside Engine, Offside Engine, APU

65
Q

When is APU Bleed given Priority?

A

ON GROUND
APU ON
APU Bleed & Crossbleed Buttons AUTO
Valves Operating Normally
Ground Speed below 50kts, and 30 seconds have passed since touchdown
REF ECS is OFF and REF A/I is not ALL
Aircraft is single engine taxiing

66
Q

When will Engine Bleed will be unavailable and the APU supply Bleed to both PACKS?

A

Ground speed greater than 50kts when taxiing with the LEFT engine only

67
Q

When is the Engine Bleed given priority?

A

Engine Bleed AVAILABLE
Crossbleed Valve operating normally
ENG REF ECS ON

68
Q

What type of start does the AMS Controller prioritise during Engine Start with Anti-Ice?

A

Cross Bleed Start

69
Q

When is the Engine Bleed System shutdown in an abnormal operation?

A

Bleed Leak
Overpressure
Failure

70
Q

How does the Engine Bleed System Work?

A

Alternatively selects between low and high pressure engine bleed source to maintain adequate and safe bleed supply pressure

71
Q

How is Engine Bleed Temperature Regulated?

A

Precooler

72
Q
A

Embraer 190 Technical (20 decks)

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