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ERJ > Air Management System > Flashcards

Air Management System Flashcards

1
Q

The Air Management System (AMS) consists of:

A

(1) The Pneumatic System.
(2) The Environmental Control System (ECS)

The Cabin Pressure Control System (CPCS) is part of the AMS, but it has a separate controller

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2
Q

The AMS controller provides primary control for various airplane subsystems such as _________. The AMS controller also interferes with the ________

A

bleed control, air conditioning control, hot air leak detection, crew oxygen monitoring and wing and engine ice protection.

smoke detectors providing fault detection, isolation, and reporting

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3
Q

The AMS controller has ___channels. In case of a channel failure, the remaining channel is able to control the entire pneumatic, air conditioning and anti-ice systems

A

two

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4
Q

PACK 1 (2) BUTTON
PUSH IN:

PUSH OUT:

A

PUSH IN: allows automatic operation by the AMS. This position opens the respective pack flow control valve.

PUSH OUT: manually closes the respective pack flow control valve.

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5
Q

RECIRCULATION BUTTON
PUSH IN:

PUSH OUT:

A

PUSH IN: allows automatic operation by the AMS. This position turns on both recirculation fans, according to system operational logic.

PUSH OUT: turns off both recirculation fans.

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6
Q

CROSS-BLEED BUTTON
PUSH IN:
PUSH OUT:

A

PUSH IN: allows automatic operation by the AMS. This position opens the cross-bleed valve, according to system logic.

PUSH OUT: manually closes the cross-bleed valve.

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7
Q

BLEED AIR BUTTON
PUSH IN:
PUSH OUT:

A

PUSH IN: allows automatic operation by the AMS. This position commands the respective engine bleed valves, according to system logic.

PUSH OUT: manually closes the engine bleed valves.

When leak is detected, the button amber striped bar is
illuminated.

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8
Q

APU BLEED BUTTON
PUSH IN:
PUSH OUT:

A

PUSH IN: allows automatic operation by the AMS. This
position commands the APU bleed valve, according to system logic.

PUSH OUT: closes the APU bleed valve.

NOTE When leak is detected, the button amber striped bar is illuminated.

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9
Q

DUMP BUTTON (GUARDED)
Momentary pushbutton:

A

(a) Provides rapid cabin depressurization, by opening the outflow valve and commanding the packs and recirculation fans to off.

(b) When pressed the dump function is activated and a white striped bar illuminates on the button. When pressed a second time the system returns to normal.

NOTE When operating in manual mode, the outflow valve will not be commanded open.

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10
Q

CABIN ALTITUDE SELECTOR KNOB
DOWN:

STOP:

UP:

A

CABIN ALTITUDE SELECTOR KNOB
DOWN: (momentary action) manually closes the outflow valve.

STOP: normal operation position.

UP: (momentary action) manually opens the outflow valve.

NOTE Manual actuation of the outflow valve is possible only with the PRESSURIZATION MODE SELECTOR KNOB set to MAN position.

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11
Q

PRESSURIZATION MODE SELECTOR KNOB
MAN:

AUTO:

LFE CTRL:

A

MAN: allows manual control of the outflow valve.

AUTO: allows automatic operation of the pressurization system.

LFE CTRL: allows manual input of landing field elevation, although the pressurization system will remain in automatic mode

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12
Q

LANDING FIELD ELEVATION (LFE) SELECTOR KNOB
DOWN:

STOP:

UP:

A

DOWN: (momentary action) decreases the LFE in 100 ft
increments.

STOP: normal operation position.

UP: (momentary action) increases the LFE in 100 ft
increments.

NOTE Manual input of the LFE is possible only with the
PRESSURIZATION MODE SELECTOR KNOB set to LFE
CTRL position.

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13
Q

Bleed air is provided to the Air Management System by the engines, or the APU.
The bleed air is used for:

A

(1) Environmental Control System (ECS);
(2) Engine start;
(3) Engine anti-ice and wing anti-ice;
(4) Water pressurization

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14
Q

Recirculation Fans
Recirculated air from the passenger cabin and cockpit is ducted to the mixing manifold via two recirculation fans located in the pressurized section of the airplane. The recirculation fans draw air from the recirculation bays and impel the air back into the flight deck and cabin distribution system.
The total flow entering the cockpit and the passenger cabin is made up of approximately __% of fresh air and __% of recirculation air.

A

52

48

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15
Q

The recirculation fans are commanded OFF when:

A

(a) Both packs are commanded OFF;
(b) During on ground, cabin warm-up mode with the APU as bleed source according to a function of ambient temperature and altitude;
(c) The cargo bay fire signal activates;
(d) The DUMP button is pressed;
(e) Smoke is detected in the recirculation bay

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16
Q

CABIN PRESSURE CONTROL SYSTEM
A. General
(1) The Cabin Pressure Control System (CPCS) controls cabin pressurization and provides maximum safety and comfort during every segment of flight and ground operations.
(2) The CPCS operates in automatic and manual modes. Normal operation of the CPCS is automatic.
(3) The system consists of:

A

(a) Cabin pressure controller (CPC).
(b) One cabin outflow valve (OFV).
(c) One negative pressure relief valve (NPRV).
(d) One positive pressure relief valve (Safety valve).
(e) Static Pressure Port.

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17
Q

the pneumatic system sources are

A

engine bleed air
APU bleed air
or external pneumatic source (cart)

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18
Q

the main source of bleed air for the pneumatic system

A

are the engines

19
Q

the main source of bleed air for the pneumatic system

bleed air is taken from two different compressor stages

A

are the engines

low pressure (high power setting) port at stage #6 and high pressure (low power setting) port at stage #10

20
Q

Precooler

A

cools hot bleed air by fan air on ground or ram air or fan air in flight

21
Q

if more than one bleed source is available, the AMS logic uses the following priority

A

onside engine
opposite engine
APU if activated

22
Q

when smoke is detected on forward cargo compartment ventilation system

A

fan operation is terminated

the check valve closes by mechanical springs

the cargo outflow valve is commanded closed by AMS controller when smoke is detected in the forward cargo compartment

23
Q

CABIN ALTITUDE HI warning is generated whenever the cabin altitude rises above

A

9,700 feet

24
Q

ENGINE BLEED SYSTEM
The system will automatically shut down the affected bleed system by closing the engine bleed valves when a leak, overpressure or fail condition is identified.

A

…

25
Q

The APU supplies bleed air on the ground or inflight. However, it is used primarily as a ground pneumatic source for the air conditioning packs (ECS) and engine
starting. The APU Bleed Check Valve prevents engine bleed air from flowing to the APU when the engine bleed is the pneumatic source

A

…

26
Q

OVERHEAT DETECTION SYSTEM
A. The Overheat Detection System (ODS) consists of overheat sensors and electronic control which provide rapid and reliable overheat and leak detection for
the engine bleed, air conditioning ducts, APU bleed air distribution and anti-ice supply ducting.
B. Normally the overheat sensors use dual loop sensing. In this configuration and overheat is indicated only when both loops detect an overheat condition.
C. If a single loop fails, the remaining will monitor for an overheat condition (single loop operation)

A

…

27
Q

The APU bleed cannot be used for the anti-ice system operation.

A

…

28
Q

ENVIRONMENTAL CONTROL SYSTEM
A. General
(1) The Environmental Control System (ECS) provides pressurized and conditioned air for the flight deck and passenger cabin, filtered cabin air recirculation, conditioned air supply for gaspers, fan air cooling for avionics and emergency ram air ventilation for flight deck smoke clearance.

A

…

29
Q

Each engine normally supplies bleed air to the respective pack. A single pack is capable to keeping adequate cabin/cargo hold pressurization and temperature. Single engine bleed can supply both ECS packs using the cross bleed.

A

…

30
Q

Gasper Ventilation
(1) The gasper air distribution system provides air to each pilot and passenger position. Air flowing from the mixing manifold through the gasper check
valve supplies the gasper ventilation system.

A

…

31
Q

The recirculation fans draw air from the recirculation bays and impel the air back into the flight deck and cabin distribution system.
The total flow entering the cockpit and the passenger cabin is made up of approximately 52% of fresh air and 48% of recirculation air

A

…

32
Q

The recirculation fans are commanded OFF when:

A

(a) Both packs are commanded OFF;
(b) During on ground, cabin warm-up mode with the APU as bleed source according to a function of ambient temperature and altitude;
(c) The cargo bay fire signal activates;
(d) The DUMP button is pressed;
(e) Smoke is detected in the recirculation bay.

33
Q

The ECS provides ventilation for live animals in the forward cargo bay.

A

…

34
Q

Emergency Ram Air Ventilation ( I believe these are the scoops under the aircraft)

(1) Emergency ram air ventilation is provided in case of pack shutdown or for smoke removal.
(2) The flight deck pack emergency ram air ventilation valve is commanded OPEN only if both ECS cooling packs are commanded OFF or failed OFF
and the plane’s altitude is less than 25000 ft.
(3) An emergency ram air ventilation check valve is provided and does not require electronic control. The emergency ram air check valve will be open
whenever the pressure in the ram air circuit is greater than cabin pressure.
(4) During smoke removal, both ECS cooling packs will be commanded OFF and therefor, the flight deck emergency ram air ventilation valve will be
commanded OPEN.

A

…

35
Q

AMS Controller functional logic provides automatic control of engine bleed, APU bleed, ECS packs, Anti-Ice systems, Pressurization and recirculation bay smoke detection according to the airplane’s operation and condition

A

…

36
Q

Cabin Pressure Controller (CPC)
(1) The basic function of the controller is to control cabin pressure by commanding the outflow valve to modulate airflow through the valve from the pressurized airplane volume to the surrounding environment.
(2) The CPC has two fully independent automatic channels, which are alternated following each flight.
(3) Both channels provide a manual function as backup, enabling the crew to control cabin pressure by directly actuating the outflow valve (OFV)
position.

A

…

37
Q

Outflow Valve (OFV)
The outflow valve modulates airflow from the pressurized cabin into surrounding
environment. It can be modulated automatically or manually.

A

…

38
Q

Negative Pressure Relief Valve (NPRV)
(1) The negative pressure relief valve is a spring loaded check valve that works without any electrical power, and is independent of the CPCS. Its
function is to protect the airplane structure against damages due to a negative differential pressure.
(2) The negative pressure relief valve opens if differential pressure between cabin and surrounding environment exceeds -0.5 psi.

A

…

39
Q

Positive Pressure Relief Valve (Safety Valve)
The positive pressure relief valve is a spring loaded check valve that works without any electrical power, and is independent the CPCS. Its function is to protect
the airplane’s structure against damage due to positive overpressure. In case of outflow valve failure, the positive pressure relief valve opens if the pressure differential between cabin and surrounding environment exceeds 8.6 psi.

A

…

40
Q

Static Pressure Port
(1) The static pressure port senses the environment static pressure and mechanically transmits it to the positive pressure relief valve in order to
allow the overpressure relief device to work.
(2) The static port is electronically heated to assure there are no obstructions of sensing orifices due to ice accumulation.

A

…

41
Q

Dump Function
The CPCS system automatically:
(a) Sets the ECS packs and recirculation fans to OFF;
(b) Controls the OUT FLOW VALVE to maintain the cabin altitude rate of climb at 2000 ft/min up to 12400 ft.
(c) When the cabin altitude reaches 12400 ft it commands the OUT LOW VALVE full closed. From this point the cabin altitude rises by natural leak.
If the cabin altitude is above 12400 ft when the dump is activated, the cabin altitude may be rising due to a normal leak. To achieve a higher rate of
climb the manual mode can be used.

A

…

42
Q

If the FMS cruise altitude is set below 37000 ft the nominal differential pressure is set to a maximum of 7.8 psid and at 37000 ft the cabin altitude will be 8000 ft.

If either the FMS cruise altitude is set higher than 37000 ft or the airplane is actually flying above 37000 ft the nominal differential pressure is set to a maximum of 8.4 psid

A

…

43
Q

the ECS packs are recovered if thrust levers are not set to MAX position and any of the following conditions occur:

A

thrust lever reduction

TWO ENGINES
the airplane is 500 ft above takeoff field altitude

ONE ENGINE
the airplane is above 9,700 ft during go around

above 9,700 ft, for takeoff fields at 8,000 ft or below

above 15,000 ft, for takeoff fields above 8,000 ft

ERJ (30 decks)

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