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Dash 8 Q400 2 > Air Conditioning and Pressurization > Flashcards

Air Conditioning and Pressurization Flashcards

1
Q

Air conditioning packs are part of the Environmental Control System (ECS)
- Air Conditioning system consists of: (5)

A
  • 1 Bleed air system for each engine
  • 2 Integrated air conditioning packs
  • 1 Auxiliary Power Unit (APU)
  • Air distribution and recirculation duct systems
  • ECS Electronic Control Unit (ECU)
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2
Q

Recirculation Fans

  • Fan is located in the
  • When initially selected to RECIRC (ON), the fan begins operating at
  • Fan draws air from the ___ and sends it to the air distribution ducts for the cabin and flight deck
A
  • Fan is located in the ACM service bay
  • When initially selected to RECIRC (ON), the fan begins operating at “slow” speed. The ECU automatically selects high speed when required
    • Recirc fan is designed to operate at “slow” speed during engine start-up and during single ACM operations
  • Fan draws air from the aft cargo compartment and sends it to the air distribution ducts for the cabin and flight deck
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3
Q

Bleed Switches (Overhead Panel)

  • 2 “Bleed Switches” on the overhead panel referred as (1) & (2)
  • (1) & (2) - Enables the operation of the ___ AND the ___ shutoff valve and allows bleed air to flow into the pneumatic system
  • ___ is located downstream or closest to each engine bleed air exhaust
  • OFF – Shuts off the associated bleed air flow by closing the ___ and the ___ shutoff valve
A
  • 2 “Bleed Switches” on the overhead panel referred as (1) & (2)
    o (1) & (2) - Enables the operation of the Nacelle Shutoff Valve AND the P2.2 shutoff valve and allows bleed air to flow into the pneumatic system
    • NSOV is located downstream or closest to each engine bleed air exhaust
    o OFF – Shuts off the associated bleed air flow by closing the NSOV and the P2.2 shutoff valve
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4
Q

Bleed Control Selector (Overhead Panel)
- Bleed Control Selector” has 3 positions:
o MIN - Environmental Control System (ECS) modulates the amount of bleed air from BOTH engines at a
o NORM, MAX – ECS modulates the amount of bleed air from BOTH engines at

A
  • “Bleed Control Selector” has 3 positions:
    o MIN - Environmental Control System (ECS) modulates the amount of bleed air from BOTH engines at a minimum level
    o NORM, MAX – ECS modulates the amount of bleed air from BOTH engines at increased levels
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5
Q

Duct Temperature Selector (knob)
- Knob is used to select the desired duct temperature to be displayed on the “Duct Temperature” gauge (overhead panel)
o CABIN DUCT – displays
o CABIN – displays ___ (sensor located @ ___)
o FC DUCT – displays

A
  • Knob is used to select the desired duct temperature to be displayed on the “Duct Temperature” gauge (overhead panel)
    o CABIN DUCT – displays Cabin air supply duct temperature
    o CABIN – displays Cabin zone temperature (sensor located @ mid cabin)
    o FC DUCT – displays Flight Compartment air supply duct temperature
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6
Q

Pack Control Switches (toggle - three positions)
- AUTO – When the switches are selected to AUTO the ECU’s ___ channels control the operation of the pack ___ and the respective ___ (in response to manual inputs) to automatically regulate cabin or flight compartment temperatures
- Temperature control is based on feedback indication from ___
o CABIN & FLT COMP Temp Selector when set in AUTO:
- Full Counter Clockwise – Full COLD: ECU will maintain a cabin temp of ___
- Full Clockwise – Full WARM: ECU will maintain a cabin temp of ___

A
  • AUTO – When the switches are selected to AUTO the ECU’s digital channels control the operation of the pack “Flow Control & Shut Off Valve (FCSOV)” and the respective “Pack Bypass Valve” (in response to manual inputs) to automatically regulate cabin or flight compartment temperatures
  • Temperature control is based on feedback indication from “Zone Temperature Sensors”
    o CABIN & FLT COMP Temp Selector when set in AUTO:
  • Full Counter Clockwise – Full COLD: ECU will maintain a cabin temp of 15°C (59°F)
  • Full Clockwise – Full WARM: ECU will maintain a cabin temp of 27°C (81°F)
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7
Q

Pack Control Switches (toggle - three positions)
- MAN – When the switches are selected to MAN the ECU’s ___ channels control only the ___ (in response manual inputs) to regulate cabin or flight compartment temperatures. The ___ remains in a full ___ configuration when operating in the Manual mode
- Temperature control is based on ___. This means that in manual mode, the temp range is greater, therefore the chance of pack or duct overheat is increased
o CABIN & FLT COMP Temp Selector when set in MAN:
- Full Counter Clockwise – Full COLD: ECU will maintain a cabin duct temp of ___
- Full Clockwise – Full WARM: ECU will maintain a cabin duct temp of ___

A
  • MAN – When the switches are selected to MAN the ECU’s analog channels control only the “Pack Bypass Valves” (in response manual inputs) to regulate cabin or flight compartment temperatures. The “FCSOV” remains in a full open configuration when operating in the Manual mode
  • Temperature control is based on “Duct Supply Temperatures”. This means that in manual mode, the temp range is greater, therefore the chance of pack or duct overheat is increased
    o CABIN & FLT COMP Temp Selector when set in MAN:
  • Full Counter Clockwise – Full COLD: ECU will maintain a cabin duct temp of 3°C (37°F)
  • Full Clockwise – Full WARM: ECU will maintain a cabin duct temp of 71°C (160°F)
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8
Q

Pack Control Switches (toggle - three positions)
- OFF - When both Pack switches are selected OFF the ECU closes the ___ and the ____ resulting in a shut down of both ACMs

A
  • OFF - When both Pack switches are selected OFF the ECU closes the FCSOV and the Turbine Shut-off valves resulting in a shut down of both ACMs
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9
Q
  • With both ACMs operating (i.e. dual pack operation) the ECU uses approximately ___ of the air being supplied by the ___ pack for the flight compartment temperature. It uses the remaining volume of air from the ___ pack and all of the air being supplied by the ___ pack to control the cabin compartment temperature
A
  • With both ACMs operating (i.e. dual pack operation) the ECU uses approximately half of the air being supplied by the left pack for the flight compartment temperature. It uses the remaining volume of air from the left pack and all of the air being supplied by the right pack to control the cabin compartment temperature
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10
Q
  • During single pack operation: the Recirculation fan will run at ___ speed and the system will operate at ___ airflow (approximately __% of flow selection)
A
  • During single pack operation: the Recirculation fan will run at low speed and the system will operate at reduced airflow (approximately 70% of flow selection)
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11
Q

PRESSURIZATION
Controlled by:
- Cabin Pressurization Control System (CPCS) consist of the following: (4)

A

Controlled by:
- Cabin Pressurization Control System (CPCS) consist of the following:
o Cabin Pressure Controller (CPC)
o “Aft Outflow Valve” is the primary control valve to regulate cabin pressurization
o Aft Outflow valve is assisted by an “Aft Safety Outflow Valve” during ground operations
o “Forward Safety Outflow Valve” is available for emergency operations

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12
Q

PRESSURIZATION

- Pressurization system has four modes of operation:

A 
- Pressurization system has four modes of operation:
o	Automatic Mode
o	Manual Mode
o	Emergency/Smoke Removal Mode
o	Pressure Dump Mode
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13
Q

AFT Outflow Valve (Primary)

  • ___ controlled valve located on the ___ and regulated by the ___
  • It’s the ___ valve used for control of pressurization
  • Aft Outflow valve is used for both ___
A
  • Electrically controlled valve located on the aft pressure dome and regulated by the Cabin Pressure Controller (computer)
  • It’s the primary valve used for control of pressurization
  • Aft Outflow valve is used for both Automatic and Manual pressurization control
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14
Q

AFT Outflow Valve (Primary)
- Operated via the: “Pressurization Mode Select Switch” (overhead panel)
o AUTO - Cabin altitude is automatically controlled by the ___, valve which modulates to maintain a ___ cabin altitude schedule
o MAN - Selecting MAN turns ___ the Cabin Pressure Controller, outflow valve is now controlled by using the ___
o DUMP - Fully ___ the Aft Outflow valve to dump cabin pressure

A
  • Operated via the: “Pressurization Mode Select Switch” (overhead panel)
    o AUTO - Cabin altitude is automatically controlled by the Cabin Pressurization, valve which modulates to maintain a pre-programmed cabin altitude schedule
    o MAN - Selecting MAN turns OFF the Cabin Pressure Controller, outflow valve is now controlled by using the MAN DIFF (Manual Differential) switch
    o DUMP - Fully opens the Aft Outflow valve to dump cabin pressure
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15
Q

AFT Outflow Valve (Primary)
- If the CPC fails, the amber “FAULT” light (overhead) will illuminate
o Initially there will be NO “Master Warning” or “Master Caution”. However, as the cabin altitude rises due to the CPC failure, the ___ and a ___ light will illuminate indicating the cabin altitude has reached an excess of ___

A
  • If the CPC fails, the amber “FAULT” light (overhead) will illuminate
    o Initially there will be NO “Master Warning” or “Master Caution”. However, as the cabin altitude rises due to the CPC failure, the “CABIN PRESS” (CWP) and a “Master Warning” (Glareshield) light will illuminate indicating the cabin altitude has reached an excess of 9,800 Ft
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16
Q

AFT SAFETY Outflow Valve

  • Is an ___ valve and is also located on the ___
  • “Aft Safety Outflow Valve” supplies additional venting during ___
  • Valve opens on the ground when at least ___, or when the ___ is operating to supply additional bleed air venting
  • It also Incorporates ___ and ___ valves
A
  • Is an electro-pneumatic valve and is also located on the aft pressure dome
  • “Aft Safety Outflow Valve” supplies additional venting during ground operation
  • Valve opens on the ground when at least one engine is running at idle, or when the APU is operating to supply additional bleed air venting
  • It also Incorporates positive and negative pressure relief valves
17
Q

Forward Safety Valve
- Is a ___ valve located on the ___
- Valve is for ___ (e.g. smoke removal from the flight deck)
- Valve is operated 2 ways:
o “FWD Safety Outflow Valve: Manual Control Knob (overhead panel)
o “Forward Safety Outflow Valve” Selector is located on ___ and can also be used to manually open the Forward Safety Outflow valve
- When selected to OPEN (during emergency operations) the valve is ___
- It also Incorporates ___ and negative ___ valves

A
  • Is a pneumatic valve located on the forward pressure bulkhead
  • Valve is for emergency operations (e.g. smoke removal from the flight deck)
  • Valve is operated 2 ways:
    o “FWD Safety Outflow Valve: Manual Control Knob (overhead panel)
    o “Forward Safety Outflow Valve” Selector is located on front face of the copilot’s side console and can also be used to manually open the Forward Safety Outflow valve
  • When selected to OPEN (during emergency operations) the valve is fully opened
  • It also Incorporates positive and negative pressure relief valves
18
Q

Emergency Ram-Air Ventilation

  • During unpressurized flight (both packs off) cabin and flight deck are ventilated with ___
  • Air enters through the ___ and then exhausts through the ___
  • ___ Warning light will illuminate if cabin altitude exceeds ___
A
  • During unpressurized flight (both packs off) cabin and flight deck are ventilated with outside ram-air
  • Air enters through the dorsal fin NACA vents and then exhausts through the Forward Safety Outflow valve
  • “CABIN PRESS” Warning light will illuminate if cabin altitude exceeds 9,800 feet
19
Q

Takeoff Memorization Mode

  • Cabin Pressure Controller (CPC) remains in takeoff mode for ___ after liftoff
  • This avoids the requirement to reselect the landing altitude in case of an aborted flight and subsequent emergency return to the departure airport
A
  • Cabin Pressure Controller (CPC) remains in takeoff mode for 10 minutes after liftoff
  • This avoids the requirement to reselect the landing altitude in case of an aborted flight and subsequent emergency return to the departure airport

Dash 8 Q400 2 (16 decks)

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