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78 Cards in this Set
- Front
- Back
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Where may bleed air for pack operation be supplied from? |
1. Either engine
2. APU while on the ground |
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What components make up the "Air Conditioning" system?
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1. Bleed air system for each engine.
2. One (1) integrated air conditioning pack. 3. APU 4. Air distribution and re-circulation duct systems. 5. ECS Electronic Control System. |
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Where is the air conditioning pack located on the aircraft?
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In the tail section.
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The air conditioning pack contains what?
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Two (2) Air Cycle Machines
One (1) dual heat exchanger |
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What three modes of operation does the pressurization system provide?
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Automatic Mode
Manual Mode Dump Mode |
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When does the "Recirc Fan" automatically operate?
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1. Fan is selected to "RECIRC" position.
2. During "Engine Start". 3. During single ACM operations. |
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Where does the Recirc Fan draw its air from?
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The Aft Cargo Compartment.
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Where is the Recirc Fan physically located on the aircraft?
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In the Air Cycle Machine (ACM) service bay.
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When does the Recirc Fan operate at "slow speed" automatically?
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1. When initially selected to "RECIRC" (ON) position.
Note: The ECU will select "High Speed" as required. 2. During engine start 3. During single ACM operations. |
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What is the purpose of the "Duct Temperature Selector"?
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The knob selects which duct temperature is displayed on the "Duct Temperature Gauge".
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Is the Duct Temperature displayed as degrees Fahrenheit or Celsius?
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Celsius
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When the Duct Temperature Selector knob is selected to the "Cabin Duct" position, what is displayed?
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Displays the "cabin air supply duct" temperature.
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When the Duct Temperature Selector is selected to the "Cabin" position, what is displayed?
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Displays the cabin zone temperature measured from "Mid Cabin" at row 7 (Left Side).
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When the Duct Temperature Selector is selected to the "FC DUCT" position, what is displayed?
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Displays the flight compartment "supply duct" temperature.
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What are the three positions for the pack control switches?
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AUTO
MAN OFF |
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When the "Pack Control" switches are placed to the "AUTO" position, how is the cabin temperature controlled?
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The ECU controls the operation of the pack "Flow Control Shutoff Valve" (FCSOV) as well as the respective "Pack Bypass Valve" to automatically regulate temperature.
Only "Digital" channels are used! |
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When the "Pack Control" switches are placed to the "MAN" position, how is the cabin temperature controlled?
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The ECU will regulate only the Pack "Bypass Valves" to regulate compartment temperature.
Only "Analog" channels are used! |
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When operating the Pack Control Switches in the "Manual Mode", what position does the FCSOV (Flow Control Shutoff Valve) remain?
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In the "Full Open" position.
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When the "Pack Control" switches are placed to the "OFF" position, what occurs?
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The ECU will close the FCSOV (Flow Control Shutoff Valve) and the "Turbine Shutoff Valves", resulting in both ACM's shutting down.
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What does the acronym FCSOV stand for?
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Flow Control Shutoff Valve
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During "Dual ACM Operation" where does each Air Cycle Machine supply its air to?
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Left Pack:
50% of air to flight deck / 50% to cabin Right Pack: 100% of air goes to cabin. |
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How does "Single ACM Operation" differ from that of both ACMs operating?
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1. Only one (1) ACM will be operational.
2. The Recirc Fan will operate at slow speed. 3. The system will operate at a reduced airflow of approximately 70% of flow selection. |
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Turning the Cabin and Flight Compartment Temperature Selector (Rotary Knob) all the way to the far left position of "FA" does what?
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It will enable the Flight Attendant Panels temperature control feature.
The "FA Control Enabled" advisory light on the flight attendant panel will illuminate. The flight attendants will be able to control the cabin temperature through only a limited range! |
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At what time is the cabin temperature control active on the flight attendant panel?
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Only when the cockpit temperature selector is selected to the "FA" position.
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Does the flight attendant panel provide control ability to direct air distribution between the upper and lower vents?
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No
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What controls air distribution between the upper and lower ducts in the cabin?
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The Environmental Control Unit (ECU) automatically directs air flow between the upper and lower ducts depending on temperature demands.
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How many outflow valves are provided in the pressurization system?
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Three (3)
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What are the names of the different outflow valves?
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1. Aft Outflow Valve
2. Aft Safety Outflow Valve 3. Fwd Safety Outflow Valve |
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Which outflow valve is the "Primary" outflow valve?
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Aft Outflow Valve
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What is the purpose of the Aft Safety Outflow Valve?
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It will assist the primary outflow valve during ground operations.
Note: Provides additional ventilation for ground operations! |
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Where is the Aft Outflow valve physically located on the aircraft?
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On the aft pressure bulkhead behind the aft cargo compartment.
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What regulates the operation of the aft outflow valve?
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The Cabin Pressure Controller in response to pilot inputs.
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What is the purpose of the "Forward Safety Outflow Valve"?
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It is used for emergency operations.
1. Evacuates smoke from the flight deck. 2. Used to exhaust "ram air" pressure when both packs fail! (The checklist directs you to "open" the Forward Safety Outflow Valve) |
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Where does the Forward Safety Outflow Valve dump the cabin pressure?
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Into the nose cone of the aircraft.
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During "Automatic Mode" of the pressurization system, which outflow valve is used?
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The Aft Outflow Valve.
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During "Manual Mode" of the pressurization system, which outflow valve is used?
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The Aft Outflow Valve
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Is it possible to "dump" the cabin pressurization using the Aft Outflow Valve?
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Yes
Used for emergency smoke evacuation. |
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The Aft Safety Outflow Valve is a ____________ valve.
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Electro-pneumatic
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Where is the "Aft Safety Outflow Valve" physically located on the aircraft?
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It is on the aft pressure bulkhead with the normal "Aft Outflow Valve".
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What does the "Aft Safety Outflow Valve" provide for?
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Additional venting during ground operations.
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When does the "Aft Safety Outflow Valve" open?
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1. Aircraft is on the ground "AND" one (1) engine is running at "IDLE".
"OR" 2. Aircraft is on the ground "AND" the APU is operating. Note: Bleed air is required to hold the aft safety outflow valve open! |
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The "FWD Safety Outflow Valve" is a __________ valve.
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pneumatic
Note: It requires "slipstream air" to operate! |
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What is the "primary" purpose of the "Fwd Safety Outflow Valve"?
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It is used in the event of an emergency to evacuate smoke from the cockpit.
It also provides for ventilation of Ram Air when being used. |
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The "FWD and AFT Safety Outflow Valves" both incorporate:
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Positive pressure relief valves
Negative pressure relief valves |
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What are the four (4) modes of operation for the cabin pressurization system?
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1. Automatic Mode
2. Manual Mode 3. Pressure Dump Mode 4. Emergency Smoke Removal Mode |
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The Pressurization Mode Select switch is a _____ position switch.
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Three (3)
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What are the three positions on the pressurization mode select switch?
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AUTO
MAN DUMP |
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What controls the aircraft's pressurization when in the "AUTO" mode of operation?
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The Cabin Pressure Controller (CPC) automatically controls the operation of the Aft Outflow Valve.
Maintains a "Pre-Programmed" cabin altitude schedule. |
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What controls the aircraft's pressurization when in the "MAN" mode of operation?
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The "cabin pressure controller" is turned off and the Aft Outflow Valve is modulated via the spring loaded "Man Diff" switch.
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Selecting the spring loaded "Man Diff" switch to the far left (INCR) position will do what?
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It will close the aft outflow valve and "Increase" the cabin differential.
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Selecting the spring loaded "Man Diff" switch to the far right (DECR) position will do what?
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It will open the aft outflow valve and "decrease" the cabin differential.
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The "Man Diff" switch will directly control what?
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The Aft outflow valves position.
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What does selecting the Pressurization Mode Select Switch to the "DUMP" position do?
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It will "fully" open the Aft Outflow Valve to dump cabin pressure.
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What is the purpose of the "Landing Altitude" set knob?
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It sets the landing altitude of the destination field as displayed on the pressurization panel.
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What is the purpose of the "FWD Safety Outflow Valves" manual control knob on the overhead panel?
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It will open and close the FWD Safety Outflow Valve during an emergency smoke evacuation procedure.
The valve can be regulated whereas the forward outflow valve selector on the first officer's side panel is either "fully open or fully closed". |
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During "normal operations" the FWD Safety Outflow Valve is in the full ________ position.
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counter-clockwise (Closed)
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Is the FWD Safety Outflow Valve's operation dependent on the Aft Outflow Valve's operation?
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No ... it is fully independent of the Aft Outflow Valves operation.
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What does the Pressurization systems amber "Fault" light indicate when illuminated?
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It indicates a fault in the automatic pressurization system.
It will also illuminate briefly during initial power-up during the system self-test. |
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At what times will the amber "fault" light illuminate on the cabin pressurization panel?
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1. When a fault is detected in the system.
2. Briefly during initial power-up. 3. During self test mode. |
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Where is the FWD Outflow Valve "selector" located on the aircraft?
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First officers side panel (front face).
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How is the FWD Safety Outflow Valve controlled?
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By use of the FWD Outflow Valve Selector located on the first officers side console (full open or full closed).
Also by use of the FWD Safety outflow valve control on the overhead panel (for fine adjustments). |
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At what times is the FWD Outflow Valve "automatically" opened?
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Never ... it can only be manually opened in the event of an emergency.
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Is it possible to close the guard cover over the FWD Safety Outflow Valve when the valve is selected to a position other than "NORM"?
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No
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When the FWD Outflow Valve is selected to the "OPEN" position on the FOs side panel, can the valves position be regulated?
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No ... the valve is either "fully open" or "fully closed".
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While operating the pressurization system in the "Automatic" mode what controls the cabin pressurization?
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The cabin pressure controller will automatically control the cabin pressurization using a "Pre-programmed" schedule.
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When operating in the automatic mode the cabin pressure controller will regulate the ______ outflow valve to control cabin pressure.
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AFT Outflow Valve
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In automatic mode the "Cabin Pressure Controller" will maintain a fixed schedule of _____________.
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cabin altitude versus aircraft altitude
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At what time is the Aft Outflow Valve fully "OPEN"?
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1. When the aircraft is on the ground with "both" the engine power levers angles set below 60 degrees.
2. When selected to the "dump mode". |
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At what time does the cabin pressure controller send the signal to operate the Aft Outflow Valve during the takeoff roll?
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When "either" engine thrust lever is advanced above the 60 degree angle position.
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What does the "Takeoff Abort" mode do with regards to the pressurization system?
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Departure field elevation is remembered for "up to 10 minutes" following lift off in the event that a return to field is accomplished.
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At what time is "Manual Mode" selected on the pressurization system?
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Only when the cabin pressurization controller "fails" as indicated by the amber "fault" light illuminated on the pressure control panel.
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When the pressurization system is selected to the "MAN" position, what controls the Aft Outflow valves position?
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The aft outflow valves position is regulated by the use of the spring loaded "MAN DIFF" - Increase / Decrease switch via inputs from the pilots.
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What is the purpose of the "DUMP" position on the cabin pressure controller?
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It provides a means to rapidly dump the cabin pressure in the event that smoke is in the cabin.
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Selecting the "Dump" position on the pressure control panel will cause the Aft Outflow Valve to _______ open.
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Fully
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What is the purpose of "Emergency Ram-Air Ventilation"?
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To ventilate the cabin and flight deck during "unpressurized" flight.
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At what time is emergency Ram-air available to the cabin and flight deck?
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Ram air is available when "both packs" are selected to the "OFF" position.
Air entering through the dorsal fin is automatically routed to the cabin air supply ducts. |
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When ram-air is supplying outside air to the cabin and flight deck, where is the air exhausted through?
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The FWD Safety Outflow Valve into the nose compartment.
Opening the forward safety outflow valve is directed by the checklist. |
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At what altitude will the "Cabin Pressure" warning light illuminate?
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Above 9,800 feet cabin altitude.
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