ECS: Difference between revisions
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Environmental Control System (ECS) is also known as Life Support is responsible for the pressurization, heating/cooling, and composition of the cabin air. | Environmental Control System (ECS) is also known as Life Support is responsible for the pressurization, heating/cooling, and composition of the cabin air. | ||
* Automatic Pressurization Modes | *Automatic Pressurization Modes | ||
** Ground mode: Both the outflow valve and ground valve are driven full open. | **Ground mode: Both the outflow valve and ground valve are driven full open. | ||
** Pre-Pressure mode: When thrust levers are advanced to take-off, the cabin | **Pre-Pressure mode: When thrust levers are advanced to take-off, the cabin | ||
pressure moves towards the scheduled cabin pressure with a pressure rate of | pressure moves towards the scheduled cabin pressure with a pressure rate of | ||
change equal to 300 ft/min, limited at a differential pressure of 150 ft/min. During | change equal to 300 ft/min, limited at a differential pressure of 150 ft/min. During | ||
take-off without air-conditioning, the outflow valve and ground valve are driven | take-off without air-conditioning, the outflow valve and ground valve are driven | ||
closed. | closed. | ||
** Take-Off abort mode: When the thrust levers are retarded to idle, the cabin ascends | **Take-Off abort mode: When the thrust levers are retarded to idle, the cabin ascends | ||
at approximately 500 ft/min for 20 seconds, then the outflow valves are driven full | at approximately 500 ft/min for 20 seconds, then the outflow valves are driven full | ||
open. | open. | ||
** Initial Climb mode: Cabin climb is in accordance with a fixed schedule, cabin altitude vs | **Initial Climb mode: Cabin climb is in accordance with a fixed schedule, cabin altitude vs | ||
airplane altitude. The climb rate varies between approximately 500 and 800 ft/min, | airplane altitude. The climb rate varies between approximately 500 and 800 ft/min, | ||
dependent on the airplane climb speed. The controller compares selected landing | dependent on the airplane climb speed. The controller compares selected landing | ||
elevation to the climb schedule, then selects the highest pressure schedule. | elevation to the climb schedule, then selects the highest pressure schedule. | ||
** Flight abort mode: When the airplane has maintained an altitude of up to 6,000 feet | **Flight abort mode: When the airplane has maintained an altitude of up to 6,000 feet | ||
above the take-off field altitude for 10 minutes, and then has initiated a descent of | above the take-off field altitude for 10 minutes, and then has initiated a descent of | ||
1,000 ft/min, the system will then assume the elevation for the departing airport, | 1,000 ft/min, the system will then assume the elevation for the departing airport, | ||
Line 30: | Line 30: | ||
differential, until the airplane descends, then the cabin altitude will rate up to the | differential, until the airplane descends, then the cabin altitude will rate up to the | ||
pre-selected landing elevation. | pre-selected landing elevation. | ||
** Landing mode: The cabin altitude is driven below field elevation or the airplane is | **Landing mode: The cabin altitude is driven below field elevation or the airplane is | ||
unpressurized. When the cabin is below field elevation, then the cabin is rated up at | unpressurized. When the cabin is below field elevation, then the cabin is rated up at | ||
approximately 600 ft/min for 30 seconds, then the outflow valve is driven full open. | approximately 600 ft/min for 30 seconds, then the outflow valve is driven full open. | ||
** Touch and Go mode: On airplane touchdown, the system will assume landing | **Touch and Go mode: On airplane touchdown, the system will assume landing | ||
mode; as the thrust levers are advanced, the system will schedule pre-pressure | mode; as the thrust levers are advanced, the system will schedule pre-pressure | ||
mode. | mode. |
Revision as of 16:49, 5 April 2021
Environmental Control System (ECS) is also known as Life Support is responsible for the pressurization, heating/cooling, and composition of the cabin air.
- Automatic Pressurization Modes
- Ground mode: Both the outflow valve and ground valve are driven full open.
- Pre-Pressure mode: When thrust levers are advanced to take-off, the cabin
pressure moves towards the scheduled cabin pressure with a pressure rate of change equal to 300 ft/min, limited at a differential pressure of 150 ft/min. During take-off without air-conditioning, the outflow valve and ground valve are driven closed.
- Take-Off abort mode: When the thrust levers are retarded to idle, the cabin ascends
at approximately 500 ft/min for 20 seconds, then the outflow valves are driven full open.
- Initial Climb mode: Cabin climb is in accordance with a fixed schedule, cabin altitude vs
airplane altitude. The climb rate varies between approximately 500 and 800 ft/min, dependent on the airplane climb speed. The controller compares selected landing elevation to the climb schedule, then selects the highest pressure schedule.
- Flight abort mode: When the airplane has maintained an altitude of up to 6,000 feet
above the take-off field altitude for 10 minutes, and then has initiated a descent of 1,000 ft/min, the system will then assume the elevation for the departing airport, regardless of the pre-selected landing elevation
- Enroute Climb mode: Cabin climb is in accordance with a fixed schedule, cabin altitude vs
airplane altitude. The climb rate varies between approximately 500 and 800 ft/min, dependent on the airplane climb speed. The controller compares selected landing elevation to the climb schedule, then selects the highest pressure schedule.
- Descent mode: The cabin full descent schedule occurs when the airplane is in
descent. Cabin altitude decreases at approximately 300 to 750 ft/min, to either landing elevation, or maximum differential, whichever is highest. When the landing elevation exceeds 8,000 feet, cabin altitude will be maintained at maximum differential, until the airplane descends, then the cabin altitude will rate up to the pre-selected landing elevation.
- Landing mode: The cabin altitude is driven below field elevation or the airplane is
unpressurized. When the cabin is below field elevation, then the cabin is rated up at approximately 600 ft/min for 30 seconds, then the outflow valve is driven full open.
- Touch and Go mode: On airplane touchdown, the system will assume landing
mode; as the thrust levers are advanced, the system will schedule pre-pressure mode.
- Automatic Pressurization Schedules
- By 60 km the cabin pressure target is 1 EATM to reduce the pressure differential and for docking compatibility.
- By field elevation the cabin pressure target is OAP-150 ft.
- Pressurization Caution and Warning
- 8000?
- 14000?