ECS - Revision history

codex: /* Differential pressure rating */ Explain AFT-driven windshield damage and pressure-failure risk

2026-11-05T22:42:01Z

Differential pressure rating: Explain AFT-driven windshield damage and pressure-failure risk

← Older revision		Revision as of 22:42, 5 November 2026
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	Hull and windshield damage can cause pressure failure below the rated limit. An intact vehicle’s failure margin does not increase its operating rating. An unpressurized vehicle has no applicable cabin differential-pressure rating; an unverified rating is marked '''Not specified'''.		Hull and windshield damage can cause pressure failure below the rated limit. An intact vehicle’s failure margin does not increase its operating rating. An unpressurized vehicle has no applicable cabin differential-pressure rating; an unverified rating is marked '''Not specified'''.

			During [[Atmospheric Reentry\|atmospheric re-entry]] or other severe airframe heating, '''AFT above 350°C progressively damages the windshield assembly'''. Damage accelerates sharply as AFT rises, and continues even after wing loss. Cracks become visible as windshield condition deteriorates. Cooling below the damage threshold stops further heat damage but does not repair existing damage.

			At a sufficiently large cabin-to-outside pressure difference, the weakened hull or windshield causes fatal explosive decompression; windshield condition does not have to reach zero first. AFT is the airframe-temperature indication, not cabin-air or glass temperature. This thermal windshield damage is disabled in the in-world simulator.

	== Surface living and transfers ==		== Surface living and transfers ==

codex: Keep model-specific pressure data in vehicle specifications; explain common ECS terms

2026-11-01T13:33:53Z

Keep model-specific pressure data in vehicle specifications; explain common ECS terms

← Older revision		Revision as of 13:33, 1 November 2026
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	== Vehicle pressure arrangements ==		== Vehicle pressure arrangements ==
	{\| ~~class="wikitable"~~		Each [[:Category:Vehicles\|vehicle article]] lists its own '''Cabin pressurization''' and '''Rated pressure differential''' in the specifications.
	~~! Vehicle !! Pressure arrangement !! Operating distinction~~
	\|-		* '''Unpressurized''' cabins follow surrounding pressure. Conditioned breathing air does not make a cabin a pressure vessel.
	~~\| C-2, C-2A and C-98 \|\|~~ Unpressurized~~; cabin follows~~ surrounding pressure ~~\|\| Surface cars~~. Conditioned breathing air does not make ~~the~~ cabin a pressure vessel.		* '''Pressurized — atmospheric gas intake''' means the cabin can maintain a pressure difference, but requires sufficient outside atmosphere to replenish gas. Pressurization alone does not provide space capability.
	\|-		* '''Pressurized — stored breathing gas''' means the craft can replenish cabin gas independently of thin outside atmosphere or vacuum.
	~~\| T-120, T-121 and T-27 \|\| Unpressurized;~~ cabin ~~follows surrounding~~ pressure ~~\|\| Surface trucks and ground transport.~~		* An '''EVA suit''' is a personal pressure enclosure supplying the wearer’s pressure and breathing environment.
	\|-
	~~\| A-4 and T-19 \|\| Pressurized crew cabin \|\| Atmospheric aircraft. Cabin pressurization does not make them spacecraft; their life support~~ requires sufficient outside atmosphere to replenish gas.
	\|-
	~~\| E-10, E-11, P-13 and W-6 \|\|~~ Pressurized ~~crew cabin with~~ stored breathing ~~gases \|\| Space-capable~~ craft~~. Cabin pressure~~ can ~~be maintained~~ independently of ~~the~~ thin ~~upper~~ atmosphere or vacuum.
	\|-
	\| EVA suit ~~\|\| Personal~~ pressure enclosure ~~\|\| A suit supplies~~ the ~~wearer's~~ pressure and breathing environment~~; it is not an unpressurized surface vehicle~~.
	\|}

	Passenger ARJ modules provide enclosed, pressurized passenger accommodation. Ordinary cargo space is not a substitute for passenger life support. A car carried inside another vehicle follows the surrounding bay environment: the closed bay uses the carrier's cabin pressure, while an open bay exposes it to the outside pressure.		Passenger ARJ modules provide enclosed, pressurized passenger accommodation. Ordinary cargo space is not a substitute for passenger life support. A car carried inside another vehicle follows the surrounding bay environment: the closed bay uses the carrier's cabin pressure, while an open bay exposes it to the outside pressure.

			== Differential pressure rating ==
			The rating in a vehicle’s specifications is the limit for '''cabin pressure above the surrounding pressure'''. For example, 2,400 mbar differential is 240 kPa above the surroundings; it is not a 2,400 mbar absolute cabin-pressure target and is not a rating for pressure in the opposite direction. On craft with the relevant indication, exceeding this rating triggers '''DIFF PRESS'''.

			Hull and windshield damage can cause pressure failure below the rated limit. An intact vehicle’s failure margin does not increase its operating rating. An unpressurized vehicle has no applicable cabin differential-pressure rating; an unverified rating is marked '''Not specified'''.

	== Surface living and transfers ==		== Surface living and transfers ==

codex: Document vehicle pressure arrangements, ambient-pressure living and implemented automatic cabin control

2026-11-01T13:17:04Z

Document vehicle pressure arrangements, ambient-pressure living and implemented automatic cabin control

← Older revision		Revision as of 13:17, 1 November 2026
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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.		The '''Environmental Control System (ECS)''', or life support, provides conditioned cabin air. Breathable gas composition, temperature control and cabin pressurization are separate functions. An '''unpressurized''' vehicle can still provide breathable air: its total cabin pressure follows its surroundings instead of maintaining a separate pressure.

	*Automatic Pressurization Modes		== Vehicle pressure arrangements ==
	**Ground mode: Both the outflow valve and ground valve are driven full open.		{\| class="wikitable"
	**Pre-~~Pressure mode: When thrust levers are advanced to take~~-~~off~~, ~~the~~ cabin		! Vehicle !! Pressure arrangement !! Operating distinction
	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~~		\| C-2, C-2A and C-98 \|\| Unpressurized; cabin follows surrounding pressure \|\| Surface cars. Conditioned breathing air does not make the cabin a pressure vessel.
	~~take~~-~~off without air-conditioning,~~ the ~~outflow valve~~ and ~~ground valve are driven~~		\|-
	~~closed~~.		\| T-120, T-121 and T-27 \|\| Unpressurized; cabin follows surrounding pressure \|\| Surface trucks and ground transport.
	**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~~		\| A-4 and T-19 \|\| Pressurized crew cabin \|\| Atmospheric aircraft. Cabin pressurization does not make them spacecraft; their life support requires sufficient outside atmosphere to replenish gas.
	~~open~~.		\|-
	**Initial Climb mode: Cabin climb is in accordance with a fixed schedule, cabin altitude vs		\| E-10, E-11, P-13 and W-6 \|\| Pressurized crew cabin with stored breathing gases \|\| Space-capable craft. Cabin pressure can be maintained independently of the thin upper atmosphere or vacuum.
	~~airplane altitude. The climb rate varies between approximately 500~~ and ~~800 ft/min,~~		\|-
	~~dependent~~ on ~~the airplane climb speed~~. ~~The controller compares selected landing~~		\| EVA suit \|\| Personal pressure enclosure \|\| A suit supplies the wearer's pressure and breathing environment; it is not an unpressurized surface vehicle.
	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~~		Passenger ARJ modules provide enclosed, pressurized passenger accommodation. Ordinary cargo space is not a substitute for passenger life support. A car carried inside another vehicle follows the surrounding bay environment: the closed bay uses the carrier's cabin pressure, while an open bay exposes it to the outside pressure.
	~~1,000 ft/min, the system will then assume~~ the elevation ~~for~~ the ~~departing airport,~~
	~~regardless of~~ the ~~pre-selected landing elevation~~		== Surface living and transfers ==
	**Enroute Climb mode: Cabin climb is in accordance with a fixed schedule, cabin altitude vs		[[Vieneo#Living on Vieneo\|Living on Vieneo]] uses conditioned breathing gas near local ambient pressure. At [[Deois]] street elevation, approximately 300 m above mean sea level, the reference pressure is about '''2527 mbar (2.49 Earth atmospheres absolute)'''. Apartments, garages and surface cars therefore do not normally require a large pressure change simply to move between them and the street. Pressure still varies with elevation; an upper-floor apartment need not have exactly the same pressure as the ground floor.
	~~airplane altitude~~. ~~The climb rate varies between approximately 500~~ and ~~800 ft/min,~~
	~~dependent on the airplane climb speed~~. ~~The controller compares selected landing~~		Pressure compatibility does not make untreated outside air breathable. Vieneo's atmosphere has too little oxygen and contains sulfur dioxide. Habitable air must have the contaminants removed and oxygen controlled by its '''partial pressure''', rather than copying Earth's oxygen percentage at a much higher total pressure.
	~~elevation to~~ the ~~climb schedule~~, ~~then selects the highest~~ pressure ~~schedule~~.
	**Cruise mode: When cabin ~~altitude is +/- 200 ft for 10 minutes~~		== Automatic cabin control ==
	**Descent mode: The cabin ~~full descent schedule occurs when~~ the ~~airplane~~ is in		Pressurized craft automatically adjust their cabin pressure. On the ground, the target is the surrounding pressure. When actually docked at an orbital facility, the surrounding dock environment is one Earth atmosphere, '''1013.25 mbar'''. Merely flying near a station does not mean the vehicle is docked.
	~~descent~~. ~~Cabin altitude decreases~~ at ~~approximately 300 to 750 ft/min~~, ~~to either~~
	~~landing elevation~~, ~~or maximum differential, whichever~~ is ~~highest~~. ~~When the landing~~		In flight, an orbital target selects a one-Earth-atmosphere cabin target. A selected surface waypoint uses its elevation to determine the destination pressure. Without such a waypoint, the controller uses its local approach/above-clouds logic. The pressure target is not a guarantee that the cabin has already reached that pressure.
	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		Powered cabin regulation changes pressure gradually, at up to approximately '''0.322 mbar per second'''. A small difference may equalize directly on the ground or when docked. Space-capable craft can replenish cabin gas from stored supplies; atmospheric-only craft cannot keep increasing cabin pressure when the outside pressure falls below approximately '''25 mbar'''. This distinction matters during high-altitude ascent and suborbital coast as well as in orbit. During descent and re-entry, allow time for cabin pressure to approach the destination environment before transfer.
	~~pre-selected landing elevation.~~
	**Landing mode: The ~~cabin altitude~~ is ~~driven below field elevation or the airplane~~ is		The pressurization controller is automatic and is separate from Autoflyte. Low airspeed in hover does not by itself remove cabin protection. Watch the cabin and differential-pressure indications where fitted; a normal outside pressure does not prove that the cabin is ready for transfer.
	~~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~~.		== Indications and warnings ==
	**Touch and Go mode: On ~~airplane touchdown,~~ the ~~system will assume landing~~		Pressures are absolute '''mbar''' unless identified as differential pressure. Differential pressure is cabin pressure minus surrounding pressure. It is distinct from the pressure change experienced by a person's ears.
	~~mode; as the thrust levers~~ are ~~advanced~~, ~~the system will schedule pre~~-~~pressure~~
	~~mode~~.		On vehicles equipped with the relevant CAS indications:
	*~~Automatic Pressurization Schedules~~		* '''CABIN ALT''' is a caution below 737 mbar and a warning below about 703.3 mbar. These are cabin-pressure thresholds, not Vieneo terrain-altitude limits.
	**By 60 km the cabin pressure ~~target~~ is ~~1 EATM~~ to ~~reduce~~ the pressure ~~differential~~ and ~~for docking compatibility~~.		* '''DIFF PRESS''' warns when the cabin-to-surroundings difference exceeds the vehicle's limit. A difference greater than 100 mbar also produces a caution when a pressurized craft is on the ground or a vehicle is docked.
	**By field elevation the ~~cabin~~ pressure ~~target is OAP-150 ft~~.		* Hull and windshield condition affect resistance to a pressure failure. Pressurization is not permission to exceed the vehicle's operating limits.
	*~~Pressurization Caution and Warning~~
	**8000?		Gradual pressure changes can cause ear popping and temporarily muffled hearing. A rapid, substantial equalization can cause ringing. These effects represent changing pressure, not the steady high pressure of an ordinary Deois residence.
	**14000?
			== See also ==
			* [[Vieneo#Living on Vieneo\|Living on Vieneo]]
			* [[:Category:Deois#Living in Deois\|Living in Deois]]
			* [[Bradbury Apartments]]

	[[Category:Avionics]]		[[Category:Avionics]]

reskin at 21:44, 5 April 2021

2021-04-05T21:44:07Z

← Older revision		Revision as of 21:44, 5 April 2021
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	*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
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	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.
			**Cruise mode: When cabin altitude is +/- 200 ft for 10 minutes
	**Descent mode: The cabin full descent schedule occurs when the airplane is in		**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		descent. Cabin altitude decreases at approximately 300 to 750 ft/min, to either

reskin at 16:49, 5 April 2021

2021-04-05T16:49:20Z

reskin: Created page with "Environmental Control System (ECS) is also known as Life Support is responsible for the pressurization, heating/cooling, and composition of the cabin air. * Automatic Pressur..."

2021-04-05T16:48:13Z

Created page with "Environmental Control System (ECS) is also known as Life Support is responsible for the pressurization, heating/cooling, and composition of the cabin air. * Automatic Pressur..."

New page

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?

[[Category:Avionics]]

← Older revision		Revision as of 16:49, 5 April 2021
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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,
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	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.