FA50 Cabin pressure not modeled

[archaic58 5]

Hello all,

I don't know how in depth they plan to take the FA50 but I opened the pilot window by accident at FL410 and did not lose cabin pressure. Just a note to the Flysimware team. I love this aircraft and thanks for bringing it to the simulator world. 

[Flysimware 647]

The code for the pressurization system is already included in flight sim with default variables. Looks like they did not include open doors as part of the system. And we have no plans to take this complex code we had to write up using their variables and include failures like that.

Edited December 14, 2018 by Flysimware

[JRBarrett 3,099]

42 minutes ago, Flysimware said:

The code for the pressurization system is already included in flight sim with default variables. Looks like they did not include open doors as part of the system. See if the main exit causes a change i Doubt it since the pilot window is not a default exit. And we have no plans to take this complex code we had to write up using their variables and include failures like that.

Even though failures (like an open window) are not modeled, I do find that the simulation of how the pressurization operates is very accurate. Cabin rate-of-climb and descent, cabin altitude and differential pressure vs. aircraft altitude are all right on the money.

[ark 1,293]

46 minutes ago, JRBarrett said:

Even though failures (like an open window) are not modeled, I do find that the simulation of how the pressurization operates is very accurate. Cabin rate-of-climb and descent, cabin altitude and differential pressure vs. aircraft altitude are all right on the money.

Jim -- just curious. Is there any kind of safety interlock system on the Falcon 50 that prevents a window from being opened by accident in flight (based on a squat switch, perhaps), or maybe above a certain altitude like 10,000ft?

Thx,

Al

Edited December 14, 2018 by ark

[Bob Scott 7,725]

18 minutes ago, ark said:

Jim -- just curious. Is there any kind of safety interlock system on the Falcon 50 that prevents a window from being opened by accident in flight (based on a squat switch, perhaps), or maybe above a certain altitude like 10,000ft?

Generally speaking, aircraft windows are the "plug" variety, meaning they are held against the outer seals by the pressure differential between the acft's pressure vessel and ambient outside air pressure.  A 2x2 ft window at 7 PSID has over 4000 lbs of force holding it against the seal.  No safety interlock needed unless the Incredible Hulk is flying the jet and wants some fresh air.

Regards

[Bob Scott 7,725]

1 hour ago, Flysimware said:

The code for the pressurization system is already included in flight sim with default variables. Looks like they did not include open doors as part of the system. See if the main exit causes a change i Doubt it since the pilot window is not a default exit. And we have no plans to take this complex code we had to write up using their variables and include failures like that.

It's not really all that hard or complex, honestly...if a door or window is open, then cabin differential pressure = 0, cabin pressure  = ambient pressure, and cabin altitude = the acft's pressure altitude. 

Regards

[Flysimware 647]

Well then Ark may be right a simple fix would be to simply make the window and main exit stay shut once above 10K. Easier than trying to model loss of pressure when that is not even possible.

[JRBarrett 3,099]

31 minutes ago, ark said:

Jim -- just curious. Is there any kind of safety interlock system on the Falcon 50 that prevents a window from being opened by accident in flight (based on a squat switch, perhaps), or maybe above a certain altitude like 10,000ft?

Thx,

Al

The only window that can be opened is the pilot’s side window, and there is no way that it could be opened once the aircraft is even slightly pressurized. When the latch handle is lifted, the window pulls inwards slightly. At typical cabin differential pressures of 7-8 psi, there are several hundred pounds of force pressing against the window - it will not move.

Likewise for the emergency exit, which is a plug door, that only opens inwards. When pressurized, it cannot move at all.

[por930 51]

Maybe a solution, (though not very important in the scheme of things) to get the window/door pressurisation system working:

If, when on the ground, a window or door is open, the T/O Config lights up. When all doors/windows shut, good to go.

When above say 10,000 feet, the windows/door controllers become inoperative, stopping any inadvertent actions.

Edited December 22, 2018 by por930

[Flysimware 647]

2 hours ago, por930 said:

Maybe a solution, (though not very important in the scheme of things) to get the window/door pressurisation system working:

If, when on the ground, a window or door is open, the T/O Config lights up. When all doors/windows shut, good to go.

When above say 10,000 feet, the windows/door controllers become inoperative, stopping any inadvertent actions.

Our next update will include these conditions: Above 7K AGL the window handle will not move. Window open and below 7K AGL the red cabin light on the warning panel will illuminate.

We already have these conditions for the cabin light. The door latch for the main exit unlocked or the main exit open. Above 10,000 feet cabin pressure or the cabin test mode.

Edited December 22, 2018 by Flysimware

[por930 51]

3 hours ago, Flysimware said:

Our next update will include these conditions: Above 7K AGL the window handle will not move. Window open and below 7K AGL the red cabin light on the warning panel will illuminate.

We already have these conditions for the cabin light. The door latch for the main exit unlocked or the main exit open. Above 10,000 feet cabin pressure or the cabin test mode.

Excellent. Sometimes the basic solutions work quite well, until more system interaction is required 

[JRBarrett 3,099]

5 hours ago, Flysimware said:

Our next update will include these conditions: Above 7K AGL the window handle will not move. Window open and below 7K AGL the red cabin light on the warning panel will illuminate.

We already have these conditions for the cabin light. The door latch for the main exit unlocked or the main exit open. Above 10,000 feet cabin pressure or the cabin test mode.

In the actual aircraft, there is no sensor on the pilot’s sliding window. I know you already have the red warning light if the main door is unlocked. There is also a sensor on the emergency exit that will light the same lamp if it is not latched. 

Even as little as 1 psi differential pressure will prevent the sliding window from opening. 

[Flysimware 647]

10 hours ago, JRBarrett said:

In the actual aircraft, there is no sensor on the pilot’s sliding window. I know you already have the red warning light if the main door is unlocked. There is also a sensor on the emergency exit that will light the same lamp if it is not latched. 

Even as little as 1 psi differential pressure will prevent the sliding window from opening. 

I will update this tonight.