How to pressurize [Resolved]

[curtoavida]

Hello.... i tryied too much ways to fix this problem but i cant, i trying to pressurize airplane but i never can do it good...

I will fly in FL-350 so i set pressurization to FL360 all right??.. i open bleed air valves army oxygen i put condition levers to high iddle.... but after 10.000feet i have mastercaution and this message in red colour shows up... and my cabin climb rate have to be about 500 but goes to 2.000 and come down and go up again until i be at FL350 i dont know what is wrong please help...

[Raptor]

Your blowers are off

[Taguilo]

Hello.... i tryied too much ways to fix this problem but i cant, i trying to pressurize airplane but i never can do it good...

I will fly in FL-350 so i set pressurization to FL360 all right??.. i open bleed air valves army oxygen i put condition levers to high iddle.... but after 10.000feet i have mastercaution and this message in red colour shows up... and my cabin climb rate have to be about 500 but goes to 2.000 and come down and go up again until i be at FL350 i dont know what is wrong please help...

Hi,

Although this aircraft is certified for up to 35,000 ft, it is usually not flown above 32-33,000 ft. That's because the cabin altitude will be on its limit of 10,000 ft for passenger comfort. Due to cabin pressure leakage, which is normal in real, you'll get 10,000 at about those altitudes. Flying at 35,000 will trigger the CAB HI warning message (above ~ 11,000 cabin altitude) and oxy masks will deploy, which I guess you won't like to happen.

Now, regarding your lack of pressurization, it seems you have all set correctly (cannot confirm if PRESS switch in in the normal position or not). Are you following the proper procedure on how to load the aircraft from Scenario screen? Are you changing date/time values within a loaded flight?

Your blowers are off

No. Those are the AUTO positions. Blower speed is auto controlled by Environment system.


Tomas

[Raptor]

Blowers are in straight down position... Auto is the first position to the left?

2020-6-30_11-45-8-586.jpg (218.35 KiB) Viewed 2435 times

[Taguilo]

Blowers are in straight down position... Auto is the first position to the left?

No. It may look weird, but AUTO is with Blower straight down. In that position speed is linked to Environment Control's current mode/switch position.

In fact, unless there is a specific need, blowers are left full down for the entire flight.

Tomas

[curtoavida]

Although this aircraft is certified for up to 35,000 ft, it is usually not flown above 32-33,000 ft. That's because the cabin altitude will be on its limit of 10,000 ft for passenger comfort. Due to cabin pressure leakage, which is normal in real, you'll get 10,000 at about those altitudes. Flying at 35,000 will trigger the CAB HI warning message (above ~ 11,000 cabin altitude) and oxy masks will deploy, which I guess you won't like to happen.

Now, regarding your lack of pressurization, it seems you have all set correctly (cannot confirm if PRESS switch in in the normal position or not). Are you following the proper procedure on how to load the aircraft from Scenario screen? Are you changing date/time values within a loaded flight?

Your blowers are off

No. Those are the AUTO positions. Blower speed is auto controlled by Environment system.


Tomas
[/quote]

Thanks for your answer Tomas, i never change date, time, weather, after start up scenery or after load aircraft i know can’t do this.... i read about this in this forum already... but i change aircraft payload and fuel using P3D default payload changer for set aircraft weight... may this is the wrong thing i doing??...

And Blower switch need to be at “Blower” position??.. for air come inside aircraft and pressurize it??..

And another question i can’t fly about FL-32,330?.. need to fly always(For example) FL-260,280, or 30,32, or 35.000??.. never can fly at FL-170,210, or 290??.. for pax comfort?...

[Taguilo]

And Blower switch need to be at “Blower” position??.. for air come inside aircraft and pressurize it??..

And another question i can’t fly about FL-32,330?.. need to fly always(For example) FL-260,280, or 30,32, or 35.000??.. never can fly at FL-170,210, or 290??.. for pax comfort?...

Blower position full down (pointing 180 degrees) is Ok for almost all situations. For cockpit Blower, you can use the manual mode, increasing the speed in case you need to defog vent windows.

Regarding your last sentence, what do you mean by "cant fly about FL-32-330' ?


Tomas

[curtoavida]

And Blower switch need to be at “Blower” position??.. for air come inside aircraft and pressurize it??..

And another question i can’t fly about FL-32,330?.. need to fly always(For example) FL-260,280, or 30,32, or 35.000??.. never can fly at FL-170,210, or 290??.. for pax comfort?...

Blower position full down (pointing 180 degrees) is Ok for almost all situations. For cockpit Blower, you can use the manual mode, increasing the speed in case you need to defog vent windows.

Regarding your last sentence, what do you mean by "cant fly about FL-32-330' ?


Tomas

Hello Tomas, Please forget what i sayid about flight levels i understood wrong..., let’s back to topic

So i try to do like you sayid but nothing change i can’t make plane pressurize yet... so if you can answer my question please...

Do i change aircraft weight with P3D default changer in “Fuel and payload”Menu may this will bug aircraft?..

When i start cockpit preparation i turn on battery after put external power, test alarms, lights, Etc... after i turn on cabin press dump switch and i set pressurization 1.000 above the Crz Level... after i put route on FMS... then i start engines with external power on following aircraft manual for start engines with external power... and reset Generators and disconnect external power..., then i turn on Bleed air valves and turn blowers switch for auto position start taxi, before takeoff i put condition levers in high idle and i takeoff monitoring iTT... after 10.000or 11.0000 i have “Hi did cabin” msg in red color and cabin altitude alarm sound comes up...,

May better i use MVMS for set my aircraft weight??.. thanks Tomas...

[Slayer]

Yes you should use MVAMS to set your cargo and fuel load before a flight and also refresh your engines while you are in there. Sounds like you are running your pressurization at the extreme level of the aircrafts performance at FL350. specs are limited to FL350 so if you are setting for FL360 it can never attain that. Try your flight at a lower flight level. Your setup sounds right but if you are getting a warning at 10k something has to be missing in your preflight, just not sure what.

[Taguilo]

When i start cockpit preparation i turn on battery after put external power, test alarms, lights, Etc... after i turn on cabin press dump switch

With that switch in DUMP position you'll never pressurize the aircraft. It is intended to dump (quickly reduce) pressure in case of CABIN DIFF HIGH warning message, or when landed with a pressurized cabin.

Tomas

[curtoavida]

Yes you should use MVAMS to set your cargo and fuel load before a flight and also refresh your engines while you are in there. Sounds like you are running your pressurization at the extreme level of the aircrafts performance at FL350. specs are limited to FL350 so if you are setting for FL360 it can never attain that. Try your flight at a lower flight level. Your setup sounds right but if you are getting a warning at 10k something has to be missing in your preflight, just not sure what.

Thanks Slayer for your help so i never can fly in FL350 because pressurization not work good??.. but when i want to fly in FL350 can i set pressurization to 360??.. or i have to set to 350??..

[curtoavida]

When i start cockpit preparation i turn on battery after put external power, test alarms, lights, Etc... after i turn on cabin press dump switch

With that switch in DUMP position you'll never pressurize the aircraft. It is intended to dump (quickly reduce) pressure in case of CABIN DIFF HIGH warning message, or when landed with a pressurized cabin.

Tomas

Oh Fuc’#% so now i know why never can’t pressurize it... ...

i will do a flight today Lipe >> Loww and i will try to pressurize aircraft again, after i back here and post result thanks for all until now...

[ccmh15]

I exclusively use the P3D "Fuel and Payload" dialog to set Pax, Cargo and Fuel, and it always works perfectly fine (both in P3Dv4 and v5)

I once even used it while airborne for a little "in-flight refuelling" out of curiosity, this also worked without a problem - even the Fuel on Board value in the FMS got updated correctly!

[Slayer]

This aircraft can be tricky and lots of lessons to be learned. Good luck , let us know how your flight goes and I can mark this as resolved.

Thanks.

[curtoavida]

Thanks Guy i could make plane pressurize good... no problems with my last flight Slayer you can close this topic now... Thanks Milviz Team for help... and (ccmh15) thanks for your help too....