Hi,On my copy of the PMDG 737, cabin altitude climbs too high. The cabin pressure gauge indicates about 11 to 12 thousand feet at typical cruise altitudes of FL310+. On most commercial airliners cabin altitude shoud be around 8000 feet. I have both PACKS on, center isolation valve set to AUTO, both engine bleed air valves on, APU bleed off (when airborne). I have the correct altitude set for cruise and landing, as well as the outflow valve set to AUTO. I seem to get adequate duct pressure indications, just too high of a cabin altitude displayed on the cabin pressure gauge.I think the cabin pressure was working okay with the base install of the 737 and began to have erroneous readings after upgrading to the 800/900 series. I have all of the latest patches installed.I wonder if anyone else has experienced the same thing?Thank you.

There may be a few anomalies in this area, Dianne (known an unknown). Did you start up your aircraft from a dead ship/or on the ground or start up from an inflight session? Sometimes starting at high altitudes (e.g. in cruise or at high airfield elevations) appears to upset the correct sequence of pressurization. If you start up the sim at sea level, you generally get a pretty accurate cabin pressurization profile.Also, it's probably not the best to mess around with the manual controls at high altitude.Hope this helps.Cheers.Ian.

Hi Ian,So far I've tried everything imaginable from starting from a cold cockpit at sea level to switching from a default FS2004 plance on startup, ect. My darn cabin pressure just will not work right. I have confirmed that on my original 1.3 version 737-600/700 base installation (without the 800/900 upgrade) that my cabin pressure is working correctly in every situation without fail. Only after installing the latter upgrade is the cabin pressure anomaly introduced. So something is definitely screwy with the 800/900 series upgrade on my computer. I the latest service release for the 800/900 series installed as well.I must be the only one having this problem. My computer is stupid and I'm mad at it! Grrrrr!!!Thank you very much for taking the time to respond to my question!

I hate my comp to, but to be honest the feling is mutual. if my cab. press. is not holding, i try not to notice. unless im flying the real thing then everyone notices. I have flown through salt lakes airspace in the past, and now i can put a face to the voice. Hope you got the problem with the cab. press taken care of ? But, if your are still having problems there is always the "Try not to notice" over-ride Scott, Capt. 737/800 (BBJ)

Interesting thing.Did you try reinstalling the PMDG (removing it first with the PMDG removal tool)?I just made the test flight and pressure in the cabin as far as I could see at FL310 was reported little below 10,000ft.But if I reset the PACKS in the flight, say turn off both and then turn it back on, it displays false.Don't know what's wrong...:(

"I must be the only one having this problem."Not quite, Dianne. Others have reported it previously. Strangely, I actually faulted it tonight, but it may have been the result of using time acceleration and perhaps pausing the sim every now and then. When I reset the situation, made the same flight without acceleration, all was well.Perhaps something for the PMDG team to look at after the 744 has been released?Cheers.Ian.

OK well, definitely a bug or something else.PMDG mind to comment please?I'm right now doing a flight from Venice to Gatwick, at FL320. Cabine altitude is reported to be little below 15,000ft (on the cabine pressure gauge), and differential pressure little less than 4.From my understanding and what I read about cabine altitude, it should NOT go over 8,000ft, and if it goes over 10,000ft, ALT HORN warns you about too high cabin altitude. There is no horn, I guess that's not modelled, but what about that cabin alt setting?One also cannot switch to manual and control the valve with the switch - also no effect.

Dianne et al,I brought up this exact same issue several months ago long before the official 800/900 patch was released this past July. I've never received one comment or acknowledgment from any representative of PMDG. The cabin pressure problem is obviously experienced by several users and yes, it's related to the 800/900 update as I too did not have the problem with the 737 version 1.3Not only does cabin pressure not read correctly on the gauge, you'll find that if you shut off the packs and close the engine bleed air valves, ect, the cabin pressure gauge goes completely loopy. You won't receive any visual or aural warnings either to coincide with the erroneous readings. The pnuematics are completey screwed up with the 800 series update, at least for a good number of users like we.It would appear there are certain issues PMDG would rather ignore than address.

No one is ignoring anything. There appears to be a problem with the gauge reading under some conditions that should not be. PMDG are aware of it as they are with certain other issues with the plane. This certainly is not the only issue. To be candid IMO, it's not stoping anyone from flying this aircraft is it? There are more serious issues that needed to be fixed and were addressed in the update. As we know, it's not 100% and never will. This sim cannot simulate loss of cabin pressure (you will not get ears poppin or ox masks droppin etc) so of course if one looks hard enough you will find issues such as these. While it would be great to have every single items addressed, accusing PMDG in such a way accomplishes nothing. I THANK PMDG for all the fixes they have completed of late on the 737 NG series. It certainly is a long list of serious issues fixed. As one example was the engine failuers when the main tank went empty. Now this did effect a flight in a very real way. So what am I trying to say here? Make lists of these things and ask if they might get addressed in a future update. As we also know PMDG are no longer working on the NG as the production is 100% geared for the 744 as it should be. I hope along with others that PMDG get as much done as possible on the NG in a future update. ==RUGERDOG== Sir, you been around here long enough to know to use your real name as the forum rules state. PMDG do not normally answer nameles posts and seeing that you are not new here, I could understand why your post would be ignored. So please sign your name and maybe you will be addressed and answered. Best Wishes,[h4]Randy J. Smith[/h4][h3]P M D G's 747-400[/h3][h4]coming to a runway near you[/h4][/font color]Caution! Not a real pilot, but do play one on TV ;-)AMD 64 3200+ | ASUS KV8 DELUXE | GFORCE 5700 ULTRA @535/1000 | Maxtor 6Y080M0 SATA 80 GIG | 512 DDR 400 | Windows Xp Pro | Windows Xp Pro 64 |

Dear Randy,Thank you. I find your response, well - let's no get into here because they (PMDG) will just delete my post right off and that will be the end of it. In your heart I'm sure you know what I want so desperately to say to you :)Okay, okay. Thank you for at least 'officially' acknowledging this problem with the cabin pressure gauge. This is the ONLY time I'm personally aware that they (you, them) knew about this problem. It's frustrating when individuals such as Dianne, myself, 747Pilot, Qavion, et al. experience issue like this and PMDG do not make any responses even though they are aware of the problem. I'm sure you can sympathize with this.Geez Randy, why aren't you on the PIC v2 team instead of being counselor for the defense here? You are better than this as your past panel accomplishments attest. I would use my real name but ever since John Walsh and his #@#*$$&!!#&! America's Most Wanted show broadcast that story about me I've had to lay low. Nothing personal.

Qavion, let's just say he has a direct line to the team, he does not ask questions that don't get answers even if that appears to be the case on the forum, one example of something the casual reader does not know. I also think you know that I desire the 737 to be "perfect". While it only appears here that I am in defense mode, in reality I make many suggestions from things read here and my personal desires for the 737. But reading through this thread, I felt some comments were out of place and not correct and being true to who I am touched upon this. Just like it is your right to speak up, it is my right to speak up too. So what do we have here? We have a issue with the altitude cabin pressue gauge. Is this so critical to your an my flight simming to make using the product unstable or unusable? The aircraft does not have an IRS system yet thousands of users seem to have a good time using this sim. Does this lesson the importance to any of these issues? No. PMDG read every post even though they don't comment on every single post. Now, us regular forum users discuss these things and this is always a good thing if we have a mutual respect for PMDG and each other. I don't know you personally and will not make jugdments upon what I think would touch upon you personally so show me the same respect. Speak, suggest and share. That's what this place is all about. I don't think asking for some tact in our suggestions or comments is too much to ask for even though I am not a moderator. I just believe we can accomplish much more this way and certainly others will benefit from our discussions and if we are lucky will make a good impact on the team to take our suggestions and implement them... Best Wishes,[h4]Randy J. Smith[/h4][h3]P M D G's 747-400[/h3][h4]coming to a runway near you[/h4][/font color]Caution! Not a real pilot, but do play one on TV ;-)AMD 64 3200+ | ASUS KV8 DELUXE | GFORCE 5700 ULTRA @535/1000 | Maxtor 6Y080M0 SATA 80 GIG | 512 DDR 400 | Windows Xp Pro | Windows Xp Pro 64 |

Hi Scott, I think I've found the source of the problem - it's the clickable VC cockpit models only that experience this, at least on my computer. The 2D panel only models seem to work fine.I might have very well talked to ya if you were in my airspace. :)

The clickable VC's seem to be the culprit Ian. :)