The ARM mode is not only VS mode, it’s also altitude capture and hold. VS only mode is the button above ARM. I only use ARM anyways, so I guess it’s not a major issue.
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I’ll try VS right now as I’m planning a mooney trip 
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Thanks Gents! For the sake of duplicating the dive, try this as shown below before take off. Basically, I set it like that so after take off, I will just hit the AP ON, then press the VS. Take note, VS is not lit initially.
Try if you can duplicate it. Anyway, I don’t do above now, and all works fine but I can always duplicate the dive with positive climb fpm indicator.
I confirm VS mode is working as expected
Huh. Did you try setting it to a high number like 4,000 or even 5,000 fpm?
no, I used 1400fpm and nothing above 1500, just like you would do IRL
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Hi @quelcertoleo . I used 1,000 fpm. See below photo.
It’s indicating positive 1,000 fpm. AP on NAV.
Plane is diving at -1000 fpm.
What is your target altitude set to? The Mooney will climb at 1000 fpm if your target altitude is above you and descend at 1000 fpm if your target altitude is below you.
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Thanks. To answer the question, it’s 4500 ft. This happened after take off and AP was turned on. At least, 2 of us able to duplicate this diving scenario. Community folders empty. The Mooney by default, the VS is set to -700 fpm. And the ARM is by default set to +- 500 fpm.
Your Alt selector seems not o be in armed mode, can you check this ?
Mine is working very well , I get 500 Ft/min up when I select an altitude above and 500Ft/min down when it’s under so, it’s OK AND I can easily move it to 800 Ft/min up when climbing, which is a good speed for the Mooney until FL80.
500 Ft/min down is good for the Mooney, it allows you to keep 16 on AP and the engine doesn’t get too cold , not to exceed 210 knots (airbrakes are here if necessary) and keeps ears OK !!!
I still have troubles with my APR mode on the AP which works … sometimes !!!
Everybody has is own trouble 
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Hi. ARM mode is working fine. It’s default is +- 500 fpm. The one having issues (at certain situation) is the VS. It’s default value is -700 fpm, right? Not sure if this is the same with real plane that default value is -700. I read the available real life manuals but it does not say about this default value.
Anyway, I avoid the situation already. I still engage VS or ARM in a situation that is working on me. Thanks.
I think I’ve said this before but I’ll say it again.
The Mooney altitude preselector has TWO modes. One is purely VS, where the aircraft will climb INDEFINITELY at the VS you choose. This is engaged by the “ENG” button on the preselector.
The other mode is altitude capture, which climbs at the VS you choose (by default plus or minus 500 fpm) UNTIL YOUR CHOSEN ALTITUDE, where it levels off. This is engaged by the “ARM” button on the preselector.
The diving issue only happens on the “pure VS” mode. I never use it anyways, but it’s there.
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THat VS ( top button) will cause the aircraft to go into a dive, in my experience. I never touch it. Just use the bottom button as described in the video. Then adjust the climb or descent rate , Works every time.
I still experiencing ctd on this aircraft, especially when I was flipping switches prior to landing.
Did you (try to) land on an add-on airport? Because that might also be the case causing a CTD right now…
no, just random small airstrips assigned by skypark
It is not the Mooney - it’s the CGL file from the Airport. Make a copy - rename it and no more CTD.
Once in the future you can change it with the copy you made.
but I didn’t try to land on any of the hand made airport, just the vanilla one
I have an issue with the Mooney autopilot.
The ALT button correctly captures the current altitude as displayed by the altimeter.
This means the display shows the same altitude like the altimeter.
Barometric pressue is different from ISA at 30.77Hg.
When i now press ARM, the autopilot will start to climb to the altitude in reference to standard pressure, e.g. from 4000 to 4800ft.
If you press the “B” key it should calibrate your altimeter to current pressure. That is a standard MSFS game mapping.
Note that with the Mooney autopilot hitting alt engages hold mode. If you then want the AP to climb or descend for you dial in a different altitude and then hit alt to flip to VS mode and set your desired climb or descent rate. If you do not touch anything else it should start to climb or descend to your selected altitude.
There is a freeware gn530 mod about that improves the GPS substantially.
Also note there is some basic documentation in pdf form for the Mooney in the install folder.