7 hours ago, Farlis said:

How about you guys just answer the question instead of lecturing him about units?

 

To answer the question: One of the line keys of the PFD will have that option. Just look click through them until you find the one for BARO and there you can also set it to STD above transition (although that you probably never have to do in a C172 in the U.S. considering these don't fly up to 18.000 feet.)

arbt, noticed that the OP asked a question that didnt really make sense as he was mixing up units with reference points (QNH) is not a unit)  he made a fine attempt at straightening this out then the poor guy gets called out for it.

The OP really should have asked either how to change from in/hg to hpa  - mb or how to change from QNH to QFE, its impossible to tell which question he is actually asking from the way its originally worded, thats all

 

tbf, most of the following answers including yours just confused the matter further.

 

Edited December 15, 20241 yr by Rusty Spanner

2 hours ago, Rusty Spanner said:

he made a fine attempt at straightening this out then the poor guy gets called out for it.

The OP really should have asked how to change from in/hg to hpa  or mb, thats all

100% agree. a classic example of a thread going wrong just because of misunderstanding/confusing initial question.

I appreciate yours and and arbt's comments!

"The OP really should have asked how to change from in/hg to hpa  or mb"

and the answer is: you can't for the C172 analog version. even after changing units of measure to U.S. to inHg - inches of mercury , it didn't change the C172 altimeter to reflect that.

Edited December 15, 20241 yr by turbomax

1 hour ago, crimplene said:

The Standard Version comes with a C172 that has a "Basic" version with all the analog instruments. The altimeter has only a QNH scale asfaik - does'nt bother me but stil.

This thread is full of misunderstandings. No such thing as a QNH scale, please read arbt's explanation.

28 minutes ago, Rusty Spanner said:

please read arbt's explanation.

and this might help:

https://www.aviationfile.com/qnh-qne-qfe-usage-definitions/

53 minutes ago, Rusty Spanner said:

This thread is full of misunderstandings. No such thing as a QNH scale, please read arbt's explanation.

Right. It's an inHg scale. :-)

1 hour ago, Rusty Spanner said:

arbt, noticed that the OP asked a question that didnt really make sense as he was mixing up units with reference points (QNH) is not a unit)  he made a fine attempt at straightening this out then the poor guy gets called out for it.

He only did that because he probably only read the thread title instead of reading the opening post.

Despite using the wrong term for millibar vs In/hg, that post made it clear what the question was really about.

"Right. It's an inHg scale. :-)"

no,  exatly the opposite. the MSFS2024 C172 altimeter is now showing the metric unit of millibar hPa. OP wanted to know how to change FROM millibar TO inHg, and that seems not possible for the analog C172. in MSFS 2020, the C172 altimeter used the U.S. system of inHg, whereas MSFS2024 has changed that but only for the C172, not the C152, not the C208B, bug or feature?

Edited December 15, 20241 yr by turbomax

13 minutes ago, turbomax said:

"Right. It's an inHg scale. :-)"

no,  excatly the opposite. the MSFS2024 C172 altimeter is now showing the metric unit of millimeter hPa. OP wanted to know how to change FROM mm TO inHg, and that seems not possible for the analog C172. in MSFS 2020, the C172 altimeter used the U.S. system of inHg, whereas MSFS2024 has changed that but only for the C172, not the C152, not the C208B, bug or feature?

Are you talking about the analog 172 in the Deluxe version of MSFS2024? I might misremember the scale of the "Basic" configuration of the 172 in the standard version, though.

 

But actually, the only thing I really wanted to say above is that the Standard version of MSFS 2024 HAS an analog C172 because someone claimed otherwise.  So sorry for the additional confusion I brought into the debate.

Edited December 15, 20241 yr by crimplene

3 minutes ago, crimplene said:

Are you talking about the analog 172 in the Deluxe version of MSFS2024?

yes. I am not familiar with a BASIC version of the standard edition.

1 hour ago, crimplene said:

the Standard version of MSFS 2024 HAS an analog C172 because someone claimed otherwise.

that "someone" would be me 😀

never heard of an analog BASIC C172 in the standard edition, but if you say so, so be it.

51 minutes ago, turbomax said:

that "someone" would be me 😀

never heard of an analog BASIC C172 in the standard edition, but if you say so, so be it.

I mean it is strange that the C172 named "Cessna 172 G1000)" (or something to that extent) has a configuration (named "Basic" in the list of configurations) with analog instruments when at the same time they promote the analog C172 as a Premium Deluxe aircraft. I suppose it's something of an oversight. But since I have the Standard version of 2024 and I flew this exact same aircraft today (albeit not remembering if the analog altimeter has an hPa or an inHg scale), I can assure you that this plane exists. You probably can find it in the Premium Deluxe version too when choosing the G1000 C172 and then choosing "Basic" in the configuration of that plane. Not that there is any need. ;-)

Edited December 15, 20241 yr by crimplene

4 hours ago, turbomax said:

and the answer is: you can't for the C172 analog version. even after changing units of measure to U.S. to inHg - inches of mercury , it didn't change the C172 altimeter to reflect that.

 

Thanks for get me the answer - saving me the trouble and time to figure out this is another bug. Shame on Asobo.

It's of course my fault conflating QNH etc with hPa. I only fly and train in GA airplanes in US and this can make me really word not allowed about the rest of world. I read four FAA books nearly from cover to cover: 

FAA_Airplane Flying Handbook

FAA_PHAK_Pilot_Handbook
FAA-H-8083-15B_Instrument Flying Handbook
FAA-H-8083-16B_Instrument Procedures Handbook

Just checked, only the Instrument Procedures Handbook has a few paragraphs of "Operation in Other Countries" talking about QNH, QNE etc. The other three books never even mentioned word "QNH" etc. 

Right now I just refreshed my brain to remember again: QNH = MSL, QFE = AGL, QNE = pressure altitude. I'm pretty sure next time I'm posting I probably already have forget these again... 

 

i*gnor*ant is a "word not allowed"? Gees, that's a bit too sensitive. 

2 hours ago, crimplene said:

You probably can find it in the Premium Deluxe version too when choosing the G1000 C172 and then choosing "Basic" in the configuration of that plane.

you're right, I just never expected the analog C172 version included in the standard edition, since that was never announced by Asobo.

another issue I came across: LSZH Zurich - MSFS 2024 ATIS reporting QNH of 1038 which is consistent with what I see on Skyvector. But when I adjust the C172 altimeter to 1035, the altimeter read 0 for elevation, when it should be 1417 feet. what gives?