I sure find these videos explaining the different systems very interesting. Thanks for taking the time to share some of your knowledge with us Jerry! I hope you and your family had a great Thanksgiving.
Hi Jerry- love your videos, but it seems your understanding of the pressurization system is not accurate. Your cabin pressure does not maintain sea level when you set your cruising altitude on the outer ring. The pressurization system will simply put the cabin at whatever altitude you set on the outer ring. So setting your cabin altitude to your cruise altitude is the exact same thing as flying an unpressurized airplane. If you want to cruise with the cabin at sea level, then the outer ring should be set to Sea Level. You only need to adjust the pressurization above sea level (or takeoff airport altitude) if you fly above the minimum altitude to which the airplane can maintain pressurization at sea level, which is 11,000 feet because that’s where max differential of 5.0 psi is reached. If you know you’re going to cruise above 11,000 feet, then set the altitude for your cruise at the INNER ring and it will show you what your cabin altitude has to be (on the outer ring) without exceeding 5.0 psi differential. In all cases however, you should have the outer dial set to your landing airport elevation +500 before touchdown. So if you fly up to Mammoth Lakes airport, be sure your pressurization is set to 7000 feet on the outer dial so when you land, the cabin pressure is the same as the outside pressure on the ground at Mammoth airport. Hope that helps clarify the system a little better.
Spot on. If you're going to provide an overview of how something works, at least understand how it works. And the most valuable part of understanding how it works? You can recognize when it isn't working right :D
Hey Jerry. Hope you had a great Thanksgiving. The maximum differential on your airplane (and all 414A's and 421C's) is 5.0psi. If it won't pressurize beyond 4.5psi, there's something wrong. Also, setting 3.5 on the outer scale when the airplane is cruising at 3500ft is asking the cabin controller to provide a 3500 cabin at 3500ft. In other words, it results in a differential of zero and a completely depressurized airplane, and there'd be no value in that setting. I also heard you mention that while at 3500ft, setting 2000ft on the cabin controller gives you a sea level cabin. If that's the case, there's something wrong with the system. Setting 2000ft while the airplane is at 3500ft should give you a 2000ft cabin.
it was a general review of the system not a technical outline, I have found on both my old 414 and this plane the pressurization system does not work exactly as it did when it came out of the factory 45 years ago.
1/30/22; just watched yur flight from Oakland to Auburn. Much enjoyed your camera close-ups of Garmin instrument panel, your red pen pointing to several important parameters then very close-up view of cabin psi turn knob. Here your explanation of outer ring (altitude) & inner 'window' turning knob was interesting & again shows us armchair viewers the splendid technology you have mastered. Also love your approach to land, especially that 180° turning-descending-roll while descending roll on base leg
Just after 13 minutes on the video is the cruise altitude setting 16,000 feet and the corresponding cabin altitude 3,500 feet? Not 3,500 feet cruise altitude which happens to be the altitude at which the aircraft is actually flying? Thanks for the video.
I sure find these videos explaining the different systems very interesting. Thanks for taking the time to share some of your knowledge with us Jerry! I hope you and your family had a great Thanksgiving.
Hi Jerry- love your videos, but it seems your understanding of the pressurization system is not accurate. Your cabin pressure does not maintain sea level when you set your cruising altitude on the outer ring. The pressurization system will simply put the cabin at whatever altitude you set on the outer ring.
So setting your cabin altitude to your cruise altitude is the exact same thing as flying an unpressurized airplane.
If you want to cruise with the cabin at sea level, then the outer ring should be set to Sea Level. You only need to adjust the pressurization above sea level (or takeoff airport altitude) if you fly above the minimum altitude to which the airplane can maintain pressurization at sea level, which is 11,000 feet because that’s where max differential of 5.0 psi is reached. If you know you’re going to cruise above 11,000 feet, then set the altitude for your cruise at the INNER ring and it will show you what your cabin altitude has to be (on the outer ring) without exceeding 5.0 psi differential.
In all cases however, you should have the outer dial set to your landing airport elevation +500 before touchdown. So if you fly up to Mammoth Lakes airport, be sure your pressurization is set to 7000 feet on the outer dial so when you land, the cabin pressure is the same as the outside pressure on the ground at Mammoth airport.
Hope that helps clarify the system a little better.
Spot on. If you're going to provide an overview of how something works, at least understand how it works. And the most valuable part of understanding how it works? You can recognize when it isn't working right :D
you are absolutely right. It seems like you understand that system much better than Jerry.
Hey Jerry. Hope you had a great Thanksgiving. The maximum differential on your airplane (and all 414A's and 421C's) is 5.0psi. If it won't pressurize beyond 4.5psi, there's something wrong. Also, setting 3.5 on the outer scale when the airplane is cruising at 3500ft is asking the cabin controller to provide a 3500 cabin at 3500ft. In other words, it results in a differential of zero and a completely depressurized airplane, and there'd be no value in that setting. I also heard you mention that while at 3500ft, setting 2000ft on the cabin controller gives you a sea level cabin. If that's the case, there's something wrong with the system. Setting 2000ft while the airplane is at 3500ft should give you a 2000ft cabin.
it was a general review of the system not a technical outline, I have found on both my old 414 and this plane the pressurization system does not work exactly as it did when it came out of the factory 45 years ago.
1/30/22; just watched yur flight from Oakland to Auburn. Much enjoyed your camera close-ups of Garmin instrument panel, your red pen pointing to several important parameters then very close-up view of cabin psi turn knob. Here your explanation of outer ring (altitude) & inner 'window' turning knob was interesting & again shows us armchair viewers the splendid technology you have mastered. Also love your approach to land, especially that 180° turning-descending-roll while descending roll on base leg
Nice short approach and landing. You handle that twin very well.
These are the best! Keep em coming Jerry!
Thanks for the video Jerry. I was away for a bit, so I'm going to have to go back and binge watch. 😁Hope you had a Great Thanksgiving.
The big jet was an airbus with the brow cut on the side cockpit window
Good stuff, Jerry. Nancy is a fine SIC! Thanks!
At 3:30, making a left turn and crossing the dashed taxi edge marking to look at another plane when you’re at a tower controlled airport? Nice!
Like your choice of dramatic music ;)
Just have to love it when the controllers say, "Hi Jerry." It really is too bad we can't use our own sound clips with the Garmin annunciation system.
Thanks for having us .... just sayin' ..... Hi Nancy ....... ;-p
I'm looking forward to the acrobatic capability video of the 421 😊
That's going to be a rather boring video...🤣🤣🤣👍
and rather short also.......
Just after 13 minutes on the video is the cruise altitude setting 16,000 feet and the corresponding cabin altitude 3,500 feet? Not 3,500 feet cruise altitude which happens to be the altitude at which the aircraft is actually flying? Thanks for the video.
Thanks Jerry, reminds me of the #33 runway at Oakland on short final landings. Good afternoon to fly.;)
Jerry looks like someone’s aunt’s boyfriend
Merci, nice to see Madame
Thanks I enjoy learning about systems on airplanes and thats no taildraggin piston popper.
Would u give me some info on 421 or 414
watch my videos
@@Jerry.Wagner I do trying to decide which to buy
reply with your contact info, the reply will be captured and I will delete it
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