At my FBO the line guys do it. They charged me $75 last time I had it done in July, 2021. Capacity of my bottle is 500L. But it wasn't empty. Bottom of the green arc is 1,600psi and top is 1,800psi. They actually overfilled it a bit to ~1,900psi. Relief valve (blow out disk) is at 2,500 so no issues there.

Speaking of tires, I was told during my type rating that we aren't supposed to fill our own tires since they are >60psi. I told my instructor that I would be sure that the tires were only serviced by approved maintenance personnel from then on

I assume he quoted you which FAR said that, right?

In the serving section of the operating manual:

Sure go into a lot of detail if the pilot isn't allowed to do it. I do it myself.

Tire pressure vigilance is a major deal with jets. The maintenance manual has some pretty severe limits when it comes to underinflation.

Goodyear says if the tire was rolled at 80% of less of inflation, or reaches 50% or less of inflation unrolled, the tire should be replaced.

You do NOT want to be needing a tire right now, hard to find.

Mike C.

Be wary of obvious under inflation on duals that can cause a tire fire prior to liftoff.

Ah, but do you use air or nitrogen?

Nitrogen, of course.

FBO has a tank they let me use.

Since my mains are 140 PSI, kind of hard to use an average air compressor in any case.

Mike C.

I'm not sure if aircraft inventory levels are low because of the Williams engine program or lack of nitrogen in the tires.



Jg

Absolutely part of the problem, exacerbated by the unclear status of the Space Station's future, combined with the very real concern that the Cold War between Ciholas and McClure may turn into a real shooting war with a direct impact not only on inventory levels, but the continued availability of complimentary coffee at most FBOs.

Absolutely part of the problem, exacerbated by the unclear status of the Space Station's future, combined with the very real concern that the Cold War between Ciholas and McClure may turn into a real shooting war with a direct impact not only on inventory levels, but the continued availability of complimentary coffee at most FBOs.

I do as well. That was why I thought it was funny. I bought a cylinder and regulator from Aircraft Spruce. I'm sure I overpaid buying a kit like that but it just works.

It is possible I could be the only one who actually follows those rules.

The target pressure varies with temperature quite a bit:

If the temp is about 90F, then 1900 PSI is correct even though it is outside the green arc. The 1800 Psi is at 70F and you change about 5 PSI for 1F change.

This chart is particularly important when filling in the cold. If you put in 1800 PSI at 0F, that will be 2300 PSI at 90F which starts to get close to the blow out disk.

Also, "stabilized pressure" is when the tank is cooled down to ambient. That may not be the temperature right at the moment you fill it. This is particularly true if the filling system has any sort of compressor which elevates the temperature of the oxygen.

This chart from chapter 12 of the MM, Servicing.

Mike C.

There is nothing on the net (other than this thread) about Aircraft inventory levels being critically low, fake news.

Makes as much sense as the famous quote: "The chances are almost 100% that we have to find that airplane off market, there's just nothing out there"

Let's not forget this bit, what a surprise: "We have access to off-market turbine aircraft!" in every post, or
"most of the aircraft advertised for sale on Controller either aren't real or are already sold."

Then there is "acquire"

There is nothing on the net (other than this thread) about Aircraft inventory levels being critically low, fake news.

Makes as much sense as the famous quote: "The chances are almost 100% that we have to find that airplane off market, there's just nothing out there"

Let's not forget this bit, what a surprise: "We have access to off-market turbine aircraft!" in every post, or
"most of the aircraft advertised for sale on Controller either aren't real or are already sold."

Then there is "acquire"

For what its worth I used Chip to find and acquire my V and it was an off market plane that was only found through his network. 2 months after I bought it the previous owner reached out and wanted to buy it back for $200k more than I paid for it. Take that info for what its worth and make up your own mind.