Highest Flight Level?

[Pilotforhire587]

You should get some kind of medal just for that. I clawed my way to 250 a couple of times in the three bladers, and I think maybe 270 in a Marquise once just to see if I could do it. I'm pretty sure that one would have fallen out of the sky before it hit 290.

It was cool to be up there, Just two of us in the Marquise. Dash 10's are the way to go man.

 

[ASpilot2be]

It was cool to be up there, Just two of us in the Marquise. Dash 10's are the way to go man.

What do most MU-2s have? The CASA 212s have the TPE331-10R-511C engines, and I think 25,000 is the max altitude.

 

[Pilotforhire587]

Most turboprops being certified to only go to 250 has nothing to do with the engines but the pressurization system, just like the DASH. The engines can go much higher but the airframe isn't designed for the pressure.

 

[ASpilot2be]

Most turboprops being certified to only go to 250 has nothing to do with the engines but the pressurization system, just like the DASH. The engines can go much higher but the airframe isn't designed for the pressure.

Ah,that makes sense.

 

[Pilotforhire587]

You will have to ask some of the Jet guys but the Dash is only certified for a pressure differential of 5.95PSI max. Normal is 5.5, I'd imagine a lot of the RJ's are in the 7.5 or 8 range, and larger Boeing aircraft being ever more.

 

[ASpilot2be]

You will have to ask some of the Jet guys but the Dash is only certified for a pressure differential of 5.95PSI max. Normal is 5.5, I'd imagine a lot of the RJ's are in the 7.5 or 8 range, and larger Boeing aircraft being ever more.

Interesting. The CASA is not pressurized, so that is one less thing to worry about for us.

 

[knot4u]

G-IV max diff psi= 9.8

 

[dasleben]

I'm surprised you guys know max pressure differentials off-hand.

 

[SteveC]

Lear 40/45 9.4 psi; 8,000 foot cabin at FL510.

 

[knot4u]

I'm an A/P, we have to test the safety valve. If you've had a recent cold or sinus problems or have trouble adjusting your ear pressure stay out of the airplane. Interesting to watch the skin "pillow" and the cabin windows bulge from the outside. At FL45 in a G-III in the cabin hearing creaking noises is a little disconcerting.

 

[crazyjaydawg]

I've rocked FL250 in a piston single many times, man do O2 masks suck!

 

[knot4u]

If you really want to have fun take a 30 series LR into the high FLs (for troubleshooting) and enjoy emergency pressurization.

 

[knot4u]

Forgot to add, my best as PIC FL098 PA-28-161.

 

[dasleben]

FL075...in a Skyhawk haha. I rarely cruise above 055 or 065 since that gives me plenty of space between me and most mountians en route and doesn't take forever to get up to.

FL75, you mean?

 

[Pilotforhire587]

I'm surprised you guys know max pressure differentials off-hand.

Memory items man. Max differential on the ground is .5PSI. Oh but the things I probably don't remember.

 

[DPApilot]

250 in the 'Hundo. Max service, but flys well up there. Nothing like hand flying all the way. 260 in a Meridian with CK.

 

[N519AT]

I thought the 250 limit was because of the lack of O2 masks in the back for the pax?

IIRC the Dash has something like a 7000-8000 ft cabin at 250.

 

[DPApilot]

Did sfc-14,500 today outta MYAM in 4 minutes. 122 kias.

 

[Pilotforhire587]

I thought the 250 limit was because of the lack of O2 masks in the back for the pax?

IIRC the Dash has something like a 7000-8000 ft cabin at 250.

that too, But it is also a pressurization limit.

 

[Bandit_Driver]

Boeing 727 max normal cabin press is 8.6 +- 0.15 PSI Safety Relief opens at 9.6 psi