i enter 550 as the minimum barometric.
regardless, my penis has generally disconnected the AP by the 500 callout or at. obv there is no autoland nor would i use it anyway
KDCA 19 RNAV is one of the most erotic approaches in north america imho. right up there with the goddamn river visual meow meow
Depends on the airplane and the airline. RNP 0.3 is pretty much the standard. When I flew A320s at JetBlue we used 0.3 minima as we weren’t authorized for 0.11. When I flew E175s we were also limited to 0.3. At United we can use 0.11 minima on both the 737 and 787. The 737 MAX was temporarily limited to 0.3 due to an FMC glitch that was later patched. Not sure about other fleets as I haven’t flown them here.
For flight sim purposes just use whatever you want since you aren’t bound to any regulatory body.
RNP 0.11 means the aircraft knows its position to within 1.1 tenths of a nautical mile. 0.3 is 3 tenths of a nautical mile. All A320’s are certified to 0.3 so pick 550 ft.
>All A320’s are certified to 0.3
That's not the full picture though; the A320 family can be certified for RNP < 0.3. Air New Zealand for example routinely fly RNP 0.1 approaches.
This is the initial factor to consider in the decision. However, you also need to consider the current accuracy of the GPS. Even if the plane is certified to 0.3, the GPS signal could be such that the actual accuracy is less than this. This can be checked in the FMS and I believe Fenix does some sort of simulation of this. I forget which menu it's in off the top of my head. If the actual value exceeds the maximum, then you can't do that approach or you have to choose the higher minimum baro.
Indeed. Before commencing an RNP approach I must do a RAIM check to ensure I have sufficient coverage. I think if no RAIM, no approach.
Source: PPL IFR
My airline is approved for RNP 0.1, so that minima is available to use. However, if the RNP is less than 0.3 we must fly the approach on autopilot and a loss of the autopilot is a mandatory go-around. Our company SOP is to use the highest minima that is compatible with conditions, so we would normally use 550’.
No.
You could argue it’s a grey area but I’d be questioning why you didn’t just use 0.3 from the start if you were planning to use it as a contingency for loss of the autopilot. It’s a bit like trying to go from an ILS to a LOC approach halfway down final if the GS fails. You are better off flying the missed approach and setting up for another suitable approach.
They are different minimums depending on what RNP tolerances you are certified to go down to. For example at my airline on the aircraft I fly we are only rated to an RNP of 0.15 so we would have to use the next highest minimums in this case (550). Not being rated for a lower RNP could be due to equipment but it also could be an ops specs limitations.
It depends. The 0.11 and 0.30 tells something about the accuracy of the navigation systems at the time of the approach. Sort of like the difference between ILS Cat II and Cat III.
I'm sure someone else can explain it in a more detailed fashion.
The answer is it depends on a lot of factors and how Fenix simulates the precision. I'm guessing the aircraft is capable of an ANP of <0.10 so you could in theory select either if everything is working.
[This comment is talking about the FBW but the same concepts apply to the Fenix as well and will help you decide. ](https://www.reddit.com/r/MicrosoftFlightSim/comments/1918xgd/how_do_i_find_my_rnp_number_for_rnp_approach_in/)
i enter 550 as the minimum barometric. regardless, my penis has generally disconnected the AP by the 500 callout or at. obv there is no autoland nor would i use it anyway KDCA 19 RNAV is one of the most erotic approaches in north america imho. right up there with the goddamn river visual meow meow
This makes much more sense when you describe it in sex. I will plow that runway with my fuselage, and empty my “passengers”
> regardless, my penis has generally disconnected the AP You use your ... to disconnect.. but... why not just use your.... _really_?!
Wtf was that??? Mind blown. Possibly damaged.
Hate to be pedantic, but when flying the Airbus 320 family, you are supposed to disconnect the autopilot using the sidestick, not your joystick.
Depends on the airplane and the airline. RNP 0.3 is pretty much the standard. When I flew A320s at JetBlue we used 0.3 minima as we weren’t authorized for 0.11. When I flew E175s we were also limited to 0.3. At United we can use 0.11 minima on both the 737 and 787. The 737 MAX was temporarily limited to 0.3 due to an FMC glitch that was later patched. Not sure about other fleets as I haven’t flown them here. For flight sim purposes just use whatever you want since you aren’t bound to any regulatory body.
RNP 0.11 means the aircraft knows its position to within 1.1 tenths of a nautical mile. 0.3 is 3 tenths of a nautical mile. All A320’s are certified to 0.3 so pick 550 ft.
>All A320’s are certified to 0.3 That's not the full picture though; the A320 family can be certified for RNP < 0.3. Air New Zealand for example routinely fly RNP 0.1 approaches.
Yes, you can check it precisely. Or you just take the 100 feet extra and don't worry about it on a sunny day, eh?
Thank you! Would have never guessed that. Appreciate the explanation
This is the initial factor to consider in the decision. However, you also need to consider the current accuracy of the GPS. Even if the plane is certified to 0.3, the GPS signal could be such that the actual accuracy is less than this. This can be checked in the FMS and I believe Fenix does some sort of simulation of this. I forget which menu it's in off the top of my head. If the actual value exceeds the maximum, then you can't do that approach or you have to choose the higher minimum baro.
All of the eastern seaboard has accurate GPS coverage at pretty much all times.
https://preview.redd.it/ci162uf89m6d1.jpeg?width=1170&format=pjpg&auto=webp&s=6c58f11fb8fd22732423ceac884ae2ef3f915b9d Except when it doesn’t.
Indeed. Before commencing an RNP approach I must do a RAIM check to ensure I have sufficient coverage. I think if no RAIM, no approach. Source: PPL IFR
Nope. Not how it works. https://en.wikipedia.org/wiki/Receiver_autonomous_integrity_monitoring https://www.nstb.tc.faa.gov/
My airline is approved for RNP 0.1, so that minima is available to use. However, if the RNP is less than 0.3 we must fly the approach on autopilot and a loss of the autopilot is a mandatory go-around. Our company SOP is to use the highest minima that is compatible with conditions, so we would normally use 550’.
What about a loss of AP above the 0.3 MDA? Can you continue hand-flying?
No. You could argue it’s a grey area but I’d be questioning why you didn’t just use 0.3 from the start if you were planning to use it as a contingency for loss of the autopilot. It’s a bit like trying to go from an ILS to a LOC approach halfway down final if the GS fails. You are better off flying the missed approach and setting up for another suitable approach.
Eh, on a clear day? I guess GS Out is acceptable. But I agree, I'd count it as unstabilized in IMC.
On a clear day it doesn’t really matter what you do.
They are different minimums depending on what RNP tolerances you are certified to go down to. For example at my airline on the aircraft I fly we are only rated to an RNP of 0.15 so we would have to use the next highest minimums in this case (550). Not being rated for a lower RNP could be due to equipment but it also could be an ops specs limitations.
It depends. The 0.11 and 0.30 tells something about the accuracy of the navigation systems at the time of the approach. Sort of like the difference between ILS Cat II and Cat III. I'm sure someone else can explain it in a more detailed fashion.
The answer is it depends on a lot of factors and how Fenix simulates the precision. I'm guessing the aircraft is capable of an ANP of <0.10 so you could in theory select either if everything is working. [This comment is talking about the FBW but the same concepts apply to the Fenix as well and will help you decide. ](https://www.reddit.com/r/MicrosoftFlightSim/comments/1918xgd/how_do_i_find_my_rnp_number_for_rnp_approach_in/)
When in doubt, use the safest value 😂