RNP and ANP
Thread Starter
Joined: Aug 2010
Posts: 79
Likes: 0
From: between FL0-350
RNP and ANP
Greetings guys!
This is the ND of Boeing 737-800
http://flightlevel350.tumblr.com/image/29556344615
Bottom Arrow:
Could anybody tell me what is RNP and ANP - Required/Actual Navigational Performance exactly? and how it can be used in an approach? or do you use during cruise, etc?
Top Arrow:
what is TRNB 0152.4z ?
many thanks in advance!
This is the ND of Boeing 737-800
http://flightlevel350.tumblr.com/image/29556344615
Bottom Arrow:
Could anybody tell me what is RNP and ANP - Required/Actual Navigational Performance exactly? and how it can be used in an approach? or do you use during cruise, etc?
Top Arrow:
what is TRNB 0152.4z ?
many thanks in advance!
Joined: Mar 2001
Posts: 4,562
Likes: 33
From: I wouldn't know.
Obviously a flightsim question, please mark that next time in the title.
Anyway, RNP is the Required Navigation Performance for the current environment, ANP is the Actual Navigation Performance.
TRNB is the next waypoint and the time the aircraft arrives at that waypoint is 0152.4z.
Anyway, RNP is the Required Navigation Performance for the current environment, ANP is the Actual Navigation Performance.
TRNB is the next waypoint and the time the aircraft arrives at that waypoint is 0152.4z.
Joined: Apr 2009
Posts: 816
Likes: 0
From: UK
4 letter identifiers are normally ICAO airport codes, with TR being the prefix for Montserrat. However there doesn't seem to be a TRNB and it would be unusual (but quite possible) to be navigating directly to an airfield reference point. TRNB could be a user created waypoint or may just be random letters to demonstrate elements of the display.
Joined: Mar 2011
Posts: 1,407
Likes: 0
From: engineer at large
Check this site. It appears the ARINC coding is incorrect, at UKBB/KPB, the mistake is that the TR NDB is coded as IF, not a TF leg.
Here is a low cost explanation of RNP and ANP....
from 737.org
Actual Navigation Performance (ANP) is the FMC's estimate of the quality of its position determination. The FMC is 95% certain the the aircraft's actual position lies within a circle of radius ANP centred on the FMC position. Therefore the lower the ANP, the more confident the FMC is of its position estimate.
Required Navigation Performance (RNP) is the desired limit of navigational accuracy and is specified by the kind of airspace you are in. Eg for BRNAV above FL150, RNP=2.00nm. The RNP may be overwritten by crew.
ACTUAL should always be less than RNP.
Here is a low cost explanation of RNP and ANP....
from 737.org
Actual Navigation Performance (ANP) is the FMC's estimate of the quality of its position determination. The FMC is 95% certain the the aircraft's actual position lies within a circle of radius ANP centred on the FMC position. Therefore the lower the ANP, the more confident the FMC is of its position estimate.
Required Navigation Performance (RNP) is the desired limit of navigational accuracy and is specified by the kind of airspace you are in. Eg for BRNAV above FL150, RNP=2.00nm. The RNP may be overwritten by crew.
ACTUAL should always be less than RNP.
Last edited by FlightPathOBN; 17th August 2012 at 18:18.
Joined: Aug 2006
Posts: 638
Likes: 0
From: South
Actual Navigation Performance (ANP) is the FMC's estimate of the quality of its position determination. The FMC is 95% certain the the aircraft's actual position lies within a circle of radius ANP centred on the FMC position. Therefore the lower the ANP, the more confident the FMC is of its position estimate.
The FMC is neither more or less confident, it is just the size of the uncertainty that changes.
Thread Starter
Joined: Aug 2010
Posts: 79
Likes: 0
From: between FL0-350
Thanks a lot for the information. 737.org helped a lot, so are all replies above!
To tell you bit of extra info about this, I was flying a simulator session from VCBI to VOTR and an ILS approach to RWY 27 @ VOTR. I had to do a Go Around so I made a TOGA and suddenly TRNB 0152.4z appeared in the ND confusing me.
I am studying B1, but trying to get the whole concept of flying so I could understand more things when the aircraft is flying as now I spend more time with the aircraft when it is on ground
Thanks to all!
To tell you bit of extra info about this, I was flying a simulator session from VCBI to VOTR and an ILS approach to RWY 27 @ VOTR. I had to do a Go Around so I made a TOGA and suddenly TRNB 0152.4z appeared in the ND confusing me.
I am studying B1, but trying to get the whole concept of flying so I could understand more things when the aircraft is flying as now I spend more time with the aircraft when it is on ground
Thanks to all!
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
Originally Posted by Pub User
It could be the older Boeing system of using 'NB' after the name of an NDB. Is there a 'TR' NDB in your database?
Code0 - here is your NDB at VOTR..
http://www.google.co.uk/url?sa=t&rct...maBP6kcHgDO-uQ
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
My pleasure - just had to stop this 'wandering around the houses' we have been watching
Quite how we finished up in UKBB at an IF or Montserrat defeats me. I found at least 6 TR NDBs worldwide.
If you look up VOTR in the India AIP you will see the hold at TR. The g/a off 27 goes right to the TR to hold.
Quite how we finished up in UKBB at an IF or Montserrat defeats me. I found at least 6 TR NDBs worldwide.If you look up VOTR in the India AIP you will see the hold at TR. The g/a off 27 goes right to the TR to hold.
Joined: Mar 2011
Posts: 1,407
Likes: 0
From: engineer at large
The same question was posted on another Sim site...there is a TR NDB there as well, that was coded in the SIM database as an IF not TF leg, and it made sense with the image shown...
thats how!
thats how!
Last edited by FlightPathOBN; 19th August 2012 at 00:43.
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
code0 - if you look at the link I gave you will/?should? clearly see 'TR' is the ident.
I feel this thread should be in 'Spectators Balcony' We have no idea what level of piloting knowledge your 'B1' licence give you and I feel we are wasting our time here with someone who cannot use a search engine.
Exactly WHAT is your level of piloting knowledge?
I feel this thread should be in 'Spectators Balcony'
We have no idea what level of piloting knowledge your 'B1' licence give you and I feel we are wasting our time here with someone who cannot use a search engine.Exactly WHAT is your level of piloting knowledge?
Joined: Apr 2009
Posts: 816
Likes: 0
From: UK
If ever you were an instructor BOAC, I presume you would have specialised in the 'I can do it so why can't you' instructional technique. Whatever happened to sharing knowledge with encouragement and good grace. If you really feel that as you said, you are wasting your time, perhaps you shouldn't bother answering people's questions at all. Incidentally, that format for an NDB is certainly not common to all Boeing FMCs.
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
Likes: 4
From: UK
You mean like up to post #17 when I realised what we were dealing with.? Doh! You would have been chopped.
You probably did not notice, either, but the last question was "Just a small question what is a TR NDB ? and TR VOR? . . . is it a special kind ?"
Can you work that out for yourself or do you need help?
You probably did not notice, either, but the last question was "Just a small question what is a TR NDB ? and TR VOR? . . . is it a special kind ?"
Can you work that out for yourself or do you need help?
, so perhaps a little friendly elucidation of information is no bad thing.