Questions tagged [rnav]
Questions about RNAV, meaning Area Navigation, which allows aircraft to navigate between waypoints not marked by radio beacons on the ground.
28
questions
-3
votes
2answers
78 views
What is the purpose of aircraft localization? [closed]
I want to understand what is the purpose of doing localization while an aircraft is flying? What sensors are used by the instruments that do this localization of an aircraft? Is there more than one ...
5
votes
1answer
152 views
Why RNAV SIDs and STARs are RNAV 1 instead of RNP 1?
I am studying for my CFII check-ride and I was wondering to know why SIDs and STARs are not RNP 1 but RNAV 1?
Let's start with the following two definitions
RNP - Required Navigation Performance: It's ...
0
votes
0answers
72 views
What is P-RNAV?
I came across the term P-RNAV.
What is P RNAV, and what are the differences from 'standard' Area Navigation(RNAV)? Is there a specific set of requirements for P RNAV?
1
vote
0answers
38 views
How does WAAS CDI scaling transition during an LPV approach?
I read in the AIM that WAAS vector modes will provide a linear course width of +/-1NM prior to the FAF and then provide a fixed width of +/-0.3NM to the point where an ILS splay would be 0.3NM and ...
5
votes
1answer
433 views
What is GPS HIL in layman's terms?
GNSS Horizontal Integrity Limit/ Horizontal Protection Level is a measure of GNSS position error/integrity that's very important in RNP operations and RAIM, but it has an obtuse definition in aviation ...
2
votes
1answer
185 views
Does EASA allow using a portable GPS for RNAV capability?
Assume an older IFR-certified aircraft with the classical equipment, that is two VOR/ILS receivers with plain CDIs, ADF and DME, but no GPS. It can be flown IFR, but many routes can't be used, because ...
5
votes
1answer
407 views
What is the lowest RNP approach requirement without being RNP AR?
I was recently told by a friend that as soon as RNP for an approach is below the 1.0/0.3nm standard that it is required to be RNP AR.
At least here in Australia, a curved segment anywhere on the ...
0
votes
1answer
170 views
Does the term track guidance apply only to conventional procedures?
In ICAO's 8160 "Aircraft Operations" manual there is a term called "track guidance", for which I can not find any clear definition.
A few examples:
Departure Procedures 3.1
3.1.1 There are ...
1
vote
2answers
397 views
What are the ICAO GNSS waypoint naming conventions?
I'm curious about ICAO naming conventions regarding GNSS and RNAV waypoints. Would I be correct in assuming that all GNSS area waypoints are 5 letters, and RNAV waypoints are 6?
What about waypoints ...
3
votes
1answer
76 views
Are rhumb lines ever used as leg paths for RNP/RNAV?
Are rhumb lines ever used by an FMS as leg paths for RNP/RNAV? If so, what arinc 424 leg type would use them?
2
votes
0answers
31 views
Does a Navigation Specification characterize all legs of a terminal procedure?
I am studying the different parts of Instrument Flight Procedures, as they are described by FAA's manuals, such as the Aeronautical Information Manual, TERPS and Performance Based Navigation. For ...
3
votes
2answers
1k views
Why are there no RNAV (ILS) approaches?
While studying the PBN (FAA Order 8260.58A) and TERPS (FAA order 8260.3D) documents, I still have some trouble figuring part of the logic behind the naming and definitions of the published IAP Charts. ...
0
votes
1answer
293 views
What does mean 'GS' in RNAV (GPS) Chart?
Hello.
I have a question about 'GS' in my RNAV(GPS) Approach Chart.
Usually, (Including PAPI, VASI whatever...) Normal Glide Descent Angle means 3.00 degree.
but some 'GS' says 3.07, 3.04, 3.09 ...
0
votes
1answer
51 views
Has mod percent changed for Mark-1 glide slopes?
Mark-1F glide slopes operate at 80 percent modulation. What was it for earlier versions i. e. Mark-1C, Mark-1D, etc.
2
votes
1answer
954 views
confusion between RNAV and RNP approaches and specifiations [duplicate]
Ive been really confused between these two specifications recently. For example my research suggested that RNP has on board monitoring and alerting and RNAV doesn't require this, however then why must ...
3
votes
1answer
5k views
What are RNP and ANP in area navigation?
What are Required Navigation Performance (RNP) and Actual Navigation Performance (ANP)?
1
vote
1answer
2k views
Does ATC prefer ILS over RNAV?
Listening to APP for several major (US class B) airports, it seems that every flight is vectored to intercept the localizer. Is it really possible that 100% of flights filed an ILS approach? If so, ...
4
votes
1answer
496 views
RNAV (RNP) Approach Height Loss Question?
While viewing the following approach chart, which is an RNAV(RNP) CAT C Approach, there are several landing minima, stating a HEIGHT LOSS OF 50' AND 150', what does that specifically mean?
0
votes
1answer
273 views
Substitute Suitable RNAV system for Inop Radar on approach “requiring” Radar
Assuming my aircraft's navigation equipment is a "Qualified/Suitable RNAV System," as defined by AC 90-108, is it legal for me to fly the LDA Y Rwy 19 IAP to DCA with ATC Radar out of service?
Here ...
4
votes
2answers
492 views
Why do RNAV airways exist?
I assume there's some stupidly obvious reason that I'm missing, but why bother creating RNAV airways when I thought the entire point of RNAV was not needing to fly along a suboptimal preset path?
I ...
2
votes
3answers
2k views
What are the “parts” of a SID procedure?
In the ARINC 424 (downloadable from this link), the following information about SIDs procedures is given in the section 5.7 Route Type (RT TYPE):
As you can see, it appears to me that a procedure is ...
6
votes
1answer
784 views
What sensors are required to fly RNAV 5 airways?
In the example shown above:
Is an aircraft required to have all 3 sensors listed or just one of them to fly the L512 airway? What ICAO reference confirms the answer?
Does 'critical DME' (bottom row) ...
2
votes
1answer
2k views
How do I fill the PBN\ part in a Flight Plan Form?
Flight Plan Form Section 10 is the "Equipment" section, where one input whatever navigation or communication equipment on board. In addition, Section 18 is the "Other information" section, where you ...
9
votes
1answer
844 views
When should I start turning in this circling approach?
I've been practicing circling approaches in Homestead General Aviation Airport in Homestead, Florida (X51). I performed the RNAV (GPS) RWY 10 approach with circling minimums.
My questions are:
a) ...
5
votes
1answer
395 views
Why is there a GPS/RNAV waypoint co-located with a VOR?
There is an RNAV waypoint named STYCK co-located at what appears to be the exact location of the LOA VOR (coordinates match precisely as well). Why would the creation of a waypoint be necessary if IFR ...
2
votes
1answer
518 views
What is the reason to have LOC/VNAV landing method?
What is purpose of mixing LOC/VNAV in this landing method?
5
votes
2answers
8k views
Must RAIM be checked in flight before every GPS approach or is a preflight check acceptable?
My instructor has been teaching me to run a RAIM check for each RNAV approach we do. For some flights this can be 4 or more RAIM checks for the various airports/approaches and adds significantly to ...
21
votes
7answers
78k views
What is the difference between LNAV/VNAV and LPV minimums on an RNAV approach?
This approach shows two sets of minimums that both have vertical guidance with a Decision Altitude (DA). What is the difference between LNAV/VNAV and LPV, and why does LPV have lower minimums?
