Questions tagged [rnav]
Questions about RNAV, meaning Area Navigation, which allows aircraft to navigate between waypoints not marked by radio beacons on the ground.
26
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52 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?
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0answers
22 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
166 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
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1answer
121 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 ...
4
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1answer
259 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 ...
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1answer
72 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
257 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 ...
2
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1answer
68 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?
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0answers
30 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
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2answers
814 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. ...
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1answer
183 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 ...
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1answer
47 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.
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1answer
782 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
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1answer
3k views
What are RNP and ANP in area navigation?
What are Required Navigation Performance (RNP) and Actual Navigation Performance (ANP)?
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1answer
1k 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, ...
3
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1answer
392 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?
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1answer
242 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
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2answers
456 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
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3answers
1k 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
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1answer
690 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
1k 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
754 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
364 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
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1answer
471 views
What is the reason to have LOC/VNAV landing method?
What is purpose of mixing LOC/VNAV in this landing method?
5
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2answers
6k 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 ...
20
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7answers
74k 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?
