Questions tagged [rnav]

Questions about RNAV, meaning Area Navigation, which allows aircraft to navigate between waypoints not marked by radio beacons on the ground.

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2
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1answer
87 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
142 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
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1answer
50 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
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2answers
172 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
64 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
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0answers
29 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
524 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
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1answer
135 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
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1answer
46 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
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1answer
586 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
2k views

What are RNP and ANP in area navigation?

What are Required Navigation Performance (RNP) and Actual Navigation Performance (ANP)?
1
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1answer
733 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
328 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
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1answer
213 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
419 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
922 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
646 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
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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
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1answer
690 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
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1answer
344 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
444 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
5k 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 ...
19
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7answers
71k 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?