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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3
votes
2answers
134 views

Vector to final on RNAV approach with the Intermediate and final segments are not aligned

Consider the RNAV 30 approach to C83 (Byron, CA), On a recent training flight requesting vectors for the approach, ATC pointed us to the MOVDD IF before cutting us loose (informing us that we would ...
6
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1answer
128 views

Why would there be two RNAV waypoints co-located with a VOR?

Similar to this question but more so! The Enroute H-5 chart shows two RNAV waypoints over Spinner VORTAC (SPI): SOHOW and USIRE. Neither waypoint appears on the Low IFR charts, nor on the VFR charts. ...
4
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2answers
128 views

Are VOR airways being replaced by RNAV routes as VORs are decommissioned?

I understand that VORs in the US and elsewhere are being removed from service gradually. The FAA plans to maintain a Minimum Operational Network, but still I imagine many VOR airways will also have to ...
2
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3answers
357 views

Is it legal to use GPS to navigate VOR Airways?

A previous question concludes that it is legal to fly an aircraft in the US with only an IFR-approved GPS/WAAS system and no other navigation equipment on an IFR flight plan. My question is about how ...
-3
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2answers
103 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
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2answers
821 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
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0answers
88 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?
3
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1answer
140 views

How does CDI scaling transition from terminal to approach sensitivity?

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
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1answer
697 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
248 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 ...
6
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1answer
533 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
247 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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1answer
506 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
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1answer
82 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
32 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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4answers
2k 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
419 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
52 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
1k 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
6k views

What are RNP and ANP in area navigation?

What are Required Navigation Performance (RNP) and Actual Navigation Performance (ANP)?
1
vote
1answer
3k 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
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1answer
568 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
307 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 ...
5
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3answers
591 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 ...
3
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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
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1answer
903 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
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
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1answer
989 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
428 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
554 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
9k 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
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7answers
80k 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?