Questions tagged [rnav]
Questions about RNAV, meaning Area Navigation, which allows aircraft to navigate between waypoints not marked by radio beacons on the ground.
45
questions
0
votes
0
answers
66
views
Why do they say PBN is under RNAV?
PBN exists under the umbrella of area navigation (RNAV).
[FAA AIM, Section 2. Performance-Based Navigation (PBN) and Area Navigation (RNAV)]
As far as I know, RNAV and RNP exist under PBN, and as an ...
- 121
0
votes
0
answers
29
views
What is the difference between RNAV-Terminal usage waypoints vs RNAV-STAR waypoints?
What is the difference between [MM604 (or) MM615] vs [RADAB (or) DAMAD] in the STAR attached below
When seen using Enroute Chart
The description for RADAB or DAMAD is:
The description for MM604 or ...
- 881
9
votes
1
answer
753
views
Should IFR flight plans in the USA still have one waypoint per sector in 2023?
Alternate title: How come ATC has cleared aircraft direct from Laredo to Columbus 17 times?
If you hop on ForeFlight today (Feb 20 2023) and search for suggested routes between KLRD and KCMH you'll ...
- 22.6k
7
votes
2
answers
486
views
Does RNAV and RNP specify what type of longitudinal accuracy the system has?
I understand RNAV 1 to mean it will be within 1 mile of the desired track 95% of the time, but that is lateral accuracy, what about longitudinal accuracy, in front and behind the estimated position ...
- 489
0
votes
0
answers
81
views
For point to point navigation on an unusable segment of a victor airway...?
For published unusable segments the FAA interpretation is that PIC should not file a flight plan including an unusable segment. If they do it may still be accepted by the system, so they should also ...
- 31
1
vote
0
answers
123
views
Along Track Distance ATD
ATD (Along-Track Distance) is used by ATC for certain types of (rare) NON-Radar Separation. I am training as an Air Traffic Controller in the USA. I have been told the only way to know if an aircraft ...
- 11
5
votes
2
answers
728
views
What is RNAV transition and what is the difference between RNAV transition and RNAV STAR
Can someone explain what is RNAV transition and what is the difference between RNAV transition and RNAV STAR. Because sometimes both types of procedures are published for an airport and I don't know ...
- 1,893
4
votes
1
answer
193
views
How do you calculate the deviation from an RNAV waypoint radial?
As a clarification at the beginning: I'm talking about non-GPS, pure VOR-DME based RNAV devices here.
On RNAV devices that use just the selected VOR-DME, not GPS, the phantom radio station is set up ...
- 1,158
5
votes
4
answers
266
views
How to monitor MSA sector from an RNAV waypoint in the 737?
For instance, at Manchester (EGCC) the approach procedure for RNP 23L has the MSA based off of RNAV waypoints; DOMIG bearing 142 to 322, OSNAP bearing 322 to 052, TINVA bearing 052 to 142.
From NATS ...
- 103
5
votes
1
answer
342
views
What does a DME indicator do in HOLD or RNAV mode?
I found this DME indicator on the Cessna 210. Its mode switch has four positions - NAV1, NAV2, RNAV and HOLD. NAV1 and 2 are clear - it uses the NAV1 and 2 freq respectively. I'm wondering what the ...
- 1,158
7
votes
1
answer
1k
views
What is the difference between a conventional and an RNAV holding?
While reading in the PANS-OPS (Doc 8168-OPS/611 Volume II) about holding procedures, I came across Chapter 7 of Part III section 3 defining RNAV holding procedures ...
- 6,940
3
votes
0
answers
536
views
Can I fly an RNAV DP (GPS & RNAV 1 required) with no FD/AP?
I’m currently planning an instrument flight which includes a full stop at an airport with a RNAV (Obstacle) Departure Procedure.
The procedure plate requires RNAV 1 and GPS.
In ground school I ...
- 31
9
votes
2
answers
3k
views
What should I do if I intercept the glideslope before reaching the final approach fix?
On several of the ILS and RNAV LPV approaches in my area (and notably the ones I expect for my checkride), I consistently intercept the GS at 0.1-0.2nm before the FAF.
An example: I am flying at ...
- 27.4k
3
votes
2
answers
1k
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 ...
7
votes
1
answer
277
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.
...
- 12.1k
4
votes
2
answers
300
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 ...
- 618
2
votes
3
answers
2k
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 ...
- 618
-3
votes
2
answers
257
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 ...
- 155
7
votes
2
answers
4k
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 ...
- 135
0
votes
0
answers
138
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?
- 9
3
votes
1
answer
1k
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 ...
- 8,681
5
votes
1
answer
2k
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 ...
- 6,503
2
votes
1
answer
453
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 ...
- 55.5k
6
votes
1
answer
776
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 ...
- 438
0
votes
1
answer
655
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 ...
- 1,833
2
votes
1
answer
637
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 ...
- 438
3
votes
1
answer
107
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?
- 133
2
votes
0
answers
35
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 ...
- 1,833
3
votes
4
answers
3k
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. ...
- 1,833
1
vote
1
answer
895
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 ...
- 33
0
votes
1
answer
60
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.
- 181
2
votes
1
answer
2k
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 ...
- 71
4
votes
1
answer
11k
views
What are RNP and ANP in area navigation?
What are Required Navigation Performance (RNP) and Actual Navigation Performance (ANP)?
2
votes
1
answer
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, ...
- 27.4k
5
votes
1
answer
902
views
What does "height loss" mean on an RNAV (RNP) approach plate?
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?
user29455
0
votes
1
answer
423
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 ...
- 26.3k
5
votes
3
answers
733
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 ...
- 27.4k
4
votes
3
answers
3k
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 ...
- 1,044
6
votes
1
answer
1k
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) ...
- 113
2
votes
1
answer
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 ...
- 306
9
votes
1
answer
1k
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) ...
- 151
5
votes
1
answer
549
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 ...
- 3,648
2
votes
1
answer
709
views
What is the reason to have LOC/VNAV landing method?
What is purpose of mixing LOC/VNAV in this landing method?
5
votes
2
answers
12k
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 ...
- 1,405
21
votes
7
answers
84k
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?
- 58.2k