Instrument Flying

[Marauder]

Based on how refreshing Audipilot's thread on the ILS/LOC was (much better than talking about LOP, CamGuard and take-off flap positions), I thought I would start a general thread on instrument flying. Although I have been instrument rated for 21 years, RNAV is still relatively new to me and I am still learning the finer details of GPS approaches.

So let me start with an easy one... I flew out to Gettysburg PA for a pancake breakfast and was surprised to find that the GPS approach was a circle to land only. I thought since GPS waypoints could be placed anywhere, why would they not have created at least a straight-in approach for the primary (wind favored) runway?

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[Mooneymite]

I have no knowledge of this particular airport/approach, but generally it has to do with obstructions preventing a "normal" final approach segment.

 

For example, looking at the terrain around Carson City, you can easily see why there's no straight in to RWY 9, but there is to RWY 27.

 

http://155.178.201.160/d-tpp/1406/06515RA.PDF

[Ned Gravel]

It may be that the surrounding terrain does not meet the criteria for an approach down the centreline of either runway.  I have a friend at our flying club who designs these for a living, and while we would love to have a GPS approach to Rockcliffe (CYRO), he tells me that the Canadian Museum of Aviation buildings are too close to the south edge of the runway and the trees on the approach to 27 are too close to the threshold (it is already displaced some 1000' for night landings).

[N601RX]

It might be a good idea to ask Craig to start a new forum for instrument related stuff. That would make it easier for others to find later on.

[ArtVandelay]

If you go back, select map, and turn on topography, you will see the mountain range and prevents a normal approach

[Marauder]

I have no knowledge of this particular airport/approach, but generally it has to do with obstructions preventing a "normal" final approach segment.

For example, looking at the terrain around Carson City, you can easily see why there's no straight in to RWY 9, but there is to RWY 27.

http://155.178.201.160/d-tpp/1406/06515RA.PDF

There was a ridge a mile or so west of the airport. Maybe that was it. I also understand why they wouldn't have created a RWY6 approach -- you would fly over Obama's barbecue at Camp David.

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[1964-M20E]

It could be to avoid traffic patterns and approaches for surrounding airports.

[yvesg]

The IFR plates format is changing in Canada. Here is the new version for one of the approaches at my home field. What do you think about it?

Yves

[John Pleisse]

All Terps criteria...thanks for making me bone-up, Chris.

 

 

http://www.skybrary.aero/bookshelf/books/1430.PDF

[chrisk]

The IFR plates format is changing in Canada. Here is the new version for one of the approaches at my home field. What do you think about it?

Yvesimage.jpg

I prefer the graphical missed approach diagram on the US plates.

[BorealOne]

It may be that the surrounding terrain does not meet the criteria for an approach down the centreline of either runway... the Canadian Museum of Aviation buildings are too close to the south edge of the runway and the trees on the approach to 27 are too close to the threshold (it is already displaced some 1000' for night landings).

Not to mention the CYR over Rideau Hall and the Parliament Blgs.

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[Marauder]

Not to mention the CYR over Rideau Hall and the Parliament Blgs.

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Eh? What are CYRs? Sounds like a change in the proooocess.

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[DrBill]

CYRs = Canadian Restricted Areas.  Similar to our Restricted areas over critical areas (state capitols, etc).

BILL

[Marauder]

CYRs = Canadian Restricted Areas. Similar to our Restricted areas over critical areas (state capitols, etc).

BILL

AHBOUT time some responded. Thanks Bill.

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[chrisk]

Based on how refreshing Audipilot's thread on the ILS/LOC was (much better than talking about LOP, CamGuard and take-off flap positions), I thought I would start a general thread on instrument flying. Although I have been instrument rated for 21 years, RNAV is still relatively new to me and I am still learning the finer details of GPS approaches.

So let me start with an easy one... I flew out to Gettysburg PA for a pancake breakfast and was surprised to find that the GPS approach was a circle to land only. I thought since GPS waypoints could be placed anywhere, why would they not have created at least a straight-in approach for the primary (wind favored) runway?

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 I would guess that this is due to the near by  R4009 and P40 areas.   A missed approach or final approach would likely enter these areas.  Of course, it could be they just overlaid it on an old NDB approach?

[Marauder]

I would guess that this is due to the near by R4009 and P40 areas. A missed approach or final approach would likely enter these areas. Of course, it could be they just overlaid it on an old NDB approach?

It may be that simple. I don't think the terrain (hills) should be playing a role but do wonder what the TERPS requirement is for the runway is. There is a displaced threshold and wonder if that may be playing a role on the 24 side. Runway 6 would definitely be in the prohibited area during an approach.

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