LPV APPROACHS/ WASS

[RV-4]

Hello Listers

First : Happy Independance Day to all our US Friends

Second; Today I was looking at GPS/ LPV Approachs and notice that all of them have ( Jepps anyway ) in the upper left corner a square with the mention '' WASS, Ch *****, W-**A ' which I assume are for WASS/LPV approach, am I right on this ( never done a LPV approach yet )

Is this info required to be entered anywhere in your Wass GPS prior to doing the approach?

A friend with a GNS 480 in his Grumman would like to know.

Thank you for your imputs

Bruno
rv4@videotron.ca

[SmilingJack]

The channels auto tunes in our aircraft when the specific approach is entered into our FMS.

The W = WAAS
The number E.G. - 05 = Runway 5
The letter "A" = This is the first WAAS approach to runway 05

W-05A will show on our PFD when we are on the approach.

[RV-4]

Thanks John

I'll pass the info to my friend.

Bruno

[skylor]

Originally Posted by SmilingJack

The channels auto tunes in our aircraft when the specific approach is entered into our FMS.

The W = WAAS
The number E.G. - 05 = Runway 5
The letter "A" = This is the first WAAS approach to runway 05

W-05A will show on our PFD when we are on the approach.

With the Garmin 4XXW/5XXW, the WAAS channels auto tune and are not shown on the normal moving map displays. The need to know this information is essentially transparent to the end user.

Skylor
RV-8 N808SJ

[RV-4]

Thanks Skylor

He has a GNS 480 in his Grumman so it should be the same.

Thanks

Bruno

[Auburntsts]

Some FMS systems use the channel to select the approach. I seem to recall there's a section in the AIM about it. You can ignore it.

[RV-4]

Hi Todd

Well that's good to know.

Should be starting to do Lpv Approachs in the big bird soon so I should find out where to insert this number in the FMS.

Thanks

Bruno

[Ed_Wischmeyer]

With lotsa FMS, you select the approach and the channel never shows up. It's lots easier and more error resistant that way.

[Kevin Horton]

Some people many, many years ago envisioned the possibility of WAAS/LPV receivers for retrofit in ancient airliners. They proposed that it should be possible to have a control head that was the same size as some of the very small VOR/ILS control heads that some older aircraft have. The only interface would be a means to select the five digit approach channel using a double-stacked knob, similar to the way VOR or ILS frequencies are selected.

I was party to some preliminary discussions with one manufacturer that was working on a prototype for such a WAAS/LPV retrofit package, but I don't think they ever finished it. I believe they concluded the market was too small to justify the development cost.

[SmilingJack]

Originally Posted by Kevin Horton

Some people many, many years ago envisioned the possibility of WAAS/LPV receivers for retrofit in ancient airliners. They proposed that it should be possible to have a control head that was the same size as some of the very small VOR/ILS control heads that some older aircraft have. The only interface would be a means to select the five digit approach channel using a double-stacked knob, similar to the way VOR or ILS frequencies are selected.

I was party to some preliminary discussions with one manufacturer that was working on a prototype for such a WAAS/LPV retrofit package, but I don't think they ever finished it. I believe they concluded the market was too small to justify the development cost.

Ahh yes....I remember that. Thanks for making me feel old

I remember the company I worked for in 1989 purchased an S-76B and one of the options we put on it was an "MLS" system. It wasn't installed completely, but the primus (maybe Sperry back then) had a combination of buttons to get you into the screen. We would somehow get it in MLS mode and not be able to get it back out

I guess that was the precursor for LPV....???