GPS minimums

mooneyguy

mooneyguy

been around forever
I was just looking at an approach. An rnav into 5c1 runway 35. Under minimums it shows LNAV but above that it has LP which has 80' lower mins. I have searched everywhere and I cannot find LP. I've looked in the legend and in the instrument flying handbook and cannot find it. If someone could show me where to find it I would really appreciate it.
 
Chief Captain said:
Did they just forget the "v" in lpv?
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No, it stands for Localizer performance(only). So it's an lpv without vertical guidance. These would be more useful in places where a glideslope isn't possible while meeting terrain clearances. Like tons of step downs. Lpv is like an ILS but never to the same mins, so they are not as useful either. Lowest I've seen one is 300-1/2. I've heard rumor of another type of gps approach coming out that will give us down to like 600RVR if authorized.
 
z987k said:
No, it stands for Localizer performance(only). So it's an lpv without vertical guidance. These would be more useful in places where a glideslope isn't possible while meeting terrain clearances. Like tons of step downs. Lpv is like an ILS but never to the same mins, so they are not as useful either. Lowest I've seen one is 300-1/2. I've heard rumor of another type of gps approach coming out that will give us down to like 600RVR if authorized.
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I could imagine the FAA replacing LDAs or SDFs with LP, now that I think about it.
 
z987k said:
No, it stands for Localizer performance(only). So it's an lpv without vertical guidance. These would be more useful in places where a glideslope isn't possible while meeting terrain clearances. Like tons of step downs. Lpv is like an ILS but never to the same mins, so they are not as useful either. Lowest I've seen one is 300-1/2. I've heard rumor of another type of gps approach coming out that will give us down to like 600RVR if authorized.
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250-1/2 is pretty common on LPV approaches.
 
Thanks for the info. I expected that is what it was, but I was just having difficulty finding it in print.
 
z987k said:
No, it stands for Localizer performance(only). So it's an lpv without vertical guidance. These would be more useful in places where a glideslope isn't possible while meeting terrain clearances. Like tons of step downs. Lpv is like an ILS but never to the same mins, so they are not as useful either. Lowest I've seen one is 300-1/2. I've heard rumor of another type of gps approach coming out that will give us down to like 600RVR if authorized.
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Very interesting. Thanks. I just did some homework, and the info I found was pretty much as you posted.

A correction about lpv approaches though; they most certainly go below 250ft. As a rule of thumb, if the runway has an ILS and an RNAV approach, the LPV DH will be the same as the ILS DH.
 
mooneyguy said:
I was just looking at an approach. An rnav into 5c1 runway 35. Under minimums it shows LNAV but above that it has LP which has 80' lower mins. I have searched everywhere and I cannot find LP. I've looked in the legend and in the instrument flying handbook and cannot find it. If someone could show me where to find it I would really appreciate it.
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Z987K is correct. If you want to find actual writing about LP approaches you can find it in the AIM. Look at page 1-1-20 (b)(3). It is a new non-precision WAAS approach. As a CFI you should know to look in the AIM.
 
undflyboy06 said:
Z987K is correct. If you want to find actual writing about LP approaches you can find it in the AIM. Look at page 1-1-20 (b)(3). It is a new non-precision WAAS approach. As a CFI you should know to look in the AIM.
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Burn. Feel big now?

Interesting, haven't heard about LP approaches but it will be cool to see them start popping up at smaller airports.
 
undflyboy06 said:
Z987K is correct. If you want to find actual writing about LP approaches you can find it in the AIM. Look at page 1-1-20 (b)(3). It is a new non-precision WAAS approach. As a CFI you should know to look in the AIM.
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Ah yes the aim. Stupid me. That's what I get for not working as a cfi for a couple years. Hmm the things you forget. Which is why I'm trying to bring myself back up to speed before I start working with a student.
The aim was just one of those books you generally didn't pull out at fl370 for a bit of light reading.
 
Cessnaflyer said:
Interesting, haven't heard about LP approaches but it will be cool to see them start popping up at smaller airports.
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I had a jepp update I did maybe 8 months ago or something. I got the package and was like WTF is this?! There were probably 100 gps approach plates replaced because they now had LP mins added.
 
mooneyguy said:
Ah yes the aim. Stupid me. That's what I get for not working as a cfi for a couple years. Hmm the things you forget. Which is why I'm trying to bring myself back up to speed before I start working with a student.
The aim was just one of those books you generally didn't pull out at fl370 for a bit of light reading.
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The Aeronautical Information Manual is the most neglected manual in all of aviation, so don't feel bad about it. At all.

That said, it's also pretty damn hard to read, and while it can be interesting, most of it is thicker than...um...something thick, I'll think of something.
 
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