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#1
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Alternate Mimimums?
What exactly does the /A\na on approach plates mean. I know it says
Alternate minimums not authorized. Does it mean the airport can't be used as an alternate? thanks Steve |
#2
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It means that this airport cannot be used as an alternate for an IFR flight
plan. It can be used as the primary destination; however, it can not be used as an alternate. Keep in mind, alternate airports are only required in certain weather conditions. "smf" wrote in message news:F_hGb.22853$HQ.7869@okepread02... What exactly does the /A\na on approach plates mean. I know it says Alternate minimums not authorized. Does it mean the airport can't be used as an alternate? thanks Steve |
#3
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"KevinChandler" wrote in message ... It means that this airport cannot be used as an alternate for an IFR flight plan. It can be used as the primary destination; however, it can not be used as an alternate. Keep in mind, alternate airports are only required in certain weather conditions. It means it can't be the legally required alternate for filing a flight plan. An alternate is required when any of the following is true: 1. The weather forecast for the ETA +/- hour isn't going to be 2000' and 3 miles (1-2-3) rule. 2. The destination has no published approach. In addition to the alternate NA restrictions, the alternate must be served by an approach you are equipped for that does not involve GPS. Of course, all of this only applies to the legal requirements for filing a plan and computing the required fuel. Where you actually go if you can't get into your destination is unaffected by what you put down as an alternate. |
#4
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"Ron Natalie" wrote in message m... "KevinChandler" wrote in message ... It means that this airport cannot be used as an alternate for an IFR flight plan. It can be used as the primary destination; however, it can not be used as an alternate. Keep in mind, alternate airports are only required in certain weather conditions. It means it can't be the legally required alternate for filing a flight plan. An alternate is required when any of the following is true: 1. The weather forecast for the ETA +/- hour isn't going to be 2000' and 3 miles (1-2-3) rule. 2. The destination has no published approach. In addition to the alternate NA restrictions, the alternate must be served by an approach you are equipped for that does not involve GPS. Isn't the GPS rule only true if your primary destination used a GPS approach? Of course, all of this only applies to the legal requirements for filing a plan and computing the required fuel. Where you actually go if you can't get into your destination is unaffected by what you put down as an alternate. |
#5
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In article , "KevinChandler"
writes: It means that this airport cannot be used as an alternate for an IFR flight plan. It can be used as the primary destination; however, it can not be used as an alternate. Keep in mind, alternate airports are only required in certain weather conditions. Or if you are filing to an airport without an approach. Chuck |
#6
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"smf" wrote
What exactly does the /A\na on approach plates mean. I know it says Alternate minimums not authorized. Does it mean the airport can't be used as an alternate? Not quite. It means that approach can't be used in determining alternate minima for that airport. There are three kinds of alternate minima (see 91.169c): For a precision approach, 600-2 unless otherwise noted For a non-precision approach, 800-2 unless otherwise noted If no approach exists, weather conditions that allow descent from the MEA, approach, and landing under basic VFR. Under these rules, ANY airport (even one with no published approaches) can be used as an alternate if the weather is good enough, and the determination of how good the weather has to be (alternate minima for the airport) is made based on what approaches are available. The /A\na means that the specified approach is not to be used as a factor in the determination. It doesn't mean the airport can't be used as an alternate - other approaches at the same airport may not have the same restriction, and in any case even if all approaches are so restricted the airport can still be used as an alternate if the weather is good enough. I have actually seen one airport served by half a dozen approaches, including an ILS, where all the approaches were noted /A\na except one NDB approach. This means that rather than using the typical minima for an ILS-equipped airport (600-2) the more restrictive non-precision minima (800-2) must be used. Note that this does not preclude the use of the ILS approach to get into the airport should you need to go there. Michael |
#7
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#8
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On Wed, 24 Dec 2003 10:24:31 -0800, "Tarver Engineering"
wrote: Isn't the GPS rule only true if your primary destination used a GPS approach? GPS can't be used for an alternate regardless of the type of approach at the primary. |
#9
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Roy Smith wrote
I have actually seen one airport served by half a dozen approaches, including an ILS, where all the approaches were noted /A\na except one NDB approach. Any idea why? My understanding was that an approach got the /A\ thingie if the navaids required to fly it were not monitored. That sort of makes sense - the NDB probably had remote monitoring because it was part of an airway once, long ago. I think the last of the NDB airways in the US were decomissioned a couple years ago, though. If you look up the alternate mins for KCLL (College Station, TX) you will see that the ILS and LOC BC go NA when the tower closes, but the VOR approach doesn't. I suspect this is because CLL VORTAC must be remotely monitored because it forms the basis of multiple STAR's serving Houston and Dallas, whereas the ILS transmitter is probably only monitored in the tower cab. Michael |
#10
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Michael wrote:
Roy Smith wrote I have actually seen one airport served by half a dozen approaches, including an ILS, where all the approaches were noted /A\na except one NDB approach. Any idea why? My understanding was that an approach got the /A\ thingie if the navaids required to fly it were not monitored. That sort of makes sense - the NDB probably had remote monitoring because it was part of an airway once, long ago. I think the last of the NDB airways in the US were decomissioned a couple years ago, though. /snip/ Not sure about the Lower 48, but there are still plenty of Low Frequency airways in Alaska. In fact, quite a few of our NDB's have DME associated with them. Anyone know of any colored airways in the ConUS? Happy Flying! Scott Skylane |
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