fa2de3c9   
   XPost: rec.aviation.military   
      
   In article , miso@sushi.com says...   
   > On Apr 21, 7:05 pm,  wrote:   
   > > In article  > @x18g2000prb.googlegroups.com>, m...@sushi.com says...   
   > >   
   > >   
   > >   
   > > > The JEFX exercise running now at Nellis is supposed to have some sort   
   > > > of activity over Pahrump. This is the notam for the event.   
   > >   
   > > > A0984/10 - QRACA THERE IS A STATIONARY ALTRV IN THE PAHRUMP NEVADA   
   > > > AREA BOUNDED BY THE FOLLOWING   
   > > > POINTS: 3622N/11554W 3604N/11554W3604N/11612W 3630N/11630W 3630N/   
   > > > 11610W TO POINT   
   > > > OF ORIGIN. ACTIVE FROM 10000 TO 14000 WITH HIGH SPEED MILITARY   
   > > > AIRCRAFT. ALL   
   > > > NON PARTICIPATING TRAFFIC IS ADVISED TO AVOID THIS AREA. NOTE: THIS   
   > > > ALTRV EFFECTIVELY   
   > > > CLOSES V135 BETWEEN   
   > > > 10000 FT-14000 FT DURING THE ACTIVE TIME FRAME. SEE TEXT - SEE TEXT,   
   > > > 22 APR   
   > > > 19:00 2010 UNTIL 22 APR 22:00 2010. CREATED: 17 APR 19:22 2010   
   > >   
   > > > This translates to more or less:   
   > > > There is an altitude reservation in the Pahrump Nevada area bound by   
   > > > (coordinates) from 10000 to 14000 ft above ground level with high   
   > > > speed military aircraft. blah blah 22 April noon until 3PM PDT.   
   > >   
   > > > I'm told the ground staging is at the Calvada Air Park.   
   > >   
   > > I am not sure if that is a NOTAM or not but as a rule, I would be very   
   > > surprised if they gave an advisory to pilots that was in AGL and not   
   > > MSL.  Just about everything I am familiar with concerning altitudes for   
   > > aircraft is given in MSL as that is what the standard barometric   
   > > altimeter indicates.  Also it would drive the pilot crazy trying to   
   > > figure out AGL, particularly over uneven ground as it would be   
   > > constantly changing.     
   >    
   > That is a notam since I copied it from https://www.notams.jcs.mil.   
   >    
   > There is a transitional altitude where you change from AGL to MSL. If   
   > you are flying low, you want AGL since the maps have obstructions in   
   > AGL. After the transition altitude, you fly MSL so ATC can maintain   
   > vertical separation.  Also above the transition altitude, you fly at   
   > flight levels, not altitude per se. I'm not a pilot, but that is my   
   > understand of how they write the notams.   
   >    
   > There was a classic Blue Angels accident related to AGL versus MSL.   
   >    
      
   Actually I believe obstruction heights even on VFR sectional charts are    
   given in MSL.   They show the AGL heights in parenthesis for    
   informational purposes but the pilot is mainly interested in what the    
   height of the obstruction is in reference to what is altimeter is    
   indicating.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)