How do YOU determine Vis at the minima?
Join Date: Jan 2005
Location: At home
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
I must have missed reading the counting the lead in lights......what kind of bumfh is that?..ummm. 1 2 3 4..ishh....
You break visual..or emerge from the "industrial haze"...and hey presto you have the calverts there..or you dont...(or you glimpse a nice tempting threshold light)
Incidentally...I once saw a fender bender on the A30..just as we emerged out of the gloop CAT II, landing on 27L at Heathrow..as pilot not flying. (THE A30..is a road that runs past the 27L threshold)....
Initially I confused all the brake lights as obstacle lights!
You break visual..or emerge from the "industrial haze"...and hey presto you have the calverts there..or you dont...(or you glimpse a nice tempting threshold light)
Incidentally...I once saw a fender bender on the A30..just as we emerged out of the gloop CAT II, landing on 27L at Heathrow..as pilot not flying. (THE A30..is a road that runs past the 27L threshold)....
Initially I confused all the brake lights as obstacle lights!
PPRuNeaholic
Join Date: Jun 2000
Location: Cairns FNQ
Posts: 3,255
Likes: 0
Received 0 Likes
on
0 Posts
Thanks slice. Having been involved in determining visibility minima from that document (and its predecessors! 
) over the past too many years, I'd love to read a rationale for it all! 
) over the past too many years, I'd love to read a rationale for it all!
Join Date: Dec 2000
Location: Sydney NSW Australia
Posts: 3,051
Likes: 0
Received 0 Likes
on
0 Posts
Grandpa Aerotart
Counting lights is a low vis departure situation not a minima for landing thing.
You have an idea what you should be able to see before commencing the approach...something associated with the approach end of the runway...and when you look up you either can see it or can't...be that HIALS, threshold lights etc in the case of a precision approach or in the case of a NPA can you see the runway?
Certainly a circling approach complicates things a little but not that much. Look at the Meeka VOR RWY 09 for example...circling to land requires a minima of (Cat B) 600'/2.4km vis. The aid (MAPt) looks to be several hundred meters NW of the 09 threshold on the 13-1 aerodrome diagram and the runway is 7155' long. The runway is 2.1km long...if you can't see the far end you most assuredly don't have 2.4km vis.
All the info you need to make this decision is in your IAL charts...but you need to look at more than the approach chart minima.
The above calc took all of 1 minutes look at the aerodrome diagram....it's called planing your arrival.
Chuck.
You have an idea what you should be able to see before commencing the approach...something associated with the approach end of the runway...and when you look up you either can see it or can't...be that HIALS, threshold lights etc in the case of a precision approach or in the case of a NPA can you see the runway?
Certainly a circling approach complicates things a little but not that much. Look at the Meeka VOR RWY 09 for example...circling to land requires a minima of (Cat B) 600'/2.4km vis. The aid (MAPt) looks to be several hundred meters NW of the 09 threshold on the 13-1 aerodrome diagram and the runway is 7155' long. The runway is 2.1km long...if you can't see the far end you most assuredly don't have 2.4km vis.
All the info you need to make this decision is in your IAL charts...but you need to look at more than the approach chart minima.
The above calc took all of 1 minutes look at the aerodrome diagram....it's called planing your arrival.
Chuck.
Join Date: Dec 2000
Location: Sydney NSW Australia
Posts: 3,051
Likes: 0
Received 0 Likes
on
0 Posts
hmmmm codecs might be needed.
i have a codec pack i will try to upload to my webspace for all to use.
it plays as a Divx on windows media player.
you need all the files here! no viruses.
download all files except Index.php, into a folder. the index file just allows the page containing the files to open.
hopefully this will provide all the codecs you will ever need. if it doesnt work i will try to find another source for them.
i have a codec pack i will try to upload to my webspace for all to use.
it plays as a Divx on windows media player.
you need all the files here! no viruses.
download all files except Index.php, into a folder. the index file just allows the page containing the files to open.
hopefully this will provide all the codecs you will ever need. if it doesnt work i will try to find another source for them.
Last edited by Ultralights; 16th Feb 2005 at 08:46.
