Black W
- Thread starter sr71
- Start date
Cessnaflyer
Wooooooooooooooooooooooooooooooo
WAAS
tgrayson
New Member
It's in the legend in the NACO book.
http://www.avn.faa.gov/content/naco/online/pdf_files/8th_IAP_Symbols.pdf
Bottom right of page 2. It does have to do with WAAS.
Related (possibly) question: what does the D in the airport diagram box on this approach plate signify?
http://204.108.4.16/d-tpp/1003/00610IL31L.PDF
Bottom right of page 2. It does have to do with WAAS.
Related (possibly) question: what does the D in the airport diagram box on this approach plate signify?
http://204.108.4.16/d-tpp/1003/00610IL31L.PDF
There is Declared Distance Information for the runways. Look it up in the airport in the A/FD for the particular airport. Whereas the small airport diagram itself just has the runway lengths, the DDI info in the A/FD gives you T/O Run Available, Accel/Stop Distance Avail, T/O Dist Avail, and Landing Distance Avail for the runways at that field. The runway length alone doesn't always tell these measured capabilities of the runway.
Interesting, thanks. I notice that HPN has the declared distance information in the A/FD (http://naco.faa.gov/pdfs/ne_191_11FEB2010.pdf), yet the D isn't in the airport box on the approach plate (http://204.108.4.16/d-tpp/1003/00651IL34.PDF). Inadvertent omission, or is there some other factor at work there?
deadstick
Well-Known Member
http://www.faa.gov/airports/resources/publications/orders/compliance_5190_6/media/5190_6b_appR.pdf
starting on p15
3. Purpose of Declared Distances:
a) To increase takeoff runway length at constrained airport sites while still
meeting design standards. (ex. increase runway takeoff length in one
direction while maintaining standard RSAs, ROFAs and RPZs.)
b) To enhance safety (improve RSAs, ROFAs, and RPZs) at constrained
airport sites. (ex. existing runway safety area does not meet standards,
but declared distances are used to effectively lengthen the runway
safety area beyond the stop end of the runway.)
....
e) Application of declared distance criteria may not be appropriate at
some GA airports, depending on the “design” aircraft (ARC). Pilots of
small GA aircraft do not have a requirement to use declared distances
to calculate allowable operating weights; therefore, use of declared
distances would not be appropriate at airports serving these aircraft
only. However, pilots of larger corporate or cargo aircraft do have a
requirement to use declared distances to calculate allowable operating
weights; therefore, declared distances would be appropriate at airports
serving these aircraft.
Dang...I bored....
Learn something new every day, or Friday night.
It's also discussed with respect to EMAS.
Looking at HPN, it has DDI, but the only real change from the airport diagram (on the plate) is the numerical value of the displaced threshold on 29. There is a "D" on the big airport diagram.
There isn't an approach to 29. Maybe that is why it's not on the plate. I dunno.
starting on p15
3. Purpose of Declared Distances:
a) To increase takeoff runway length at constrained airport sites while still
meeting design standards. (ex. increase runway takeoff length in one
direction while maintaining standard RSAs, ROFAs and RPZs.)
b) To enhance safety (improve RSAs, ROFAs, and RPZs) at constrained
airport sites. (ex. existing runway safety area does not meet standards,
but declared distances are used to effectively lengthen the runway
safety area beyond the stop end of the runway.)
....
e) Application of declared distance criteria may not be appropriate at
some GA airports, depending on the “design” aircraft (ARC). Pilots of
small GA aircraft do not have a requirement to use declared distances
to calculate allowable operating weights; therefore, use of declared
distances would not be appropriate at airports serving these aircraft
only. However, pilots of larger corporate or cargo aircraft do have a
requirement to use declared distances to calculate allowable operating
weights; therefore, declared distances would be appropriate at airports
serving these aircraft.
Dang...I bored....
Learn something new every day, or Friday night.
It's also discussed with respect to EMAS.
Looking at HPN, it has DDI, but the only real change from the airport diagram (on the plate) is the numerical value of the displaced threshold on 29. There is a "D" on the big airport diagram.
There isn't an approach to 29. Maybe that is why it's not on the plate. I dunno.
If there's a standalone (one page) airport diagram, the D will be on that. If there is none for that airport, it appears thats when you find it on the approach plate airport diagram box.
After some more investigation, it looks like you'll see the D on the big airport diagram regardless, and you'll see the D on the approach plate if there's a displaced threshold at the airport but the landing distance is not printed on the approach plate (on the mini airport diagram).
For instance, HPN and SWF both have runways with displaced thresholds. Both HPN and SWF have the D on their big airport diagram (HPN: http://204.108.4.16/d-tpp/1003/00651AD.PDF SWF: http://204.108.4.16/d-tpp/1003/00450AD.PDF). However, SWF does not print landing distances (for runways 9 and 27) on its mini airport diagrams, whereas HPN (for runway 29) does (HPN: http://204.108.4.16/d-tpp/1003/00651IL34.PDF SWF: http://204.108.4.16/d-tpp/1003/00450IL9.PDF). HPN's approach plates don't have a D on them, while SWF's do.
I also noticed, to my surprise, that BOS doesn't have declared distances in the A/FD.
And since I'm doing this sort of investigation on a Friday night, I think it can also be safely concluded that I need a girlfriend.
I don't believe all airports intended to have this information taken, have had it completed yet since this is relatively new.