Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Runway Bearing Strength.  
User currently offlineSIDsandSTARs From United Kingdom, joined Oct 2002, 7 posts, RR: 0
Posted (10 years 7 months 2 weeks 1 day 7 hours ago) and read 14292 times:

Rather a technical question here I'm afraid, but I wonder if any of you guys know the answer?

Quote from the http://www.boeing.com/assocproducts/aircompat/acaps/7772sec7.pdf

"The ACN/PCN system (Section 7.9) as referenced in ICAO Annex 14, "Aerodromes," First Edition, July 1990, provides a standardized international airplane/pavement rating system replacing the various S, T, TT, LCN, AUW, ISWL, etc., rating systems used throughout the world."

The ACN/PCN may have replace the older systems in ICAO's eyes but they're still alive and well in some parts of the world.

I'm familiar with the ACN/PCN system, the LCG system, and to some extent the LCN system.

But I'm really confused where an airfield still just lists Maximum AUW (all up weight in x1000Kgs) dependant upon type of undercarriage assembly. (This applies most of the airfields in the USA)

The only reference I have decodes the following codes:

S = Single Wheel
T = Twin Wheel
B = Bogie
DB = Double Bogie

But I'm coming across codes such as AUW100S/190D/360DT/550TRT/850DDT

Can anyone decode the following for me?

DT
ST
TT
TDT
DDT
DDB
TRT

Rgds SIDsandSTARs

p.s. which of the codes above would a B777-200 come under?

7 replies: All unread, jump to last
 
User currently offlineTiger119 From United States of America, joined Sep 2003, 1919 posts, RR: 0
Reply 1, posted (10 years 7 months 2 weeks 1 day 6 hours ago) and read 14243 times:

I am relatively sure DDT is Dual Double Tandem. If you look at different airports on http://www.airnav.com you will see runway weight limits on some airports. Look at LAX for example: http://www.airnav.com/airport/KLAX runway 7L/25R weight limitation for Dual Double Tandem is 900,000 pounds.


Flying is the second greatest thrill known to mankind, landing is the first!
User currently offlineSIDsandSTARs From United Kingdom, joined Oct 2002, 7 posts, RR: 0
Reply 2, posted (10 years 7 months 2 weeks 1 day 3 hours ago) and read 14156 times:

Thanks Tiger  Smile

The example I used was for Rwy 07/25 at Rockford (KRFD)

100S/190D/360DT/550TRT/850DDT (Aerad Western Hemisphere Supplement)

http://www.airnav.com/airport/KRFD (Thanks for the link) Shows

Single wheel: 100000 lbs
Double wheel: 190000 lbs
Double tandem: 360000 lbs
Dual double tandem: 850000 lbs

So It looks like your correct with DDT, interesting to note despite Aerad stating that the figures are in Kgs, it looks like there' actually in x1000 pounds here  Wow!

Where as Baltimore (KBWI) 10/28 is list as

45S/100D/227DT/385DDT (Aerad Western Hemisphere Supplement)

Against

http://www.airnav.com/airport/KBWI

Single wheel: 100000 lbs
Double wheel: 220000 lbs
Double tandem: 500000 lbs
Dual double tandem: 790000 lbs

So looks like it's in x1000 kgs this time!  Wow! And a bit restrictive if I have to class a B777 as DT.

Now if:

S = Single Wheel

View Large View Medium
Click here for bigger photo!

Photo © Tony Zeljeznjak


D = Double wheel

View Large View Medium
Click here for bigger photo!

Photo © Wolfgang Hut - TCAS


DT = Double tandem

View Large View Medium
Click here for bigger photo!

Photo © Pereslavtsev Alex


and

DDT = Dual Double Tandem

View Large View Medium
Click here for bigger photo!

Photo © Aaron Lupton - AirTeamImages



Does that mean

TRT = Triple Tandem?

View Large View Medium
Click here for bigger photo!

Photo © Tony Zeljeznjak



Although TRT is hardly ever quoted  Sad



That's the USA sorted, but Alaska is even more Confusing!

S = Single Wheel
T = Twin wheel
DT = Double tandem
ST = ?
TT = ?
TDT = ?
DDT = Dual Double Tandem

As I don't go there, guess it's not that important  Big grin


User currently offlineArmitageShanks From UK - England, joined Dec 2003, 3638 posts, RR: 15
Reply 3, posted (10 years 7 months 2 weeks 1 day 1 hour ago) and read 14087 times:

Could the 777 be the TDT one? Triple Double Tandem?

User currently offlineSIDsandSTARs From United Kingdom, joined Oct 2002, 7 posts, RR: 0
Reply 4, posted (10 years 7 months 2 weeks 5 hours ago) and read 14022 times:

Could be Armitage, but should I be effectively guessing at this? Surely I should be able to find an official decode somewhere?

User currently offlineSIDsandSTARs From United Kingdom, joined Oct 2002, 7 posts, RR: 0
Reply 5, posted (10 years 7 months 2 weeks 4 hours ago) and read 14012 times:

Ok, I've been searching round the FAA web site all day looking for this "official decode"

This page http://www.naco.faa.gov/content/naco/online/airportdiagrams/legendAD.pdf has the remark

"Runway Weight Bearing Capacity/or PCN Pavement Classification Number is shown as a codified expression.
Refer to the appropriate Supplement/Directory for the applicable codes e.g.
Rwy 14-32 S75, T185, ST175, TT325."

Only problem is I don't have access to the "appropriate Supplement/Directory" http://www.naco.faa.gov/index.asp?xml=naco/catalog/charts/supplementary/af_directory

Anyone got a "NACO Airport/Facility Directory" they could look this decode up in for me?


User currently offlineChdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 6, posted (10 years 7 months 1 week 6 days 1 hour ago) and read 13926 times:

This is from my military books, so some of the examples are mil acft, but you can make the connections as needed-

• S - Single Wheel type landing gear DC-3
• D - Dual wheel type landing gear DC-6
• T - Twin wheel landing gear DC-6
ST - Single-tandem type landing gear C-130
• SBTT - Single-Belly Twin Tandem landing gear DC-10
DT - Dual-tandem type landing gear B707
TT - Twin-tandem type (includes quadricycle landing gear B-52) C-135
• TRT - Triple-tandem landing gear C-17
• DDT - Double dual-tandem landing gear B747
• TDT - Twin delta-tandem landing gear C-5

I have never heard of the B except in SBTT??

Hope it helps
ChD



"Never trust a clean Crew Chief"
User currently offlineSIDsandSTARs From United Kingdom, joined Oct 2002, 7 posts, RR: 0
Reply 7, posted (10 years 7 months 1 week 6 days ago) and read 13913 times:

Thanks ChD, yep that helps.  Smile

Top Of Page
Forum Index

Reply To This Topic Runway Bearing Strength.
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
PCN, Subgrade Strength, Tyre KPa, Runway Length... posted Sun Jul 9 2006 00:14:04 by NZ8800
Anyone Landed At Wrong Airport Or Runway? posted Fri Nov 10 2006 12:33:28 by Redcordes
SXM Runway Length Question... posted Fri Nov 3 2006 19:51:57 by T7ILS13LatJFK
How Does ATC Choose Which Runway To Land On? posted Wed Oct 18 2006 23:24:10 by Fll2993
Runway Marking Help?!?! posted Sat Sep 30 2006 22:58:47 by Jamesbuk
Modern Bearing Technology posted Sun Sep 24 2006 06:57:15 by 2H4
BOS Runway 14/32 Approach posted Fri Sep 22 2006 16:19:00 by Vikkyvik
Building A New Runway: How Far From Buildings? posted Tue Aug 15 2006 22:08:36 by GodBless
Runway Headings At EWR,JFK,LGA posted Wed Aug 9 2006 02:59:15 by Cs03
Minimum Runway Length For 747 posted Wed Aug 9 2006 00:17:07 by Boston92
Boeing Renton Runway posted Mon Nov 21 2011 14:48:12 by jetblueguy22
Runway Numbering Questions: 02/19? posted Tue Oct 11 2011 03:46:30 by a380900

Sponsor Message:
Printer friendly format