SIDsandSTARs
Topic Author
Posts: 7
Joined: Mon Oct 07, 2002 1:12 am

Runway Bearing Strength.

Fri Apr 16, 2004 5:34 pm

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?
 
Tiger119
Posts: 1593
Joined: Wed Sep 10, 2003 1:52 pm

RE: Runway Bearing Strength.

Fri Apr 16, 2004 6:06 pm

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!
 
SIDsandSTARs
Topic Author
Posts: 7
Joined: Mon Oct 07, 2002 1:12 am

RE: Runway Bearing Strength.

Fri Apr 16, 2004 9:14 pm

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

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Photo © Tony Zeljeznjak


D = Double wheel

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Photo © Wolfgang Hut - TCAS


DT = Double tandem

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Click here for bigger photo!

Photo © Pereslavtsev Alex


and

DDT = Dual Double Tandem

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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
 
ArmitageShanks
Posts: 3755
Joined: Tue Dec 30, 2003 5:30 am

RE: Runway Bearing Strength.

Fri Apr 16, 2004 11:47 pm

Could the 777 be the TDT one? Triple Double Tandem?
 
SIDsandSTARs
Topic Author
Posts: 7
Joined: Mon Oct 07, 2002 1:12 am

RE: Runway Bearing Strength.

Sat Apr 17, 2004 7:30 pm

Could be Armitage, but should I be effectively guessing at this? Surely I should be able to find an official decode somewhere?
 
SIDsandSTARs
Topic Author
Posts: 7
Joined: Mon Oct 07, 2002 1:12 am

RE: Runway Bearing Strength.

Sat Apr 17, 2004 8:44 pm

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?
 
chdmcmanus
Posts: 372
Joined: Wed Mar 21, 2001 12:53 am

RE: Runway Bearing Strength.

Sun Apr 18, 2004 11:29 pm

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"
 
SIDsandSTARs
Topic Author
Posts: 7
Joined: Mon Oct 07, 2002 1:12 am

RE: Runway Bearing Strength.

Mon Apr 19, 2004 12:27 am

Thanks ChD, yep that helps.  Smile

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