A342
Topic Author
Posts: 4017
Joined: Sun Jul 31, 2005 11:05 pm

Help Needed With Part 139 Aircraft Design Groups

On a website about TEX, I found the following quote:

"Airline operations: RSTD TO FAR 139 DESIGN GROUPS AI; AII; AIII; BI AND BII."

But nowhere I could find explanations for these design groups. Maybe you can help me.

A342
Exceptions confirm the rule.

N231YE
Posts: 2620
Joined: Tue Jul 25, 2006 9:24 am

RE: Help Needed With Part 139 Aircraft Design Groups

I believe that that is airport reference code (ARC).

If so, then the first character (the letter) is the aircraft approach category, and the second character (the number) is the aircraft design category based on wing span.

corey07850
Posts: 2335
Joined: Wed Feb 04, 2004 4:33 am

RE: Help Needed With Part 139 Aircraft Design Groups

It's based on wingspan and approach speed:

Wingspan:
I = <49'
II= 49-78'
III= 79-117'
IV= 118-170'
V= 171-213'
VI= 214-262'

App. Speeds:
A= <91kts
B= 91-120kts
C= 121-140kts
D= 141-165kts
E= >166kts

A342
Topic Author
Posts: 4017
Joined: Sun Jul 31, 2005 11:05 pm

RE: Help Needed With Part 139 Aircraft Design Groups

 Quoting Corey07850 (Reply 2):It's based on wingspan and approach speed:

Thank you, that was helpful !
Exceptions confirm the rule.

kc135topboom
Posts: 11031
Joined: Sun Jan 30, 2005 2:26 am

RE: Help Needed With Part 139 Aircraft Design Groups

 Quoting Corey07850 (Reply 2):It's based on wingspan and approach speed: Wingspan: I = <49' II= 49-78' III= 79-117' IV= 118-170' V= 171-213' VI= 214-262' App. Speeds: A= <91kts B= 91-120kts C= 121-140kts D= 141-165kts E= >166kts

No, aircraft design groups (ADG) is based on wingspan only. The aircraft approach catagory is based on final approach speeds. You can find the ADG in AC150/5300, Airport Design. ADG VI is a new catgory created just for the An-124, A-380, and B-747-8.

corey07850
Posts: 2335
Joined: Wed Feb 04, 2004 4:33 am

RE: Help Needed With Part 139 Aircraft Design Groups

 Quoting KC135TopBoom (Reply 4):No, aircraft design groups (ADG) is based on wingspan only. The aircraft approach catagory is based on final approach speeds. You can find the ADG in AC150/5300, Airport Design. ADG VI is a new catgory created just for the An-124, A-380, and B-747-8.

What the original poster provided (AI, AII, BII, etc) are referred to as Airport Reference Codes... The first letter refers to the category of approach speed (of which I provided before) and the Roman numeral refers to the aircraft's classification based on their wingspan (of which I provided above)...

For example an aircraft with an ARC of "AI" would mean a plane with a wingspan less than 49' and an approach speed of less than 91 knots.

The terminology provided by the original poster isn't worded correctly... Look up AC150/5300-13 Appendix 13 for a list of aircraft based on their ARC. It's not so much a Part 139 thing as it is an Advisory Circular

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