12/2/21 

AIM 

(c) Transponder Capabilities (Item 10b) 

  For domestic flights, it is not necessary to indicate Mode S capability. It is acceptable to simply 

file one of the following codes in TBL 4

−

8. 

TBL 4

−

8 

Mode C 

Capability 

Item 10b 

Transponder with no Mode C 

A 

Transponder with Mode C 

C 

  International flights must file in accordance with relevant AIPs and regional supplements. Include 

one of the Mode S codes in TBL 4

−

9, if appropriate. 

NOTE

−

 

File only one transponder code. 

TBL 4

−

9 

Mode S 

Capability 

Aircraft 

ID 

Altitude 

Encoding 

Item 

10b 

Mode S Transponder 

No 

No 

X 

Mode S Transponder 

No 

Yes 

P 

Mode S Transponder 

Yes 

No 

I 

Mode S Transponder 

Yes 

Yes 

S 

Mode S Transponder with Extended Squitter 

Yes 

Yes 

E 

Enhanced Mode S Transponder 

Yes 

Yes 

H 

Enhanced Mode S Transponder with Extended Squitter 

Yes 

Yes 

L 

(d) ADS

−

B Capabilities (Item 10b, Item 18 SUR/ and Item 18 CODE/) 

  Indicate ADS

−

B capability as shown in TBL 4

−

10. The accompanying entry in Item 18 indicates 

that the equipment is compliant with 14 CFR §91.227. Some ADS

−

B equipment used in other countries is 

based on an earlier standard and does not meet U.S. requirements. 

  Do not file an ADS

−

B code for “in” capability only. There is currently no way to indicate that an 

aircraft has “in” capability but no “out” capability. 

  For aircraft with ADS

−

B “out” on one frequency and “in” on another, include only the ADS

−

B 

“out” code. For example, B1 or U1, (See TBL 4

−

10). 

TBL 4

−

10 

ADS

−

B Capabilities 

Capability 

Item 

10b 

Item 18 

SUR/ 

1090 ES Out Capability 

B1 

260B 

1090 ES Out and In Capability 

B2 

260B 

UAT Out Capability 

U1 

282B 

UAT Out and In Capability 

U2 

282B 

FAA Form 7233

−

4 

−

 International Flight Plan 

Appendix 4

−

9