(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 Transponder with Mode 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 Aircraft ID Altitude Encoding Item 10b Mode S Transponder No No Mode S Transponder No Yes Mode S Transponder Yes No Mode S Transponder Yes Yes Mode S Transponder with Extended Squitter Yes Yes Enhanced Mode S Transponder Yes Yes Enhanced Mode S Transponder with Extended Squitter Yes Yes Capability (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 Item 10b Item 18 SUR/ B1 260B 1090 ES Out and In Capability B2 260B UAT Out Capability U1 282B UAT Out and In Capability U2 282B Capability 1090 ES Out Capability FAA Form 7233-4 - International Flight Plan Appendix 4-9