(e) Voice Communication Capabilities (Item 10a) The FAA does not require indication of voice communication capabilities in a flight plan for domestic flights, but it is permissible. For flights outside the domestic United States, all relevant capabilities must be indicated as follows (See TBL 4-11): TBL 4-11 Voice Communication Capabilities Capability Item 10a VHF Radio UHF Radio HF Radio VHF Radio (8.33 kHZ Spacing) ATC SATVOICE (INMARSAT) M1 ATC SATVOICE (Iridium) M3 (f) Approach Aid Capabilities (Item 10a). The FAA does not require filing of approach aid capability in order to request a specific type of approach, however any of the codes indicated in TBL 4-12 in 10re permissible. International flights may be required to indicate approach capability, based on instructions from relevant service providers. TBL 4-12 Approach Aid Capabilities Capability Item 10a ILS MLS LPV Approach (APV with SBAS) (WAAS) GBAS Landing System (LAAS) 6. Performance-Based Navigation Routes (Item 10a, Item 18 PBN/, Item 18 NAV/)- When planning to fly routes that require PBN capability, file the appropriate capability as shown in TBL 4-13. Appendix 4-10 FAA Form 7233-4 - International Flight Plan