AIM 8/15/19  1/30/20 b. Explanation of Items Filed in FAA Form 7233 − 4 3. Item 9. Number, Type of Aircraft, and Wake Turbulence Category. NOTE − EXAMPLE − 2. Item 8. Flight Rules and Type of Flight. 4. Item 10. Equipment NOTE − Procedures and other information provided in this section are designed to assist operators using FAA Form 7233 − 4 to file IFR flight plans for flights that will be conducted entirely within U.S. domestic airspace. Requirements and procedures for operating outside U.S. domestic airspace may vary significant- ly from country to country. It is, therefore, recommended that operators planning flights out- side U.S. domestic airspace become familiar with applicable international documents, including Aero- nautical Information Publications (AIP); and ICAO Document 4444, Procedures for Air Navigation Services/Air Traffic Management, Appendix 2. FAA Form 7233 − 4 is shown in FIG 5 − 1 − 3. The filer is normally responsible for providing the information required in Items 3 through 19. 1. Item 7. Aircraft Identification.  Insert the full registration number of the aircraft, or the approved FAA/ICAO company or organizational designator, followed by the flight number. N235RA, AAL3342, BONGO33 Callsigns filed in this item must begin with a letter followed by 1 − 6 additional alphanumeric characters. (a) Flight Rules. Insert the character “I” to indicate IFR (b) Type of Flight. Insert one of the following letters to denote the type of flight: (1) S  if scheduled air service (2) N  if non − scheduled air transport operation (3) G  if general aviation (4) M  if military (5) X  if other than any of the defined categories above. NOTE − Type of flight is optional for flights that will be conducted entirely within U.S. domestic airspace. (a) Number. Insert the number of aircraft, if more than 1 (maximum 99). (b) Type of Aircraft. (1) Insert the appropriate designator as specified in ICAO Doc 8643, Aircraft Type Designators; (2) Or, if no such designator has been assigned, or in the case of formation flights consisting of more than one type; (3) Insert ZZZZ, and specify in Item 18, the (numbers and) type(s) of aircraft preceded by TYP/. (c) Wake Turbulence Category. Insert an oblique stroke followed by one of the following letters to indicate the wake turbulence category of the aircraft: (1) H — HEAVY, to indicate an aircraft type with a maximum certificated takeoff weight of 300,000 pounds (136 000 kg), or more; (2) M — MEDIUM, to indicate an aircraft type with a maximum certificated takeoff weight of less than 300,000 pounds (136,000 kg), but more than 15,500 pounds (7,000 kg); (3) L — LIGHT, to indicate an aircraft type with a maximum certificated takeoff weight of 15,500 pounds (7,000 kg) or less. 5 − 1 − 19 Preflight