b. Explanation of Items Filed in FAA Form
7233-4
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 significantly from country to country. It is, therefore,
recommended that operators planning flights outside U.S. domestic airspace become familiar with
applicable international documents, including Aeronautical Information Publications (AIP); and ICAO
Document 4444, Procedures for Air Navigation
Services/Air Traffic Management, Appendix 2.
NOTE-
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.
EXAMPLE-
N235RA, AAL3342, BONGO33
NOTE-
Callsigns filed in this item must begin with a letter followed
by 1-6 additional alphanumeric characters.

2. Item 8. Flight Rules and Type of Flight.
(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

5-1-18

(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.

3. Item 9. Number, Type of Aircraft, and
Wake Turbulence Category.
(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.
4. Item 10. Equipment

Preflight