FLIGHT RULES - Identify the type of Flight Plan by one of the following letters:
I - If IFR Y - If IFR then VFR
V - If VFR Z - If VFR then IFR

If Y or Z is entered, specify in Item 15 where the Change of Flight Rules is planned. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - TYPE OF FLIGHT - Enter one of the following letters to denote the type of flight when so required by the appropriate Air Traffic Service authority. S - Scheduled Air Transport G - General Aviation N - Nonscheduled Air Transport M - Military X - Other than any of the defined categories above.
Item 9

NUMBER OF AIRCRAFT -If one aircraft, indicate type only. If more than one, insert number of aircraft.
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TYPE OF AIRCRAFT - Enter military designator of aircraft omitting prefixes and suffixes pertaining to aircraft mission or model, e.g., F4, C141, T39. If the flight consists of different types of aircraft in formation, use the 4 letter group "ZZZZ". If "ZZZZ" is used, the number and type(s) of aircraft will be indicated in Item 18 preceded by the abbreviation "Typ/", e.g., Typ/4F4-4F16. Civil users enter appropriate ICAO designator.
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WAKE TURBULENCE CATEGORY - Insert a "/" then add a letter indicating the Wake Turbulence Category (maximum certificated
aircraft take-off weight) as follows: H - HEAVY . . . . . . 300,000 lbs or more. M - MEDIUM . . . . 15,501 to 299,999 lbs. L - LIGHT . . . . . . . .15,500 lbs or less.
Item 10

EQUIPMENT: COM/NAV/Approach Aid equipment - Enter the letter "S" if standard COM/NAV/Approach Aid equipment for the route to be flown is carried and serviceable. (See NOTE 1)
If the aircraft is not FM immune, mark the DD1801, Block 10 with a Z and in Block 18 write NAV/NON-FM IMMUNE VOR/ILS. Do not mark DD1801, Block 10, with S. (An S indicates the aircraft VHF VOR/ILS nav receiver is FM immune compliant.) WARNING: this information cannot be guaranteed to reach the destination approach controller.
If aircraft is BRNAV certified, but not FM immune, additionally insert R (RNP) and T (TACAN), if equipped, in DD1801, Block 10 (e.g., RTZ/C).
If aircraft is neither BRNAV certified nor FM immune, aircraft is TACAN only and clearances must specify TACAN or VORTAC fixes and approaches. (Ref FLIP GP, Chapter 2) Insert T ( TACAN) in DD1801, Block 10 (e.g. TZ/C).
If "S" is entered and other COM/NAV/Approach Aid equipment is required to fly the route (such as LORAN), list other appropriate letters to identify the additional serviceable equipment on board.
If "S" is not entered, list the appropriate letters to identify the serviceable COM/NAV/Approach Aid equipment on board which can be used for the route to be flown.
Enter the letter "N" if no COM/NAV/Approach Aid equipment for the route to be flown is carried, or the equipment is unserviceable.
The following letters are assigned to equipment on board aircraft: A - Not allocated I - Inertial Navigation R - RNP type certification (See NOTE 3) B - Not allocated J - (Data Link) (See NOTE 2) T - TACAN C - LORAN C K - (MLS) U - UHF RTF D - DME L - ILS V - VHF RTF E - Not allocated M - Not allocated W - RVSM approved aircraft F - ADF O - VOR X - When prescribed by ATS G - (GNSS) P - Not allocated Y - When prescribed by ATS H - HF RTF Q - Not allocated Z - Other equipment carried (See NOTE 4)
　
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