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AIM

10/12/17

5−1−24

Preflight

alternate aerodromes; or, if no location identifier(s)

have been assigned;

(2) Insert ZZZZ and specify the name of the

aerodrome in Item 18, following the characters

ALTN/.

EXAMPLE−
1. KDFW0234  KPWA
2. KBOS0304  ZZZZ
NOTE−

Although alternate airport information filed in an FPL will

be accepted by air traffic computer systems, it will not be

presented to controllers. If diversion to an alternate airport

becomes necessary, pilots are expected to notify ATC and

request an amended clearance.

8. Item 18. Other Information

(a) Insert 0 (zero) if no other information; or,

any other necessary information in the sequence

shown below, in the form of the appropriate indicator

followed by an oblique stroke and the information to

be recorded:

NOTE−

1. Operators are warned that the use of indicators not

included in the provisions may result in data being rejected,

processed incorrectly, or lost.
2. Hyphens “-” or oblique strokes “/” should only be used
as described.
3. Avoid use of any other special characters in Field 18
information- use only letters and numbers.
4. An indicator without any associated information will
result in flight plan rejection.

(b) STS/ Reason for special handling by ATS

as follows:

(1) ALTRV: For a flight operated in

accordance with an altitude reservation.

(2) ATFMX: For a flight approved for

exemption from ATFM measures by the appropriate

ATS authority.

(3) FFR: Fire-fighting.

(4) FLTCK: Flight check for calibration of

navaids.

(5) HAZMAT: For a flight carrying haz-

ardous material.

(6) HEAD: A flight with Head of State

status.

(7) HOSP: For a medical flight declared by

medical authorities.

(8) HUM: For a flight operating on a

humanitarian mission.

(9) MARSA: For a flight for which a

military entity assumes responsibility for separation

of military aircraft.

(10) MEDEVAC: For a life critical medical

emergency evacuation.

(11) NONRVSM: For a non-RVSM capa-

ble flight intending to operate in RVSM airspace.

(12) SAR: For a flight engaged in a search

and rescue mission.

(13) STATE: For a flight engaged in

military, customs, or police services.

NOTE−

Other reasons for special handling by ATS are denoted

under the designator RMK/.

(c) PBN/ Indication of RNAV and/or RNP

capabilities. Include as many of the descriptors below

as apply to the flight, up to a maximum of 8 entries;

that is a total of not more than 16 characters.

TBL 5−1−6

PBN/RNAV Specifications

PBN/

RNAV SPECIFICATIONS

A1

RNAV 10 (RNP 10)

B1

RNAV 5 all permitted sensors

B2

RNAV 5 GNSS

B3

RNAV 5 DME/DME

B4

RNAV 5 VOR/DME

B5

RNAV 5 INS or IRS

B6

RNAV 5 LORAN C

C1

RNAV 2 all permitted sensors

C2

RNAV 2 GNSS

C3

RNAV 2 DME/DME

C4

RNAV 2 DME/DME/IRU

D1

RNAV 1 all permitted sensors

D2

RNAV 1 GNSS

D3

RNAV 1 DME/DME

D4

RNAV 1 DME/DME/IRU