`
                            PREFERRED ROUTE
                        DATA BASE RECORD LAYOUT
                              (PFR-FILE)

INFORMATION EFFECTIVE DATE: 07/19/2018

    RECORD FORMAT: FIXED
    LOGICAL RECORD LENGTH: 344



FILE STRUCTURE DESCRIPTION:
---------------------------

    THERE ARE A VARIABLE NUMBER OF FIXED-LENGTH RECORDS FOR
    EACH PREFERRED ROUTE (PFR).  THE NUMBER OF RECORDS IS
    DETERMINED BY THE NUMBER OF SEGMENTS USED TO DESCRIBE THE
    ROUTE. THE DIFFERENT RECORD TYPES WILL BE IDENTIFIABLE BY A
    RECORD TYPE INDICATOR (PFR1 OR PFR2) AND THE ROUTE IDENTIFIER
    (ORIGIN IDENT, DESTINATION IDENT, AND ROUTE TYPE CODE). BECAUSE
    THERE CAN BE MORE THAN ONE PREFERRED ROUTE BETWEEN TWO LOCATIONS,
    A SEQUENCE NUMBER IS INCLUDED IN THE ROUTE IDENTIFIER TO INSURE
    THAT A UNIQUE ROUTE IDENTIFIER IS PRESENT. THE ROUTE SEGMENT
    RECORDS ARE ALSO ORDERED BY A SEQUENCE NUMBER. THE FILE IS
    SORTED BY ROUTE ID, RECORD TYPE, AND SEGMENT SEQUENCE NUMBER.

    EACH RECORD ENDS WITH A CARRIAGE RETURN CHARACTER AND LINE FEED
    CHARACTER (CR/LF). THIS LINE TERMINATOR IS NOT INCLUDED IN THE
    LOGICAL RECORD LENGTH.

DESCRIPTION OF THE RECORD TYPES:
--------------------------------

    'PFR1' RECORD TYPE CONTAINS THE BASE PREFERRED ROUTE DATA.
    IT CONTAINS DESCRIPTIVE INFORMATION THAT IS APPLICABLE TO THE
    ENTIRE ROUTE. THERE IS ALWAYS A PFR1 RECORD.

    'PFR2' RECORD TYPE CONTAINS DATA TO DESCRIBE ONE SEGMENT ALONG
    THE ROUTE. IT IDENTIFIES THE SEGMENT TYPE (AIRWAY, NAVAID,
    FIX, ETC.) AND PROVIDES ADDITIONAL INFORMATION TO DESCRIBE
    THE SEGMENT, DEPENDING ON THE TYPE OF SEGMENT. THERE CAN BE
    ANY NUMBER OF PFR2 RECORDS (INCLUDING NONE AT ALL).


GENERAL INFORMATION:
--------------------
     1.  LEFT JUSTIFIED FIELDS HAVE TRAILING BLANKS
     2.  RIGHT JUSTIFIED FIELDS HAVE LEADING BLANKS
     3.  ELEMENT NUMBER IS FOR INTERNAL REFERENCE ONLY
         AND NOT IN RECORD
     4.  THE PFR ROUTE ID (ELEMENT NUMBER:DLID) IS MADE UP OF THE ORIGIN IDENT,
         DESTINATION IDENT, ROUTE TYPE, AND A SEQUENCE NUMBER TO DISTINGUISH
         MULTIPLE ROUTES BETWEEN TWO POINTS.

         Note: For Tower Enroute Control (TEC) routes in the Northern 
         California TRACON (NORCAL), the "Aircraft Allowed/Limitations 
         Description" column is also used to include a local "Route ID", e.g. 
         HWD01, SJC73, OAK10.  The "Route Direction Limitations Description" 
         may contain a code that indicates this route is used when SFO is in 
         either "East" or "West" traffic configuration, e.g. SFOE, SFOW.

         For TEC routes in the Southern California TRACON (SOCAL), the "Route 
         Direction Limitations Description" column will contain this local 
         "Route ID", e.g. CSTP54, BURP16, ONTP12. 

         These "Route IDs" are local conventions of the respective TRACONs. 


*********************************************************************

            'PFR1' RECORD TYPE - BASE ROUTE DATA

********************************************************************

J  T   L   S L   E N
U  Y   E   T O   L U
S  P   N   A C   E M
T  E   G   R A   M B
       T   T T   E E
       H     I   N R
             O   T
             N           FIELD DESCRIPTION


L AN   04 00001  N/A     RECORD TYPE INDICATOR.
                           PFR1:  BASE ROUTE DATA
L AN 0005 00005  DLID    ORIGIN FACILITY LOCATION IDENTIFIER
                         (DEPENDING ON NAR TYPE AND DIRECTION, 
                         ORIGIN FACILITY IS EITHER COASTAL FIX
                         OR INLAND NAV FACILITY OR FIX*)
L AN 0005 00010  DLID    DESTINATION FACILITY LOCATION IDENTIFIER
                         (DEPENDING ON NAR TYPE AND DIRECTION, 
                         DESTINATION FACILITY IS EITHER AIRPORT, 
                         COASTAL FIX OR INLAND NAV FACILITY OR FIX*)
L AN 0003 00015  DLID    TYPE OF PREFERRED ROUTE (CODE)
                           L, H, LSD, HSD, SLD, SHD, TEC, NAR
                             (FULLY DESCRIBED BELOW)
R  N 0002 00018  DLID    ROUTE IDENTIFIER SEQUENCE NUMBER (1-99)
L AN 0030 00020  N/A     TYPE OF PREFERRED ROUTE (DESCRIPTION)

                         CODE   DESCRIPTION
                         ----   -------------------------------

                         L      LOW ALTITUDE
                         H      HIGH ALTITUDE
                         LSD    LOW ALT SINGLE DIR
                         HSD    HIGH ALT SINGLE DIR
                         SLD    SPECIAL LOW ALT DIRECTIONAL
                         SHD    SPECIAL HIGH ALT DIRECTIONAL
                         TEC    TOWER ENROUTE CONTROL
                         NAR    NORTH AMERICAN ROUTE
                         
L AN 0075 00050  PR20    PREFERRED ROUTE AREA DESCRIPTION
L AN 0040 00125  PR21    PREFERRED ROUTE ALTITUDE DESCRIPTION
L AN 0050 00165  PR22    AIRCRAFT ALLOWED/LIMITATIONS DESCRIPTION
L AN 0015 00215  PR25    EFFECTIVE HOURS (GMT) DESCRIPTION (1)
                         *  ALL PREFERRED IFR ROUTES ARE IN EFFECT
                            CONTINUOUSLY UNLESS OTHERWISE NOTED.
L AN 0015 00230  PR25    EFFECTIVE HOURS (GMT) DESCRIPTION (2)
L AN 0015 00245  PR25    EFFECTIVE HOURS (GMT) DESCRIPTION (3)
L AN 0020 00260  PR26    ROUTE DIRECTION LIMITATIONS DESCRIPTION
L AN 0020 00280  N/A     NAR TYPE (COMMON,NON-COMMON) 
L AN 0005 00300  N/A     DESIGNATOR
L AN 0040 00305  N/A     DESTINATION CITY
                         
                         *FOR NAR TYPE ROUTES
                         COMMON EASTBOUND
                         INLAND NAV FAC OR FIX > COASTAL FIX
                         COMMON WESTBOUND
                         COASTAL FIX > INLAND NAV FAC OR FIX 
                         NON-COMMON (EITHER DIRECTION)
                         INLAND NAV FAC OR FIX > DESTINATION


********************************************************************

     'PFR2' RECORD TYPE - PREFERRED ROUTE SEGMENT DESCRIPTION

*******************************************************************

J  T   L   S L   E N
U  Y   E   T O   L U
S  P   N   A C   E M
T  E   G   R A   M B
       T   T T   E E
       H     I   N R
             O   T
             N           FIELD DESCRIPTION

L AN   04 00001  N/A     RECORD TYPE INDICATOR.
                           PFR2:  PREFERRED ROUTE SEGMENT DATA
L AN 0005 00005  DLID    ORIGIN FACILITY LOCATION IDENTIFIER
L AN 0005 00010  DLID    DESTINATION FACILITY LOCATION IDENTIFIER
L AN 0003 00015  DLID    TYPE OF PREFERRED ROUTE (CODE)
                           L, H ,LSD, HSD, SLD, SHD, TEC, NAR
                             (FULLY DESCRIBED BELOW)
R  N 0002 00018  DLID    ROUTE IDENTIFIER SEQUENCE NUMBER (1-99)
L AN 0003 00020  PR23/4  SEGMENT SEQUENCE NUMBER WITHIN THE ROUTE
L AN 0048 00023  PR23/4  SEGMENT IDENTIFIER (NAVAID IDENT, AWY NUMBER
                           FIX NAME, DP NAME, STAR NAME)
L AN 0007 00071  GEN     SEGMENT TYPE (DESCRIBED)
                           AIRWAY,FIX,DP,STAR,NAVAID,UNKNOWN
L AN 0002 00078  PR23    FIX STATE CODE - POST OFFICE ALPHA CODE
                           BLANK IF NOT A FIX SEGMENT
L AN 0002 00080  N/A     ICAO REGION CODE
L AN 0002 00082  PR23    NAVAID FACILITY TYPE (CODE)
                           C,D,F,L,M,MD,O,OD,R,RD,T,U,V
                           CODES ARE DESCRIBED BELOW
                           BLANK IF NOT A NAVAID SEGMENT
L AN 0020 00084  PR23    NAVAID FACILITY TYPE (DESCRIBED)
                           BLANK IF NOT A NAVAID SEGMENT

                           CODE   DESCRIPTION
                           ----   ------------------------
                             C    VORTAC
                             D    VOR-DME
                             F    FAN MARKER
                             L    LFR
                             M    MARINE NDB
                             MD   MARINE NDB/DME
                             O    VOT
                             OD   DME
                             R    NDB
                             RD   NDB/DME
                             T    TACAN
                             U    UHF NDB
                             V    VOR

L AN 0007 00104  PR23    RADIAL AND DISTANCE FROM NAVAID
                           RRR OR RRR/DDD
                           BLANK IF NOT A NAVAID SEGMENT
                           BLANK IF SEGMENT IS DIRECTLY TO THE NAVAID
L AN 0234 00111  N/A       BLANK


