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

INFORMATION EFFECTIVE DATE: 07/05/2007  
 
    RECORD FORMAT: FIXED  
    LOGICAL RECORD LENGTH: 264  
 
  
  
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.  
  
*********************************************************************  
  
            '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  
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  
                             (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  
  
L AN 0075 00050  PR20    PREFERRED ROUTE AREA DESCRIPTION  
L AN 0040 00125  PR21    PREFERRED ROUTE ALTITUDE DESCRIPTION  
L AN 0035 00165  PR22    AIRCRAFT ALLOWED/LIMITATIONS DESCRIPTION  
L AN 0015 00200  PR25    EFFECTIVE HOURS (GMT) DESCRIPTION (1)  
L AN 0015 00215  PR25    EFFECTIVE HOURS (GMT) DESCRIPTION (2)  
L AN 0015 00230  PR25    EFFECTIVE HOURS (GMT) DESCRIPTION (3)  
L AN 0020 00245  PR26    ROUTE DIRECTION LIMITATIONS DESCRIPTION  
  
   
********************************************************************  
  
     '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  
                             (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  PR23    NAVAID FACILITY TYPE (CODE)  
                           C,D,F,L,M,MD,O,R,RD,T,U,V  
                           CODES ARE DESCRIBED BELOW  
                           BLANK IF NOT A NAVAID SEGMENT  
L AN 0020 00082  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  
                             R    NDB  
                             RD   NDB/DME  
                             T    TACAN  
                             U    UHF NDB  
                             V    VOR  
  
L AN 0007 00102  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 0156 00109  N/A       BLANK 

