` PREFERRED ROUTE DATA BASE RECORD LAYOUT (PFR-FILE) INFORMATION EFFECTIVE DATE: 06/15/2000 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 0015 00023 PR23/4 SEGMENT IDENTIFIER (NAVAID IDENT, AWY NUMBER FIX NAME, SID NAME, STAR NAME) L AN 0007 00038 GEN SEGMENT TYPE (DESCRIBED) AIRWAY,FIX,SID,STAR,NAVAID,UNKNOWN L AN 0002 00045 PR23 FIX STATE CODE - POST OFFICE ALPHA CODE BLANK IF NOT A FIX SEGMENT L AN 0002 00047 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 00049 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 00069 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 0189 00076 N/A BLANK