SALLJEX Aircraft: P-3 Meteorology Navigation and State Parameters - Standard Tape Format (NOAA/AOC) 1.0 General Information The SALLJEX Aircraft: P-3 Meteorology Navigation and State Parameters dataset in NOAA/AOC Standard Tape format is one of several datasets archived by the University Corporation for Atmospheric Research/Joint Office for Science Support (UCAR/JOSS) in support of the South American Low Level Jet EXperiment (SALLJEX). The data were collected by the National Oceanic and Atmospheric Administration/ Aircraft Operations Center P-3 aircraft (NOAA/AOC). 2.0 Data Contact Jose Meitin (meitin@ucar.edu) 3.0 Data and Format Information 3.1 Detailed Data Description This dataset is comprised of binary data files in NOAA/AOC Standard Tape Format. Data collected aboard the NOAA P-3 aircraft by AOC are stored to tape and labeled by flight number. The flight number consists of the year, month, and day of the flight presented as YYMMDD, followed by a one-letter designator indicating which P-3 the data came from. For example, flight number 010901i indicates the data were collected aboard the NOAA43 P-3 on Sept 1, 2001. See table 3.1.1 for a complete list of possible designators. Note that only the NOAA43 was flown during SALLJEX, so all data files have names like YYMMDDi. Table 3.1.1 - aircraft designators Aircraft Designator Notes NOAA42 (N42RF) H First P3 NOAA43 (N43RF) I Second P3 During a P-3 flight, data are collected at two different rates: fast and slow. Slow data is collected at a rate of one record per second (1 Hz). The frequency at which fast data is collected varies. The lowest is 10 Hz for the radar altimeter 159 and 40 Hz for the the inertial parameters (lat,lon,heading,pitch, roll,etc.). After a flight, all output from the standard suite of instrumentation aboard the P3 are quality controlled (QC) with respect to other similar values. A choice is made of which pressure and temperature values will be used and modifications/edits are made to erroneous data that may be observed for the selected sensors. All pressure and temperature sensors are bench calibrated once a year. The data are stored in two types of records. Slow data records are always 440 bytes long. Ten slow data records are output to the file at a time, creating 4400 byte data blocks. Fast and slow data are interleaved onto a single tape. Fast data files always include slow data. Slow data files may contain fast data as well. All of the data are raw field data. The output of this process is data in the NOAA/AOC Standard Tape Format. This is the data provided in this dataset. 3.2 Detailed Format Description Conventions This data uses the following angle conventions. These are the same conventions used in the C-130 data. a) pitch: positive is nose up b) roll: positive is right wing down (facing forward) c) attack: positive has the airstream coming from below the aircraft's center line d) sideslip: positive has the airstream coming from the right side of the aircraft (facing forward) e) drift angle: positive has the ground track to the right of true heading For more information, refer to RAF Bulletin No. 23, Fig. 2.1 available on line: http://raf.atd.ucar.edu/Bulletins/bulletin23.html This data uses the following velocity conventions. These are the same conventions used in the C-130 data. a) U, E and X are E/W components (positive is to the east) b) V, N and Y are N/S components (positive is to the north) c) W is vertical component (positive is up, away from earth's surface) For more information, refer to RAF Bulletin No. 9 available on line: http://raf.atd.ucar.edu/Bulletins/b9appdx_B.html#WINDS Record format There are 6 record types within the AOC Standard Tape Format. These record types are as follows: TYPE 1 - HEADER RECORD. CONTAINS INFORMATION REGARDING FLIGHT IDENTIFICATION. TYPE 2 - ORIGINAL DATA TRANSFORMATION RECORD. CONTAINS COEFFICIENTS REQUIRED TO CONVERT ORIGINAL TAPE PARAMETERS TO SCIENTIFIC UNITS...RAW DATA ON RECORD 4 TO PROCESSED DATA ON RECORD 5. TYPE 3 - CONVERTED DATA TRANSFORMATION RECORD. ESSENTIALLY A METHOD FOR PROPER PLACING OF THE DECIMAL POINT IN RECORD 5. TYPE 4 - ORIGINAL DATA RECORD. TYPE 5 - CONVERTED/DERIVED DATA RECORD. TYPE 6 - TRAILER RECORD. Each record type is described in more detail below. Note that word address refers to the location in the record of the parameter. 3.2.1 TYPE 1 - HEADER RECORD WORD PARAMETER ------------------------------------- 1. TYPE OF RECORD (1) 2. NUMBER OF WORDS IN RECORD (17) 3. AIRCRAFT NUMBER (42 OR 43) 4. YEAR OF FLIGHT 5. MONTH 6. DAY 7. HOUR BEGINNNING OF FLIGHT 8. MINUTE 9. SECOND 10. HOUR END OF FLIGHT 11. MINUTE 12. SECOND 13. DATE PROCESSED MO DY Y (XXXXX) 14. DATE OF PROGRAM MO DY Y (XXXXX) 15. NOT USED 16. NOT USED 17. NUMBER OF TAPE 3.2.2 TYPE 2 - ORIGINAL DATA TRANSFORMATION RECORD IMPORTANT NOTES ON THE TYPE 2 RECORD FOR N43RF The word address refers to the location in the TYPE 4 record of the parameter. The four values following the word address are the static constants for that parameter as determined by AOC's calibration laboratory. Since the information on Record 4 of the standard tape is in engineering units (counts) a conversion coefficient must be applied to convert the counts to a voltage. Excluding the intercept (A0), the conversion coefficient is multiplied to the remaining static constants in the following manner: A1 = A1(static cal lab constant) * conversion coef. A2 = A2(static cal lab constant) * (conversion coef. **2) A3 = A3(static cal lab constant) * (conversion coef. **3) TRANSFORMATION RECORD - TYPE 2 WORD PARAMETER ----------------------------------------- 1. TYPE (2) 2. NUMBER OF WORDS IN RECORD (404) IF THE WORD ADDRESS IS POSITIVE THEN THE FOLLOWING FORMAT HOLDS TRUE, 3. WORD ADDRESS IN TYPE 4 RECORD 4. CUBIC COEFFICIENT A3 5. SQUARE COEFFICIENT A2 6. SLOPE A1 7. INTERCEPT A0 8. WORD ADDRESS IN TYPE 4 RECORD ETC. PARM(raw) = A3*(counts) + A2*(counts) + A1*(counts) + A0 ************************************************************************** If the word address is a negative number, the third and fourth numbers are coefficients used to compute the dynamic calibration constant for the parameter. The fifth number is the offset that was calculated from the most recent calibration flight. IF THE WORD ADDRESS IS NEGATIVE THEN THE FOLLOWING FORMAT HOLDS TRUE WORD PARAMETER ----------------------------------------- 8. WORD ADDRESS IN TYPE 4 RECORD 9. BLANK (ALL ZEROS) 10. SLOPE 11. INTERCEPT 12. OFFSET FROM TOWER FLY BY 13. WORD ADDRESS IN TYPE 4 RECORD ETC. ***************************************************************** The following lines of code describe the computation of the dynamic calibration constants for the parameters: NOTE!! PSW - Rosemount static pressure from wingtip PQW - Rosemount dynamic pressure from wingtip PSF - Rosemount static pressure from fuselage PQF1 - Rosemount dynamic pressure from fuselage (1281) PQF2 - Rosemount dynamic pressure from fuselage (1221) TT1 - Total temperature 1 from fuselage TT2 - Total temperature 2 from fuselage DW1 - Dewpoint temperature 1 DW2 - Dewpoint temperature 2 DAP - Measured dynamic attack pressure DBP - Measured dynamic slip pressure AP(1) - Measured attack pressure from fuselage BP(1) - Measured slip pressure from fuselage AA - Attack angle SA - Slip angle IMPORTANT NOTICE!!! Beginning with Hurricane Season 1993 the measured static and dynamic pressures will be dynamically corrected using the following equations, PQERR= .17701*pqm - .0129067*pqm**2 + .00190547*pqm**2.5 - 7.8284e-05*pqm**3, where pqm is measured dyn. pressure PQCOR = -PQERR ALTERR= -.35 + .50/(1.+(psm/410.)**(-25)) - (.15/(1.+(psm/640.)**(-12)), where psm is ALTCOR = -ALTERR measured static pressure PS = PSM + PQCOR + ALTCOR, corrected static pressure PQ = PQM - PQCOR - ALTCOR, corrected dynamic pressure These aforementioned equations are the results from a trailing cone flight. Word Equation -145 DW1(calc) = DW1(measured) + Offset -166 DW2(calc) = DW2(measured) + Offset -146 AA(calc) = Intercept + Slope*(AP(1)/DAP) -148 SA(calc) = Intercept + Slope*(BP(1)/DBP) 2. 404. 1.0000E+02 0.0000E+00 0.0000E+00 1.0000E+00 -1.100E+01 9.7000E+01 0.0000E+00 0.0000E+00 1.0000E+00 0.0000E+00 1.4200E+02 0.0000E+00 0.0000E+00 3.6621E-04 0.0000E+00 1.4300E+02 0.0000E+00 0.0000E+00 3.7396E-03 -7.311E-01 1.4400E+02 0.0000E+00 0.0000E+00 2.1909E-03 -6.536E-01 1.4500E+02 0.0000E+00 0.0000E+00 3.3159E-03 -1.755E+01 1.6600E+02 0.0000E+00 0.0000E+00 3.0674E-03 -7.090E-02 1.5200E+02 8.9244E-13 -4.808E-08 2.9788E-03 4.0947E+00 2.0500E+02 8.3276E-13 -4.520E-08 2.9456E-03 4.2246E+00 1.5400E+02 5.2296E-13 -1.526E-08 2.1861E-03 1.0148E+01 1.5600E+02 0.0000E+00 0.0000E+00 1.4963E-03 0.0000E+00 1.5700E+02 0.0000E+00 0.0000E+00 1.4963E-03 0.0000E+00 1.4600E+02 0.0000E+00 0.0000E+00 2.1011E-03 8.2000E-03 1.4700E+02 0.0000E+00 0.0000E+00 5.2708E-03 -5.915E-01 1.4800E+02 0.0000E+00 0.0000E+00 2.1013E-03 -2.750E-02 1.4900E+02 0.0000E+00 0.0000E+00 5.2379E-03 2.1010E-01 1.5000E+02 0.0000E+00 0.0000E+00 2.4403E-02 2.5151E+02 1.5100E+02 0.0000E+00 0.0000E+00 5.0352E-03 -2.083E-01 1.7400E+02 0.0000E+00 0.0000E+00 2.4408E-02 2.5003E+02 1.7500E+02 0.0000E+00 0.0000E+00 5.0400E-03 5.7000E-03 1.7600E+02 0.0000E+00 0.0000E+00 1.0546E-02 -1.823E+00 1.5800E+02 0.0000E+00 0.0000E+00 2.1073E-03 -7.272E-01 1.5900E+02 0.0000E+00 0.0000E+00 2.1018E-03 -9.610E-02 1.6000E+02 0.0000E+00 0.0000E+00 5.2702E-03 3.2220E-01 1.6200E+02 0.0000E+00 0.0000E+00 1.5224E-03 -9.940E-02 1.6300E+02 0.0000E+00 0.0000E+00 3.7277E-03 1.6070E-01 1.6400E+02 0.0000E+00 0.0000E+00 5.1879E-03 -2.066E-01 1.9000E+02 0.0000E+00 0.0000E+00 3.0518E-03 0.0000E+00 1.9100E+02 0.0000E+00 0.0000E+00 3.0518E-03 0.0000E+00 1.9200E+02 0.0000E+00 0.0000E+00 3.0518E-03 0.0000E+00 -1.500E+02 0.0000E+00 -2.280E-01 2.9350E-02 0.0000E+00 -1.510E+02 0.0000E+00 9.8043E-01 0.0000E+00 0.0000E+00 -1.740E+02 0.0000E+00 -2.527E-01 -1.026E-02 0.0000E+00 -1.750E+02 0.0000E+00 1.0294E+00 0.0000E+00 0.0000E+00 -1.760E+02 0.0000E+00 1.0302E+00 0.0000E+00 0.0000E+00 -1.450E+02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.660E+02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.460E+02 0.0000E+00 6.2500E+00 1.0260E+00 0.0000E+00 -1.480E+02 0.0000E+00 7.5414E+00 3.5000E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 3.2.3 TYPE 3 - CONVERTED DATA TRANSFORMATION RECORD WORD PARAMETER --------------------------------------- 1. TYPE (3) 2. NUMBER OF WORDS IN RECORD (192) 3. WORD ADDRESS IN TYPE 5 RECORD 4. DIVISOR 5. WORD ADDRESS 6. DIVISOR ETC. Y = X(WORD ADDRESS) / DIVISOR CONTENTS OF RECORD 3 3 192 12 1 13 10 14 1 15 10 16 1 17 10 18 10 19 10 20 10 21 10 22 10 23 10 24 10 25 10 26 10 27 10 28 10 29 10 30 10 31 10 32 10 33 10 34 10 35 1 36 10 37 10 38 10 39 10 40 1 41 1 42 10 43 1 44 10 45 1 46 10 47 10 48 10000 49 10000 50 10 51 10 52 10 53 10 54 10 55 10 56 10 57 10 58 10 59 10 60 10 61 100 62 100 63 10 64 10 65 10 66 10 67 10 68 10 69 1000 70 1000 71 1 72 100 73 100 74 100 75 1 76 1 77 0 78 0 79 0 80 10 81 10 82 10 83 0 84 0 85 0 86 0 87 0 88 0 89 0 90 0 91 0 92 0 93 0 94 0 95 0 96 0 97 0 98 0 99 0 100 0 101 0 102 0 103 0 104 0 105 0 106 0 3.2.4 TYPE 4 - ORIGINAL DATA RECORD ------------------------------------------------------------------ N43RF 222 WORD TYPE 4 RECORD SALLJEX 2003 ------------------------------------------------------------------ The type 4 record contains raw data from the AOC slow tape. The data are recorded as 16 bit HP words. Most of the data is recorded as integer counts and must be converted to volts and then to mean- ingful units by using the type 2 record. All of the navigation data is stored in a special format, and can only be read by performing special bit shifting operations. If examination of the raw navigation data is desired, ask AOC for a copy of the bit shifting subroutine called PACK. Beginning with the 2000 Hurricane Season, locations 32-38 contain GPS data from the ASHTECH BR2G system (BR2G prefix). Array Location Description ----------------------------------------------------------------------- 1 Type of record (4) 2 Number of words in record (222) 3 MS byte: Slow tape ID LS byte: Aircraft # 4 Size of slow tape logical record = 220 5-10 Micro 99 time - yr,mo,da,hr,mn,sc 11-13 Time based generator 1 - hr,mn,sc; binary (not BCD) 14-16 Time based generator 2 - same as TBG 1 17-19 Collins GPS time of fix - hr, min,sec; same as TBG's 20-21 Collins GPS altitude - MS bit = -102400*32 ft 22-23 Collins GPS latitude - MS bit = -PI*4 radians 24-25 Collins GPS longitude - MS bit = -PI*4 radians 26-27 Collins GPS north vel. - MS bit = -1638.4*2 knots 28-29 Collins GPS east vel. - MS bit = -1638.4*2 knots 30-31 Collins GPS vert. vel. - MS bit = -2048*2 ft/sec 32 BR2G GPS Data Time; 0 - 36000, lsb= 1/100 sec 33 BR2G GPS Altitude; +/- 32767, lsb= 1 foot 34-35 BR2G GPS Latitude; msb= -PI*4 radians 36-37 BR2G GPS Longitude; msb= -PI*4 radians 38 BR2G GPS Status and Horiz. Dilution of Precision bits 15,14: 00 - no position, 01 - uncorrected 10 - diff corrected, 11 - almanac used bits 13,8: # of satellites used, ls byte- HDOP 00 - 99 39 Spare 40 Collins GPS north accel. - MS bit = -128 m/s**2 41 Collins GPS east accel. - MS bit = -128 m/s**2 42 Collins GPS vert. accel. - MS bit = -128 m/s**2 43 Collins GPS Ch. 1 Status 1 44 Collins GPS Ch. 1 Status 2 45-52 Collins GPS Ch. 2-5 Status - same format as Ch. 1 53 Collins GPS Figure of Merit (FOM) word Note: Time FOM from word 64 is in reserved bits (12,11,5,4 in HP notation; 3,4,10,11 in Collins notation) 54 Collins GPS expected horiz. error - ls bit- 1 meter 55 Collins GPS expected vert. error - ls bit- 1 meter LS byte - count starting at array location 41. 56 Spare 57-58 INE 1 Altitude - MS bit = -102400*32 ft 59-60 INE 1 Latitude - MS bit = -PI*4 radians 61-62 INE 1 Longitude - MS bit =-PI*4 radians 63-64 INE 1 North Vel. - MS bit = -1638.4*2 knots 65-66 INE 1 East Vel. - MS bit = -1638.4*2 knots 67-68 INE 1 Vert speed - MS bit = -2048*2 ft/sec 69-70 INE 1 Drift Angle - MS bit = -PI*4 radians 71-72 INE 1 Heading - MS bit = -PI*4 radians 73-74 INE 1 Pitch Angle - MS bit = -PI*4 radians 75-76 INE 1 Roll Angle - MS bit = -PI*4 radians 77-96 INE 2 Data - Same as INE 1 97 APN 232 RA data in meters; 1 sec avg 98 Spare; 1 sec avg 99 Spare; 1 sec avg 100 RA - APN159 Synchro data in meters; 1 sec avg 101 RA - APN159 digital encoder in meters 102 # of INE bursts av'd this sec; MS byte:INE 1 LS byte:INE 2 103 GPS and APN232 RA burst count; ms nybble - GPS lat/lon/alt burst count, 2ND nyble - GPS velocity east/north/vert burst count, LS byte - APN232 RA number of words averaged this second. 104 # of ISEC word 98 and 99 samples avg this second; ms byte- ISEC(98), ls byte- ISEC(99) 105 Dig_Err: Error flags for Dig. Avg; bit 0 for APN232 106 Spare 107 ADC unit status - from ADC slow data burst 108 IAU unit status - from IAU burst 109 Operator selections: MS nybble - temp probe nybble 2 - nav. unit nybble 3 - alt. source 110 Status from Wing Wiring Junction Box 111 Status from Cloud Physics Station 112 Status from Flight Director Station 113 Spare 114 Event switch data - Nav, Sta1, Sta2, Sta3 115 Event switch data - Nrack, Sta5, C3X, Sta7 116 Event switch data - F/D, Pilot 117 118 119 Formvar count 120 Formvar speed 121 122-140 Spare 141 M29 10 msec tic when time was read - use for clock drift tracking. 142 J-W Liquid water 143 RMST TOTAL TEMP #1 144 RMST TOTAL TEMP #2 145 Dew Point 1 (DW1) GENERAL EASTERN 146 AP Alpha (attack) Pressure 147 DAP Differential Alpha Pressure 148 BP Beta (slip) Pressure 149 DBP Differential Beta (slip) pressure 150 PSW Rosemount static pressure from wingtip(#1281) 151 PQW Rosemount dynamic pressure from win#tip(#1281) 152 RD Radiometer Down measures SST (PRT-5) 153 154 RS Side (CO2) radiometer temperature 155 156 Vertical Acceleration 2 157 Vertical Acceleration 1 158 RADOME ATTACK PRESSURE 159 RADOME SIDESLIP PRESSURE 160 RADOME DIFF. PRESSURE (RPQ) 161 RADOME IMPACT PRESSURE 162 Spare 163-165 Spare 166 DEWPOINT #2 (DW2) Edge Tech 137 167 Spare 168 Spare 169 DEWPOINT #3 (DW3) Buck Research 1011C 170 DEWPOINT BALANCE (DW3) Buck Research 1011C 171-172 Spare 173 King Liquid water 174 PSF - COPILOT ROSEMOUNT #1281 (FUSELAGE) 175 PQF1 - COPILOT ROSEMOUNT #1281 (FUSELAGE) 176 PQF2 - COPILOT ROSEMOUNT #1221F(FUSELAGE) 177 TT1 Heater Current 178 TT2 Heater Current 179-188 Spare 189 Spare 190 Spare 191 Spare 192 Spare 193 Eppley Up Pyranometer 1 (yellow) 194 Eppley Up Pyranometer 2 (Red) 195 Eppley Up Pyranometer 3 (Clear) 196 Up Pyrgeometer 197 Up Pyrgeometer Case Temp 198 Up Pyrgeometer Dome Temp 199 Down Pyranometer 1 (Yellow) 200 Down Pyranometer 2 (Red) 201 Down Pyranometer 3 (Clear) 202 Down Pyrgeometer 203 Down Pyrgeometer Case Temp 204 Down Pyrgeometer Dome Temp 205 Up PRT-5 Radiometer 206 Spare 207 Spare 208 Spare 209 Spare 210 Spare 211 Spare 212 Spare 213 Spare 214 Spare 215 Spare 216-221 Spare 222 Checksum for this second 3.2.5 TYPE 5 - CONVERTED/DERIVED DATA RECORD April 10, 2003 DATA RECORD TYPE 5 (SALLJEX 2003) WORD SYM PARAMETER WORD SYM PARAMETER 1 TP TYPE(5) 26 HD HEADING (TRUE) 2 WD NO. WORDS/RECORD 27 PC PITCH 3 HR HOUR 28 RL ROLL 4 MN MINUTE 29 AA ATTACK ANGLE 5 SC SECOND 30 SA SLIP ANGLE 6 RC1 RECORD COUNT 31 J-W LIQ. WATER 7 RC2 RECORD COUNT 32 PQ DYNAMIC PRESSURE 8 SW1 SWITCHES 33 TD DEWPOINT TEMPERATURE 9 SW2 SWITCHES 34 RU RADIOMETER UP (IF AVAIL) 10 FL1 ERROR FLAGS 35 SW3 SWITCHES 11 FL2 ERROR FLAGS 36 UTAIL E/W VELOCITY OF TAIL 12 Xla1 LATITUDE (DEG) 37 VTAIL N/S VELOCITY OF TAIL 13 Xla2 LATITUDE (MIN) 38 WTAIL VERT VELOCITY OF TAIL 14 Ylo1 LONGITUDE (DEG) 39 15 Ylo2 LONGITUDE (MIN) 40 GA GEOPOTENTIAL ALT. (METER) 16 Ralt RADAR ALTITUDE (METER) 41 PALT PRESSURE ALT. (METER) 17 PS PRESSURE 42 DV D-VALUE 18 TA AMBIENT TEMPERATURE 43 HT HEIGHT STANDARD WORD SYM PARAMETER WORD SYM PARAMETER 19 TW1 DEWPOINT SENSOR 44 SP SURFACE PRESSURE 20 RD RADIOMETER DOWN 45 RH RELATIVE HUMIDITY 21 RS RADIOMETER SIDE 46 TV VIRTUAL TEMPERATURE 22 GS GROUND SPEED 47 WAS VERTICAL AIRSPEED 23 TS TRUE AIRSPEED 48 GM RATIO SPECIFIC HEATS 24 WGS VERT. GROUND SPEED 49 AMA MACH NUMBER 25 TK TRACK 50 DA DRIFT 51 GSX E/W GROUND SPEED 67 WSB AVERAGE WIND SPEED 52 GSY N/S GROUND SPEED 68 WDB AVERAGE WIND DIR 53 TX E/W TRUE AIRSPEED 69 AV1 VERTICAL ACCELEROMETER #1 54 TY N/S TRUE AIRSPEED 70 AV2 VERTICAL ACCELEROMETER #2 55 WX E/W WIND SPEED 71 WAC SEC. WIND AVERAGED OVER 56 WY N/S WIND SPEED 72 BT1 AXBT1 57 WZ VERTICAL WIND SPEED 73 BT2 AXBT2 58 WS WIND SPEED 74 BT3 AXBT3 59 WD WIND DIRECTION 75 NAV 1 = INE 1 2 = INE 2 60 EW SAT. VAPOR PRES 76 ITMP TOTAL TEMP USED: 1 OR 2 61 EE VAPOR PRESSURE 77-78 NOT USED 62 MR MIXING RATIO 79 KING LIQ. WATER VOLTAGE 80 DPJ's VERT GRND SPEED 63 PT POTENTIAL TEMP 81 DPJ's VERT AIR SPEED 64 ET EQUIVALENT POT.TEMP. 82 DPJ's VERT WIND 65 WXB E/W AVERAGE WIND 83-106 NOT USED 66 WYB N/S AVERAGE WIND PLEASE NOTE: THE WORDS ARE 16 BITS LONG THE RECORD LENGTH IS 106 WORDS THE BLOCK LENGTH IS 10 RECORDS...10 x 106 = 1060 WORDS WORDS 6 AND 7 ARE RECORD COUNTS TOTAL COUNT=RC1+RC2 WORDS 8,9,35 ARE EVENT SWITCHES HIGH ORDER BIT OF WORD 8 IS SWITCH 1 WORDS 78 THRU 106 ARE BLANK EXCEPT FOR HURRICANE TAPES WORDS 10 AND 11 ARE ERROR FLAGS FLAG 1 IS IN HIGH ORDER BIT OF WORD 10. IF THE BIT IS ON, A 1 INSTEAD OF A 0, THE DATA MAY BE IN ERROR. THE FOLLOWING IS A LIST ASSOCIATING AN ERROR FLAG TO A PARAMETER: FLAG 1 TIME FLAG 11 TRUE AIRSPEED 2 LATITUDE 12 VERTICAL SPEED 3 LONGITUDE 13 TRACK 4 RADAR ALT 14 HEADING 5 AMBIENT PRESS 15 PITCH 6 AMBIENT TEMP 16 ROLL 7 DEWPOINT TEMP 17 ATTACK ANGLE 8 DOWN RADIOMETER 18 SLIP ANGLE 9 SIDE RADIOMETER 19 LIQUID WATER 10 GROUND SPEED 20 DYNAMIC PRESS 3.2.6 TYPE 6 - TRAILER RECORD WORD PARAMETER ------------------------------------- 1. TYPE OF RECORD (6) 2. NUMBER OF WORDS IN RECORD (15) 3. NOT USED 4. TOTAL LENGTH OF FLIGHT IN SECONDS (UP TO 32677 SECONDS) 5. NUMBER OF SECONDS FLIGHT LASTS PAST 32677 SECONDS 6. HOUR TAKE OFF TIME 7. MINUTE " " " 8. SECOND " " " 9. HOUR BEGINNING OF REEL (BLOCK OUT TIME) 10. MINUTE " " " 11. SECOND " " " 12. HOUR END TIME OF REEL (BLOCK IN TIME) 13. MINUTE " " " " 14. SECOND " " " " 15. LAST REEL? (1=YES, 0=NO) 4.0 Quality Control This data is provided as-is. No quality control has been performed on this data by the University Corporation for Atmospheric Research/Joint Office for Science Support (UCAR/JOSS). 5.0 References All documentation were provided via personal communication from NOAA/AOC.