21212  indicator  group  is  not  included.  Winds  are encoded  in  sets  of  three  fixed  levels,  from  lower  to higher.  Each  set  is  preceded  by  an  identifier  group 9t_nu₁u₂u₃   or   8t_nu₁u₂u₃.   Identifier   groups   beginning with a 9 are used when the fixed levels are separated by 300  meter  (1,000  foot)  increments,  as  used  in  WMO Region IV. An indicator "1" replaces the indicator "9" when the heights exceed 30,000 meters (100,000 feet). The  "8"  indicator  means  that  the  fixed  levels  are separated by 500-meter increments. The t_n is the tens digit of the first altitude reported in the set; the u₁, u₂ and u₃ are the units digits of the level number. Essentially, as used by the United States, t_n is the ten-thousands value of the altitude in feet, and the u₁, u₂. and u₃ are the thousands value of the altitude in feet. For example, "91246 27575 27090 26606" indicates winds for the 12,000 foot (MSL), 14,000-foot (MSL), and the 16,000-foot (MSL) fixed regional levels, respectively, as 275° at 75 knots, 270° at 90 knots, and 265° at 106 knots.  Refer  to  table  1-5  for  a  listing  of  the  fixed regional levels used in WMO Region IV. Regional Codes Regional  codes  may  be  added  to  the  report following  the  "51515"  through  "59595"  group  and national  codes  from  "61616"  through  "69696"  indicator group,  as  appropriate.  In  WMO  Region  IV,  only  the 51515  group  is  used.  The  Additional  Data  Codes  or 101-groups,  as  discussed  previously,  may  be  added when encoding a Pibal observation. The indicator and the 101 -groups are not included when using the PILOT code Part B (or Part D) to report fixed regional level winds  observed  during  a  rawinsonde  observation,  since this  would  duplicate  information  previously transmitted. PART C - UPPER MANDATORY LEVELS Part C of the PILOT code is formatted exactly as Part A. Only the mandatory levels above the standard altitude of the 100-hPa level are reported in Part C. PART D - UPPER SIGNIFICANT LEVELS Significant  level  winds  or  fixed  regional  level winds for the levels higher than the 100-hPa level are reported in Part D. The format is exactly the same as Part B. REVIEW  QUESTIONS Q63. What information is contained in Part A of the PILOT code? Q64. Q65. Q66. Q67. Q68. Q69. What  does  the  indentifier  EEBB  of  the  PILOT code  indicate? How  would  the  information  "44370  33030 35565  32082"  be  decoded  from  Part  A  of  a PILOT coded message? The  group  77P_mP_mP_m  is  used  to  indicate  what information in a PILOT coded message? What is the minimum wind speed required for a wind level to be classified as a maximum wind? When  reporting  fixed  regional  level  winds  in Part  B  of  the  Pilot  Code.  how  would  "90346 09012 10015 12520" be decoded? What information is contained in Part D of the PILOT code? OBSERVATION  RECORDS LEARNING   OBJECTIVES:   Identify   the records  that  must  be  maintained  by  upper-air observers,  and  explain  the  proper  disposition  of these  records. SECNAVINST  5212.5,  the  Navy  and  Marine Corps   Records   Disposition   Manual,   identifies meteorological records, such as upper-air observations (except   those   conducted   only   for   training),   as permanent official records of the U.S. Government. As such, the original sounding records must be forwarded to  FNMOD.  Asheville,  North  Carolina,  at  the  end  of each  month  in  accordance  with  NAVMET- O C C O M I N S T   3 1 4 0 . 1 ,   U n i t e d   S t a t e s   N a v y Meteorological  and  Oceanographic  Support  System Manual.   Duplicate  copies  of  sounding  records  are temporary records that may be retained on board as long as they are useful, normally 1 year, and then destroyed. PAPER RECORDS When an upper-air sounding is conducted by using the MRS. the sounding records are considered to be the original printouts of the raw data, the printouts of the mandatory  and  significant  levels  (LIST),  and  the printout of the coded message (TEMP), including any operator  entered  data.  The  printout  should  be  neatly folded  in  standard  page  size  (8.5  by  11  inches)  and mailed  in  a  large  envelope.  DO  NOT  separate  the continuous  feed  printer  paper  into  individual  sheets. Each  sounding  printout  should  be  arranged  in chronological  order  and  identified  with  complete 1-31