TM 1-1510-225-10 3D-58 f.    The  Air  Data  Pages.    When  interfaced  with the AETM, the KLN 90B will display real time air data parameters  such  as  True  Airspeed  (TAS),  Static  Air Temperature    (SAT),    Total    Air    Temperature    (TAT), Mach  number,  density  altitude,  and pressure altitude.   The KLN 90B will also calculate and display real time wing data (magnitude and direction).  The  OTH 9 and OTH 10 pages are used to display air data information.    (1)   Figure   3D-79  depicts  the  OTH  9  page display. OTH 9 AIR DATA TAS   265KT MACH    .41 HDWND  30KT WIND  078^ot        32KT Figure 3D-79.  OTH 9 Page NOTE These  air  data  pages  receive  inputs  from air  data  sensors  and  display  real  time  air data information.  They are independent of the  calculator  pages  that  rely  on  manual pilot inputs to calculate air data information. (a)   The  TAS  of  the  aircraft  through  the surrounding air mass. (b)   MACH  – the ratio of the true airspeed to the speed of sound at a particular flight condition. (c)   The Tailwind (TLWND) component of the wind, if applicable. (d)   The    (HDWND)    component    of    the wind, if applicable. (e)   The Wind (WIND) direction relative to true North and the wind speed. (2)   OTH    10    Page.        The    OTH    10    page displays the following information. (a)   SAT  –  the  actual  temperature  of  the surrounding air. (b)   TAT  –  the  air  temperature  including heat    rise    due    to    compressibility.        This    is    the temperature measured directly by the OAT probe. (c)   Pressure altitude (PRS) to the nearest 100 feet. (d)   Density altitude (DEN) to the nearest 100 feet. 3D-24.  THE SETUP PAGES. a.   The Setup 0 Page. The SET 0 page is used for    computer    updating    of    the    database.        Update information  is  sent  on  3.5-inch  disks.    A  computer  is used    via    the    data    loader    jack    installed    in    the instrument   panel.      This   is   normally   a   maintenance function. CAUTION The     KLN     90B     does     not     perform     any navigation functions while the database is being uploaded. NOTE The disks can only  be used to update one KLN   90B,   although   they   can   be   used   to update   a   specific   unit   numerous   times.   The   first   time   the   disks   are   used   in   an update  operation,  a  unique  identification code   from   the   KLN   90B   being   used   is uploaded to the disks.  These disks may be used in this specific KLN 90B an unlimited number  of  times  if  switching  between  the North    American    and    International    data- bases   occurs   during   one   update   cycle.   These  disks,  however,  may  not  be  used  to update    other    KLN    90B's.        This    update protection ensures that Jeppesen Sanderson   is   properly   compensated   for their NavData™. b.  The  Setup  1  Page.     The  Setup  1  page  is used  to  manually  update  the  position  of  the  KLN  90B and enter a groundspeed for use of the KLN 90B in the take  home  mode.    Refer  to  Figure  3D-80.  Since the KLN    90B    stores    its    position    and    other    required parameters   in   memory   when   power   to   the   unit   is removed,   it   is   seldom   necessary   to   aid   the   unit   in reaching  a  NAV  ready  status.    In  order  for  the  unit  to reach  a  NAV  ready  condition,  it  is  necessary  to  meet the   same   conditions   outlined   in   Paragraph   3D-7, Initialization.