TM 1-1510-218-10 3-69 TRI+6 FP 7 ESA 13800FT LUBBOCK CL C A-637 ALRT Figure 3-95.  TRI 6 Page be.  The   Calculator   Pages.       There   are   seven calculator   pages   that   may   be   used   to   calculate   a variety  of  information  such  as  pressure  altitude  and density   altitude,   true   airspeed,   winds   aloft,   VNAV angle,  and  time  zone  conversions.    The  calculator pages  rely  on  manual  inputs  of  air  data  parameters even if the KLN 90B is interfaced with air data sensors. (1)   The Calculator 1 Page.  The CAL 1 page is  used  to  determine  pressure  altitude  and  density altitude. NOTE If the AETMS is installed and interfaced to the  KLN  90B,  the    OTH   10   page   displays pressure  altitude  and  density  altitude  for the present conditions.  1.   Display  the  CAL  1  page  on  the  left side. 2.   Press the left  CRSR button to turn on the left cursor function. 3.   Enter   the   altitude   indicated   on   the aircraft  altimeter  (IND)  to  the  nearest hundred  feet  by  using  the  left  outer knob to move the cursor to the desired position   and   the   left   inner   knob   to select each digit. 4.   Use  the  left  outer  knob  to  move  the cursor  to  the  first  BARO  position,  and then enter the current altimeter setting by    using    the    left    inner    and    outer knobs.  The pressure altitude (PRS) is now displayed. 5.   Use  the  left  outer  knob  to  move  the cursor to the first  TEMP position, and then enter the outside air temperature (in   °C)   by   using   the   left   inner   and outer   knobs.      The   first   digit   of   the temperature    is    either    zero    if    the temperature  is  above  zero  or  a  minus (–)  if  the  temperature  is  below  zero.   For  maximum  accuracy,  the  static  air temperature should be entered.  Static air   temperature   is   the   temperature without   the   effect  of  heating  due  to movement    through    the    air.        The density altitude (DEN) is now displayed as illustrated in Figure 3-96. 6.   Press the left  CRSR button to turn off the left cursor function. CAL 1   ALTITUDE IND:04000FT BARO:29.84” PRS  4100FT TEMP: 034^o C DEN  7100FT Figure 3-96.  CAL 1 Page (2)   The Calculator 2 Page.  The CAL 2 page is used to determine TAS. NOTE If the AETMS is installed and interfaced to the KLN 90B, the OTH 9 page displays the TAS for the present conditions.  1.   Select the CAL 2 page on the left side. 2.   Press the left  CRSR button to turn on the cursor function. 3.   Enter the aircraft's  calibrated airspeed by    using    the    left    inner    and    outer knobs.      If   calibrated   airspeed   isn't known, use the indicated airspeed. 4.   Use  the  left  outer  knob  to  move  the cursor  to  the  first  ALT  position,  and then  enter  the  indicated  altitude  using the  left  inner  and  outer  knobs.    If  the indicated altitude was previously entered   on   the   CAL   1   page,   it   will already be displayed.