TM 1-1510-224-10 Altimeter Setting ..................................... 30.07 in.  Hg Wind .................................................. 290 at 15 knots Runway 34 Length......................................5585 feet¹ Gradient ................................................ 9% downhilll^{1 1}Source: DOD TERM USLIAAPVO1, 9 JAN 92. Route of Trip: BIL - V19 - CPR Route Segment Data: Table 7-1. At Natrona County International (CPR): Free Air Temperature.......................................... 68F Field Elevation ............................................5348 feet⁴ Altimeter Setting ..................................... 29.27 in.  Hg Wind .................................................330 at 10 knots Runway 30 Length......................................8686 feet⁴ Gradient ...................................................... 0.3% up^{4 4}Source: DOD TERM USLIAPV03, 9 JAN 92. b. Fahrenheit  to  Celsius  Temperature  Conversion. Convert reported field temperatures at the departure and destination airports from Fahrenheit to Celsius using the Fahrenheit   to   Celsius   Temperature   Conversion   graph (fig.    7-9).    Enter  the  chart  at  the  appropriate  value  on the F scale, read up to the reference line and left to the corresponding value in  C. Billings-Logan International 59F...................... 15C Natrona County International 68F ................... 20C c. Pressure Altitude. To determine the approximate  pressure  altitudes  at  origin  and  destination airports, add 1000 feet to field elevation for each 1.00 in. Hg   that   the   reported   altimeter   setting   value   is   below 29.92  in.    Hg,  and  subtract  1000  feet  for  each  1.00  in. Hg  above  29.92  in.    Hg.    Always  subtract  1000  feet  for each 1.00 in.  Hg above 29.92 in.  Hg, then multiply the answer by 1000 to find the difference  in  feet  between  field  elevation  and  pressure altitude. Pressure Altitude at BIL: 29.92 -30.07 -0.15 -0.15 x 1000 feet = -150 feet Field Elevation ............................................. 3649 feet Pressure Altitude Correction ..........................-150 feet Field Pressure Altitude ................................. 3499 feet Pressure Altitude at CPR: 29.92 -29.27 +0.65 0.65 x 1000 feet = 650 feet Field Elevation ............................................. 5348 feet Pressure Altitude Correction ......................... +650 feet Field Pressure Altitude ................................. 5998 feet d. Wind   Components.      Determine   the   headwind (tailwind)   and   crosswind   component   for   the   selected runway.    Compute  the  angle  between  the  reported  wind at  Billings-Logan  International  of  290  and  the  selected runway  heading  of  340  to  be  50.    Locate  the  line  for 50  angle  between  wind  direction  and  flight  path  on  the graph.  Trace along the 50 line and locate the reported wind  speed  of  15  knots  (the  point  midway  between  the 10  and  20  knot  wind  speed  lines).    Read  left  to  obtain the    headwind    component    and    down    to    obtain    the crosswind component. Headwind Component ................................... 10 knots Crosswind Component .................................. 12 knots Table 7-1.  Route Segment Data2 ROUTE SEG- MENT AVERAGE MAGNETIC COURSE AVERAGE MAGNETIC VARIATION DIS- TANCE NM WIND AT FL 250 DIR.IKNOTS FAT AT FL 250 °C MEA FEET FAT AT MEA °C ALTIMETER SETTING IN.  HG BIL-SHR 117 15E 91³ 010/45 -40 8000 0 29.97 SHR-CZI 139 14E 57 35065 -40 9000 -4 29.60 CZI-CPR 161 13E 69³ 310/50 -30 7600 0 29.48 ²Source: DOD Low Altitude Enroute Chart L-9, 9 Jan 1992. ³Includes distance between airport and VORTAC, per DOD US IFR SUPPLEMENT, 9 JAN 1992. BT06334 7-10