TM 10-1670-265-12&P
T.O. 13C7-1-21
2-7. Setting altitude. Set sensor as follows:
a. Determine drop zone elevation. (Example: Drop zone elevation of 400 ft.)
b. Add 1900 ft. to drop zone elevation. This will allow 800 ft. for altitude loss during parachute opening and
additional 600 ft. to- sensor location error and 500 ft. safety factor. (Example: 400 ft. + 1900 ft. = 2300 ft.)
c. Set the total of a. and b. (400 + 1900 ft. = 2300 ft.) on the sensor dials.
Example:
Set arrow of FT x 1000 dial to 2.
Set arrow of FT x 100 dial to 3.
d. Set BARO. PRES. arrow to the forecasted barometric pressure at drop zone at the time of the airdrop. Table 2-3
provides the proper setting.
TABLE 2-3. BAROMETRIC PRESSURE SETTING
Barometric Pressure is:
Set BARO. PRES. to:
29.54 or below...................................................................
29.5
29.55 -29.64 ......................................................................
29.6
29.65 -29.74 ......................................................................
29.7
29.75 -29.84 ......................................................................
29.8
29.85 -29.94 ......................................................................
29.9
29.95 - 30.04 .....................................................................
30.0
30.05 - 30.14 .....................................................................
30.1
30.15-30.24 .......................................................................
30.2
30.25 - 30.34 .....................................................................
30.3
30.35 or higher ..................................................................
30.4
2-7
