Setting altitude

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