4
Defi nitions
The following is a list of abbreviations and acronyms commonly used by military jumpmasters that also relate specifi cally to this accessory:
AGL
Above Ground Level
Altitude measure
CD
Canopy Drift
drift while parachute is open
DIP
Desired Impact Point
location where landing should occur
DZ
Drop Zone
area where landing should occur
DZSTL
Drop Zone Support Team Leader
LFFD
Free Fall Drift
drift before parachute is open
HAHO
High Altitude High Opening type of jump
HALO
High Altitude Low Opening
type of jump
HARP
High Altitude Release Point
location jumper exits from aircraft
MSL
Mean Sea Level
Altitude measure
NOAA
National Oceanographic & Atmospheric Administration
PRP
Primary Release Point
HARP plus forward throw of aircraft
The following list of additional terms are often used by jumpmasters:
Drop Altitude
Altitude when jumpmaster exits aircraft, measured in AGL
Forward Throw
Horizontal distance traveled by due to aircraft speed
HAHO Jump
Type of jump where the jumpmaster jumps from a very high altitude and opens chute at a high altitude
HALO Jump
Type of jump where the jumpmaster jumps from a very high altitude and opens chute at a low altitude
K values
Wind drag values for parachutes
Opening Altitude
Altitude when jumpmaster opens chute, measured in AGL
Static Jump
Type of jump where wind speed and direction are assumed constant for the duration of the jump
The following “typical” example is used in jumpmaster training courses. While the solution to this problem is outside the scope of this document, this
example is included to give an idea of the capabilities of the Jumpmaster accessory.
EXAMPLE:
HALO JUMP
The exit altitude is 14,000 feet. The jumpmaster wants 1,000 feet for canopy assembly and a 1,000-foot arrival altitude over the DZ.
Winds are as follows:
Altitude
Velocity
Direction
14000
25
090
12000
22
080
10000
21
090
9000
21
090
8000
20
085
7000
18
080
6000
18
080
5000
17
085
4000
16
080
3000
12
075
2000
12
080
1000
8 080
The jumpmaster plans a course to the HARP at 235 degrees at 300 feet forward throw. Given the coordinate for the DIP, calculate the HARP.
