JP 3-50 National Search and Rescue Manual Vol I - US Navy
JP 3-50 National Search and Rescue Manual Vol I - US Navy JP 3-50 National Search and Rescue Manual Vol I - US Navy
B. Parachute Drift (dp) is the combination of parachute glide ratio and displacement due to winds aloft. Opening altitude, parachute type, and glide ratio, as well as average winds aloft and terrain height, should be considered when computing dp. 1. Most U.S. military parachutes automatically deploy at 14,000 feet, while Canadian Defence Force parachutes deploy at 16,400 feet. Some aircraft which operate regularly over mountains set automatic opening devices for 2,000 feet above the highest mountain peak in the operating area. The parent agency should be contacted to determine specific parachute characteristics. 2. If parachute opening altitude is not available, SMCs should assume: a. Military parachutes open at 14,000 feet, or at bailout altitude if below 14,000 feet. b. Civilian parachutes open at bailout altitude, or if below 14,000 feet, at ATC-assigned altitude. For situations mandating descent, such as engine failure, calculations should make allowance for loss of altitude before bailout. Parent agency policy on minimum engine restart altitude (PARACHUTE OPENED AT 8000 FEET OVER OCEAN) Figure 5-4. Average Winds Aloft Example
TABLE 5-1. Parachute Drift Distance (Zero Glide Ratio) (Distance in miles of landing positions downwind from position of parachute opening) Wind in Knots Parachute-Opening Height 10 20 30 40 50 60 70 30,000 ft. (9,000m) 3.7 7.4 11.1 14.7 18.4 22.1 25.8 20,000 ft. (6,000m) 2.7 5.3 8.0 10.7 13.3 16.0 18.7 14,000 ft. (4,300m) 1.9 3.8 5.7 7.7 9.5 11.4 13.3 10,000 ft. (3,050m) 1.4 2.8 4.2 5.7 7.0 8.3 9.7 8,000 ft. (2,400m) 1.2 2.3 3.5 4.6 5.8 6.9 8.1 6,000 ft. (1,800m) .9 1.7 2.6 3.5 4.4 5.2 6.1 4,000 ft. (1,200m) .6 1.2 1.8 2.4 3.0 3.5 4.1 2,000 ft. (600m) .3 .6 .9 1.2 1.5 1.8 2.1 5-5
- Page 73 and 74: the potential for recording data wi
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- Page 105 and 106: Figure 4-1. Water Chill Without Ant
- Page 107 and 108: s Figure 4-2. Wind Chill Graph - Eq
- Page 109 and 110: 445 Weather A. Weather may limit SA
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- Page 113 and 114: 471 PRECOM A. PRECOM search contact
- Page 115 and 116: the objective during their normal o
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- Page 129 and 130: B. Sea Current (SC) is the residual
- Page 131 and 132: Figure 5-6A. Wind Current - North L
- Page 133 and 134: large lake can vary with season, we
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- Page 137 and 138: 520 SEARCH AREA Figure 5-8. Minimax
- Page 139 and 140: Figure 5-9. Drift Error by Minimax
- Page 141 and 142: DRe to determine SRU error (Y = Fix
- Page 143 and 144: Figure 5-11. Search Areas - Moving
- Page 145 and 146: E. When only a datum area exists, s
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- Page 153 and 154: TABLE 5-6. Visual Sweep Width Estim
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B. Parachute Drift (dp) is the combination of parachute glide<br />
ratio <strong>and</strong> displacement due to winds aloft. Opening altitude, parachute<br />
type, <strong>and</strong> glide ratio, as well as average winds aloft <strong>and</strong> terrain<br />
height, should be considered when computing dp.<br />
1. Most U.S. military parachutes automatically deploy at 14,000<br />
feet, while Canadian Defence Force parachutes deploy at 16,400<br />
feet. Some aircraft which operate regularly over mountains<br />
set automatic opening devices for 2,000 feet above the highest<br />
mountain peak in the operating area. The parent agency should<br />
be contacted to determine specific parachute characteristics.<br />
2. If parachute opening altitude is not available, SMCs should<br />
assume:<br />
a. Military parachutes open at 14,000 feet, or at<br />
bailout altitude if below 14,000 feet.<br />
b. Civilian parachutes open at bailout altitude, or if<br />
below 14,000 feet, at ATC-assigned altitude.<br />
For situations m<strong>and</strong>ating descent, such as engine failure,<br />
calculations should make allowance for loss of altitude before<br />
bailout. Parent agency policy on minimum engine restart<br />
altitude<br />
(PARACHUTE OPENED AT 8000 FEET OVER OCEAN)<br />
Figure 5-4. Average Winds Aloft Example
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