WARNING
SECTION III. OPERATION
2.7
ASSEMBLY AND PREPARATN FOR USE.
TM 9-6230-210-13&P
UNDER USUAL CONDITIONS
DO NOT operate floodlight Set in winds exceeding 50 miles per hour (80.45 kph).
Refer to Table 2-2 for a guide in determining wind velocity.
Front outriggers must be set at the 45° angle while operating.
When unit is operating on a slope, front of unit must face downhill.
Table 2-2. Beaufort Scale
BEAUFORT
DESCRIPTION
MILES PER
DESCRIPTION
NUMBER
HOUR
0
Calm
Less than 1
Calm; smoke rises vertically.
1
Light air
1 - 3
Direction of wind shown by wind vanes.
2
Light breeze
4 - 7
Wind felt on face; leaves rustle;
ordinary vane moved by wind.
3
Gentle breeze
8 - 12
Leaves and small twigs in constant
motion; wind extends light flag.
4
Moderate breeze
13-18
Raises dust and loose paper; small
branches are moved.
5
Fresh breeze
19-24
Small trees in leaf begin to sway;
crested wavelets form on inland waters.
6
Strong breeze
25-31
Large branches in motion; telegraph
wires whistle; umbrellas used with
difficulty.
7
Moderate gale (or near gale)
32-28
Whole trees in motion; difficulty in
walking against wind.
8
Fresh gale (or gale)
39-46
Breaks twigs off trees; generally
impedes progress.
9
Strong gale
4 7 - 54
Slight structural damage occurs;
chimney pots and slates removed.
10
Whole gale (or storm)
55-63
Trees uprooted; considerable structural
damage occurs.
11
Storm (or violent storm)
64-72
Very rarely experienced; accompanied
by widespread damage.
12
Hurricane
73-136
Devastation occurs.
The U.S. uses 74 statute MBA as the speed criterion for hurricanes.
2-7
