05 - 2 RT60 Rough Terrain Crane
Retract the boom.
Correctly stow the boom.
To make an estimate of the wind speed, use the table that follows:
Wind Force Wind Speed
Effect of the wind on the land
Description
ft-in/s m/s
0 Calm 0 - 8″ 0 - 0.2 No wind, smoke rises vertically
1
Light Air 1′-4″ - 4′-7″ 0.4 - 1.4
Wind direction shown by smoke
drift but not by wind vanes
2
Light Breeze 5′-3″ - 9′-10″ 1.6 - 3
Wind felt on face, leaves rustle,
vanes move by wind
3
Gentle
Breeze
11′-2″ - 17′-5″ 3.4 - 5.3
Leaves and small twigs in
constant motion, wind extends
light flag
4 Moderate
Breeze
18′-1″ - 25′-7″ 5.5 - 7.8
Small branches move
5 Fresh
Breeze
26′-3″ - 34′-9″ 8 - 10.6
Small trees in leaf begin to sway
6
Strong Wind 35′-5″ - 45′-0″ 10.8 - 13.7
Large branches in motion;
difficult to use umbrellas,
whistling heard in telegraph
wires
7
Near Gale 45′-7″ - 60′-9″ 13.9 - 17
Whole trees in motion, difficult
to walk against the wind
8
Gale 56′-5″ - 67′-7″ 17.2 - 20.6
Breaks twigs off trees, impedes
progress
9
Strong Gale 68′-3″ - 80′-5″ 20.8 - 24.5
Slight structural damage (roof
tiles and chimney covers, etc.
blown off)
10
Storm 81′-0″ - 92′-10″ 24.7 - 28.3
Trees uprooted, considerable
damage occurs
G. Do not operate the crane until the conditions are safe.