Pt. 25, App. C

(c) Takeoff maximum icing. The maximum
intensity of atmospheric icing conditions for
takeoff (takeoff maximum icing) is defined
by the cloud liquid water content of 0.35 g/
m3, the mean effective diameter of the cloud
droplets of 20 microns, and the ambient air

 - 

CLOUD HORIZONTAL EV<TENT- NAUTICAL MILES

"

4.0 5.0 6.0

2.0

I
I

1 .o
0.8
0.4 0.5!0.6

I I I I I I IJ

0.3

0.8
0.2

temperature at ground level of minus 9 degrees Celsius (Section9 SectionC). The takeoff maximum
icing conditions extend from ground level to
a height of 1,500 feet above the level of the
takeoff surface.

389

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~

0"

Section:;

~

-o

0.9

1.0
....

Q)

0

u

<:

~

<:

+-

1.5

"~

INTERMITTENT MAXIMUM (CUMULIFORM CLOUDS)
ATMOSPHERIC ICING CONDITIONS
r -  VARIATION OF LIQUID WATER CONTENT FACTOR WITH
CLOUD HORIZONTAL EXTENT

"'"'

'"

u
0
u.

.

0

....

+-

u.

E

0I

"'<:Q)

0

<:

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1.2

1- 1

0.26
1 .3

1.35

I

,-

I

"'"

~

"

f'

~

~

FIGURE 6

3.0

0.85

Source of Data
NACA TN No. 2738

5.21

I

Federal Aviation Administration, DOT