background image

791 

Federal Aviation Administration, DOT 

Pt. 36, App. A 

where 

h(d) is listed in Table A36–4 and f

0

in Table 

A36–5; 

a(i) is the attenuation coefficient in dB/1000 

ft; 

q is the temperature in °F; and 
H is the relative humidity, expressed as a 

percentage. 

A36.7.2(b) For calculations using the Inter-

national System of Units (SI): 

α

η δ

θ

θ

i

      

log

0

0

( )

=

+

×

(

)

+

×

[

]

( )

+

×

[

]

10

10

2 05

1000

1 1394 10

1 916984

8 42994 10

2 755624

3

3

.

/

.

.

log

.

.

( )

f

f

and 

δ

θ

θ

θ

=

1010

0

f

10

10

1

3 179768 10

2 173716 10

1 7496 10

2

4 2

6 3

log

.328924

.

.

.

H −

+

×

(

)

×

+

×

(

)

×

where 

h(d) is listed in Table A36–4 and f

0

in Table 

A36–5; 

a(i) is the attenuation coefficient in dB/100 

m; 

q is the temperature in °C; and 
H is the relative humidity, expressed as a 

percentage. 

A36.7.3 The values listed in table A36–4 are 

to be used when calculating the equations 
listed in section A36.7.2. A term of quadratic 
interpolation is to be used where necessary. 

Section A36.8 [Reserved] 

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