Embraer EMB145 Operation Manual page 674

PERFORMANCE
EMB-145 LB
The equivalent obstacle height to be used in a obstacle clearance
calculation is:
+ ΔH
H = H
E A
where:
H = equivalent obstacle height
E
H = actual obstacle height
A
ΔH
= height increments for each distance portion flown in
1, 2, n
2) WIND EFFECT ON THE FLIGHT PATH
a) STRAIGHT FLIGHT PORTIONS
Considering the drift compensation, the straight portions of the
flight path may be corrected to still air equivalent distance as
follows:
Where:
For straight flight:
Where:
b) TURNING FLIGHT PORTIONS
Two effects must be taken into account:
b1) Trajectory Displacement:
The trajectory is displaced in the wind component
direction proportionally to the time.
The displacement may be calculated by:
Page
2
1-04-20
AIRPLANE
OPERATIONS
MANUAL
+ ΔH + ......+ ΔH
1 2
turn to the obstacle.
×
GD TAS
=
SAD
GS
SAD = still air equivalent distance
GD = actual ground distance
TAS = airplane true airspeed (obtained from the radius
of turns and speed conversion chart)
GS = airplane ground speed
GS = TAS + (V
W
V = wind speed
W
α = angle between flight direction and wind direction
Remarks:
V cosα is negative for a head wind component
x
W
V cosα is positive for a tailwind component
x
W
Code
02
n
cosα)
x
REVISION 40