FLIGHT PLANNING
EMB-145 A1 and A1P LB
FAA
AIRPLANE
OPERATIONS
MANUAL
1-05-30
Page
8
Code
03
REVISION 40
AOM-145/1114
DRIFTDOWN TABLE
In the event of an engine failure during cruise it will generally be
necessary to reduce speed and descent to a lower altitude.
Immediately after engine failure set maximum continuous N1 and
allow the airplane to decelerate from the cruise speed to the initial drift
down speed shown in the driftdown table. When this speed is
achieved start the descend profile.
The airplane should level off at the gross altitude and weight shown in
the driftdown table.
NET LEVEL OFF ALTITUDE
Federal regulations require terrain clearance flight planning based on
net performance which is the gross (or real) gradient performance
degraded by 1.1%.
To estimate the net level off pressure altitude, enter with the gross
weight, proceed to the ISA deviation and find the value within bracket.
This is the net level off pressure altitude. The net level off pressure
altitude must clear all en-route obstacle by at least 1000 ft.
In case the obstacles heights are close to the values published in the
following tables, a detailed driftdown analysis must be accomplished.
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