Embraer 175 - Approach Flap Selection for Takeoff Analysis

AIRPLANE
FLIGHT
MANUAL
PERFORMANCE
ANAC APPROVED 5-01
REVISION 6 code 01 Page 17
AFM
-
1385
The input and range V
2
/V
S
values are “label” values in the sense that
they usually occur in the low thrust to weight ratio region, where the
airplane is at or close to the climb limiting condition. At high thrust to
weight ratio regions the airplane has better accelerating capabilities,
which leads to higher speeds achieved at the takeoff screen height,
thus increasing the output V
2
/V
S
to numbers above the original “label”
input.
LEVEL-OFF HEIGHT
CAFM allows selection of fixed level-off height, maximum level-off
height only, minimum level-off height only, or both maximum and
minimum level-off heights.
The minimum or the fixed level-off height cannot be lower than 400 ft
AGL, but the user can define higher figures. The maximum level-off
height will never be lower than the minimum level-off height.
The fixed level-off height is not changed during flight path calculation.
Therefore, for airport analysis mode, airplane weight will be reduced as
required for obstacle clearance with fixed level-off height. On the other
hand, maximum and minimum level-off heights are adjusted for
optimizing obstacle clearance analysis, except that the user defined
minimum level-off height prevails as a minimum that cannot be
reduced.
When both maximum and minimum level-off heights are available, any
level-off height in between them can be scheduled for flight.
APPROACH FLAP SELECTION FOR TAKEOFF ANALYSIS
The approach flap selected for takeoff runway analysis is used to
compute the climb limited takeoff weight due to the minimum climb
gradient required for go-around at the same airport. There is four climb
limited weights (or WAT limitations) for takeoff, so called: first segment
WAT; second segment WAT, final segment WAT, and approach climb
WAT.
Since the approach flap is tied to the landing flap, one must consider
the landing flap selected for landing at the same airport in case an
emergency occurs and an immediate landing is required after takeoff.
The selected landing flap will dictate the approach flap for takeoff
analysis.