PERFORMANCE
AIRPLANE
FLIGHT
MANUAL
5-01
CTA APPROVED
Page 16 code 01
ORIGINAL
AFM-1912
PERFORMANCE INFORMATION
INPUT DATA ADJUSTMENT TO ENVELOPE
Input data outside the airplane operational envelope is usually
adjusted by the CAFM. This is particularly frequent for input
temperatures, but can also occur for input altitudes and speeds. A
message indicating that input values have been adjusted to the AFM
limits will be shown in the “Messages” tab.
BALANCED V
1
VERSUS OPTIMUM V
1
Optimum V
1
assures the greatest takeoff weight among the V
1
dependent weights. Balanced V
1
can lead to the same takeoff weights
as the optimum V
1
, but not always, depending on the field lengths
available (TORA, TODA, ASDA), and on limitations such as brake
energy, obstacle clearance, V
1
range restrictions, etc.
When balanced V
1
is requested and a balanced takeoff cannot be
calculated, CAFM resumes calculation considering the optimum V
1
.
The balanced V
1
is always presented as the optimum V
1
, and one
must compare TOD/OEI to ASD to check whether they are equal or
not, in order to assure that a balanced takeoff occurs.
V
2
/V
S
INPUT ADJUSTMENT
V
2
/V
S
input data outside the airplane approved range is adjusted by
the CAFM. A message indicating that input values have been adjusted
to the AFM limits will be shown in the “Messages” tab.
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.
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