AIRPLANE
FLIGHT
MANUAL
PERFORMANCE
CTA APPROVED
5-01
ORIGINAL
code 01 Page 17
AFM-1912
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.
REVERSE THRUST PERFORMANCE CREDIT
Reverse thrust performance credit can be granted according to
operational regulations. Usually, reverse thrust credit can be taken for:
- Takeoff field length performance: wet and contaminated runways;
- Landing field length performance: contaminated runway.
Regulations also require that the reverse thrust system reliability be
demonstrated to a certain degree. Lack of this demonstration will
preclude calculation of reverse thrust performance.
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