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VFTO, is flown with the operating engine at maximum continuous thrust (MCT). The flaps are
retracted during the level flight acceleration at a speed of VFTO – 5 KIAS. The final climb segment
is required if the gross level-off height is less than 1,500 feet. The final climb segment extends to
a gross height of 1,500 feet and is flown at a speed of VFTO with the operating engine at MCT.
PERFORMANCE
Obstacle Clearance
06−04−1
REV 66, Feb 01/07
DOT Approved
CL−604 Airplane Flight Manual
PSP 604−1
2. TAKE-OFF FLIGHT PATH (CONT'D)
DFM0604_001
PERFORMANCE
Obstacle Clearance
06−04−2
REV 66, Feb 01/07
Take-Off Flight Path − Gross Level-Off Height Less than 1,500 Feet
Figure 06−04−1
DOT Approved
CL−604 Airplane Flight Manual
PSP 604−1
2. TAKE-OFF FLIGHT PATH (CONT'D)
DFM0604_002
PERFORMANCE
Obstacle Clearance
06−04−3
REV 66, Feb 01/07
Take-Off Flight Path − Gross Level-Off Height Greater than 1,500 Feet
Figure 06−04−2
DOT Approved
CL−604 Airplane Flight Manual
PSP 604−1
3. MAXIMUM TAKE-OFF WEIGHT LIMITED BY OBSTACLE CLEARANCE REQUIREMENTS
The following charts are used to calculate the net take-off flight path to determine the maximum
take-off weight limited by obstacle clearance requirements:
Obstacle Clearance Reference Climb Gradient,
Flaps 20° – Anti-Icing Off = Figure 06−04−3
Obstacle Clearance Reference Climb Gradient,
Flaps 20° – Anti-Icing On = Figure 06−04−4
Net Take-Off Flight Path, Flaps 20° –
Close-In Obstacles = Figure 06−04−5
Net Take-Off Flight Path, Flaps 20° –
Far Obstacles = Figure 06−04−6
Geometric Height Above Airport to
Pressure Height Above Airport Conversion = Figure 06−04−7
Net Acceleration Distance = Figure 06−04−8
A. Obstacle Clearance Reference Climb Gradient, Flaps 20°
Figure 06−04−3 and Figure 06−04−4 are used to determine the obstacle clearance
reference climb gradient for varying conditions of ambient temperature, airport pressure
altitude, airplane weight, APR usage, wind condition and engine bleed configurations. These
charts can also be used to determine the weight at which a specific value of obstacle
clearance reference climb gradient is achieved.
The obstacle clearance reference climb gradient derived from Figure 06−04−3 and
Figure 06−04−4 is equal to the average net gradient between the gear up point and the point
where the airplane reaches the level-off height. The corresponding gross gradient can be
obtained by adding 0.8% to the net gradient.
As the obstacle clearance reference climb gradient is a function of the gross level-off height, it
is necessary to assume a value for the gross level-off height when using Figure 06−04−3 or
Figure 06−04−4. For most obstacle clearance cases, best performance is obtained by
selecting a gross level-off height which ensures that all obstacles will be cleared during the
first or second segments. The minimum required gross level-off height can be conservatively
evaluated from Figure 06−04−5 or Figure 06−04−6 for given values of obstacle height and
distance.
Figure 06−04−3 provides the obstacle clearance reference climb gradient for a flaps-20°
take-off with anti-icing off.
Figure 06−04−4 provides the obstacle clearance reference climb gradient for a flaps-20°
take-off with anti-icing on.
PERFORMANCE
Obstacle Clearance
06−04−4
REV 66, Feb 01/07
DOT Approved
CL−604 Airplane Flight Manual
PSP 604−1
3. MAXIMUM TAKE-OFF WEIGHT LIMITED BY OBSTACLE CLEARANCE REQUIREMENTS
(CONT'D)
DFM0604_003 ntofp_acu_and_off_uc_ha.u
PERFORMANCE
Obstacle Clearance
06−04−5
REV 66, Feb 01/07
Obstacle Clearance Reference Climb Gradient, Flaps 20° − Anti-Icing Off (Page 1 of 2)
Figure 06−04−3
DOT Approved
CL−604 Airplane Flight Manual
PSP 604−1
3. MAXIMUM TAKE-OFF WEIGHT LIMITED BY OBSTACLE CLEARANCE REQUIREMENTS
(CONT'D)
DFM0604_004 ntofp_acu_and_off_c_ha.un
PERFORMANCE
Obstacle Clearance
06−04−6
REV 66, Feb 01/07
Obstacle Clearance Reference Climb Gradient, Flaps 20° − Anti-Icing Off (Page 2 of 2)
Figure 06−04−3
DOT Approved
CL−604 Airplane Flight Manual
PSP 604−1
　
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