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less than 1,500 feet. In this case, the appropriate chart must be entered with the pressure
altitude corresponding to the 1,500 feet gross height, as derived from Figure 06−04−7, and
with a temperature 3°C lower than the ambient airport temperature.
PERFORMANCE
Obstacle Clearance
06−04−14
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_010 net_acc_dist_ha.uni
PERFORMANCE
Obstacle Clearance
06−04−15
REV 66, Feb 01/07
Net Acceleration Distance
Figure 06−04−8
DOT Approved
CL−604 Airplane Flight Manual
PSP 604−1
3. MAXIMUM TAKE-OFF WEIGHT LIMITED BY OBSTACLE CLEARANCE REQUIREMENTS
(CONT'D)
F. Examples – Obstacle Clearance Calculations
The two methods of utilizing the preceding charts are given below. Example A shows the
calculation of the maximum allowable take-off weight for a given obstacle. Example B, on the
other hand, determines if the airplane with a given take-off weight can clear a specific
obstacle.
To simplify the following example, it will be assumed that the take-off distance is equal to the
runway length. This approach will result in a conservative value for the maximum take-off
weight limited by obstacle clearance requirements.
Example: DETERMINATION OF THE MAXIMUM ALLOWABLE TAKE-OFF WEIGHT
FOR A GIVEN OBSTACLE
Associated Conditions:
Airport altitude = Sea level (0 ft)
Ambient temperature = 30°C (ISA + 15°C)
Reported wind = 20 knots (headwind)
Take-off flaps = 20°
APR = Off
Anti-ice = Off
10th stage bleeds = Closed
Obstacle height = 2,540 feet (above the take-off surface at
the end of the runway)
Obstacle distance = 15,650 meters (51,348 feet) from the end
of the runway
Example A of Figure 06−04−6 shows that the obstacle clearance reference climb gradient
required for the above conditions is 5.0%. Figure 06−04−6 also shows that the gross height
is equal to 3,000 feet when the obstacle is cleared, and that the gross height is equal to
3,220 feet at the end of the five-minute limit. The gross level-off height selected for take-off
must therefore not be less than 3,000 feet and not greater than 3,220 feet. A gross level-off
height of 3,000 feet will be used for the present example.
Figure 06−04−3 shows that the maximum weight to achieve a reference climb gradient of
5.0% is 19,800 kg (43,651 lb). Therefore, the maximum take-off weight limited by obstacle
clearance requirements is 19,800 kg (43,651 lb).
For a gross level-off height of 3,000 feet, the pressure height above the airport for level
acceleration, is obtained from Figure 06−04−7 and is found to be 2,860 feet, for an ISA + 15
day. Since the airport pressure altitude is 0 ft., the level-off pressure altitude is also equal to
2,860 feet.
The obstacle clearance reference climb gradient derived from Figure 06−04−6 is used to
determine the net acceleration distance using Figure 06−04−8, which Example A shows to
be 5,800 meters (19,030 feet).
PERFORMANCE
Obstacle Clearance
06−04−16
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)
The take-off weight limited by obstacle clearance requirements, determined in the previous
example, can further be improved, if the take-off distance at that weight is less than the
runway length. In this case, the previous calculation procedure is repeated using the obstacle
height and distance relative to reference zero (end of the take-off distance). One or more
iterations may be required to obtain the optimum weight.
Example: DETERMINATION OF THE NET TAKE-OFF FLIGHT PATH
Associated Conditions:
Airplane weight = 15,000 kg (33,069 lb)
Airport altitude = 2,000 feet
Ambient temperature = –3°C (ISA –14°C)
Reported wind = 20 knots (headwind)
Take-off flaps = 20°
APR = Off
Wing anti-ice = On
Cowl anti-ice = On
10th stage bleeds = Closed
Obstacle distance = 12,000 meters (39,372 feet) from
reference zero (end of the take-off
distance)
Obstacle height = 3,125 feet above the airport
Figure 06−04−6 shows that an obstacle clearance reference climb gradient of not less than
8.0% is required in order to clear the obstacle. Figure 06−04−6 also shows that a gross
level-off height of 3,475 feet can be used for take-off.
　
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