getting to grips with aircraft performance 如何掌握飞机性能 1(31)

Table C9: JAR-OPS Semi-Width at the Start of the Departure Sector
“JAR-OPS 1.495
(d) For those cases where the intended flight path does not require track changes of more than 15°, an operator need not consider those obstacles which have a lateral distance greater than:
.  
300 m, if the pilot is able to maintain the required navigational accuracy through the obstacle accountability area, or

.  
600 m, for flights under all other conditions.”

“JAR-OPS 1.495
(e) For those cases where the intended flight path does require track changes of more than 15°, an operator need not consider those obstacles which have a lateral distance greater than:
.  
600 m, if the pilot is able to maintain the required navigational accuracy through the obstacle accountability area, or

.  
900 m for flights under all other conditions.”

The Required Navigational Accuracy is defined in AMC-OPS 1.495. It can either be obtained via navigation aids, or by using external references in case of Visual Course guidance (VMC day flights).
The following Figures C21 and C22 represent the JAR-OPS departure sectors:

Start of the  Start of the 
takeoff flight path  departure sector  12.5% (7.1o) 
1/2E0  1  1/2E 2  3 
cwy  D  1 
TOD  2 
TORA  3 
TODA 
Figure C21: JAR-OPS Departure Sector (Track change ≤ 15o)

Start of :
Start of . takeoff flight path
turn . departure sector* 12.5% (7.1o) 1/2E
cwy
1/2E0
2 1
D
TOD
3
TORA
1
TODA
2
3
* The start of the departure sector is: -The end of TOD when the turn starts before the end of TODA, or -The end of TODA when the turn starts after the end of TODA
Figure C22: JAR-OPS Departure Sector (Track change > 15o)
Note that the ICAO recommendations for the departure sector (Annex 6) are the same as the JAR-OPS definitions.
FAR 121.189 Subpart I
“FAR 121.189 (d)(2) No person operating a turbine engine powered transport category airplane may take off that airplane at a weight greater than that listed in the Airplane Flight Manual […] that allows a net takeoff flight path that clears all obstacles […] by at least 200 feet horizontally within the airport boundaries and by at least 300 feet horizontally after passing the boundaries.”

5. OUTSIDE ELEMENTS

Determination of the performance limited Takeoff Weight must be done considering the external conditions of the day. These conditions affect the MTOW, which can vary considerably from one day to the other.

“JAR-OPS 1.490
(c) an operator must take account of the following [when determining the maximum takeoff mass]:
　
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