getting to grips with aircraft performance 如何掌握飞机性能 1(25)

“JAR-OPS 1.490 (c)(6) […] an operator must take account of the loss, if any, of runway length due to alignment of the aeroplane prior to takeoff.”
Lineup corrections should be made when computing takeoff performance, anytime runway access does not permit positioning the airplane at the threshold.
The takeoff distance / takeoff run (TOD / TOR) adjustment is made, based on the initial distance from the beginning of the runway to the main gear, since the screen height is measured from the main gear, as indicated by distance "A" in Figure C12. The accelerate-stop distance (ASD) adjustment is based on the initial distance from the beginning of the runway to the nose gear, as indicated by distance "B" in Figure C12.

Runways with displaced takeoff thresholds, or ample turning aprons, should not need further adjustment. Accountability is usually required for a 90° taxiway entry to the runway and a 180° turnaround on the runway. The following tables (C2 and C3) contain the minimum lineup distance adjustments for both the accelerate-go (TOD/TOR) and accelerate-stop (ASD) cases that result from a 90° turn onto the runway and a 180° turn maneuver on the runway. For further details, refer to the Airbus Performance Program Manual (PPM).
3.2.4.1. 90 Degree Runway Entry

Table C2: 90° Lineup Distances

3.2.4.2. 180 Degree Turnaround
180 Degree Turnaround
Required Minimum Nominal Line up Aircraft Model Minimum Line up Distance on a 60 m Runway Distance correction *
runway width ** TODA (m)
width
ASDA (m)
(m) TODA (m)
ASDA (m) A300 all models
26.5
45.2
66.1
38.0
56.7 A310 all models
23.3
38.8
61.6
29.0
44.5 A320 all models
16.5
29.1
28.7
16.5
29.1 A319 all models
15.1
26.2
31.1
15.1
26.2 A321 all models
20.9
37.8
33.1
20.9
37.8 A330-200 (Mod 47500)
30.1
52.3
68.2
43.3
65.5 A330-200 (Mod 46810)
31.9
54.1
81.6
55.0
77.1 A330-300 (Mod 47500)
33.2
58.5
70.0
47.9
73.3 A330-300 (Mod 46683)
34.2
59.6
78.8
55.4
80.8 A340-200 (Mod 47500)
31.5
54.8
71.4
47.4
70.6 A340-200 (Mod 46683)
32.2
55.4
76.6
51.8
75.1 A340-300 (Mod 47500)
34.1
59.7
76.0
53.3
78.9 A340-300 (Mod 46683)
34.4
60.0
79.2
55.9
81.5 A340-500
35.9
63.9
72.8
52.8
80.8 A340-600
41.1
74.3
76.6
60.7
93.9
Table C3: 180° Lineup Distances
* Lineup distance required to turn 180 degrees at maximum effective steering angle and end aligned with the centerline of the pavement. The indicated minimum runway width is required (Figure C14, left hand side).
　
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