(c)
Find the limits for the VSV position (Fig. 505).
NOTE: The higher VSV angle is more CLOSED and the lower VSV
____
angle is more OPEN.
S 825-015-C00
(7) Adjust the VSV's
(a)
Loosen the locking bolt for the VSV trimmer bracket (Fig. 506).
(b)
Adjust the adjustment screw for the VSV feedback to put the
VSV's in the given limits in the table that follows:
NOTE:____One turn = 6 flats = 1.62 degrees at ground idle. If you turn the adjustment screw clockwise (CW) while you look up at the head of the screw, VSV's will close. If you turn the adjustment screw counterclockwise (CCW) the VSV's will open.
When you open the VSV's, it is recommended not to open the stators to the fully open limit to decrease the engine acceleration time. The recommended target is 0.5 degrees from the open limit. Fig. 505 gives the acceleration targets.
Flats_____ Degrees _____ Degrees_______ Flats _______
1 0.27 8 2.16
2 0.54 9 2.43
3 0.81 10 2.70
4 1.08 11 2.97
5 1.35 12 3.24
6 1.62 13 3.51
7 1.89 14 3.78
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ALL ú ú C10 Page 515 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
N1 % ~ T25 TEMP RISE N1 % ~ T25 TEMP RISE N1 % ~ T25 TEMP RISE
`F `C `F `C `F `C
14.5 2.9 1.6 43.5 28.9 16.1 72.5 90.4 50.2
15.5 3.5 1.9 44.4 30.3 16.8 73.4 93.0 51.7
16.4 4.1 2.3 45.4 31.8 17.6 74.4 95.7 53.2
17.4 4.7 2.6 46.4 33.3 18.5 75.4 98.4 54.7
18.4 5.3 2.9 47.3 34.8 19.3 76.3 101.1 56.2
19.3 5.9 3.3 48.3 36.4 20.2 77.3 103.9 57.7
20.3 6.5 3.6 49.3 38.0 21.1 78.3 106.6 59.2
21.3 7.1 4.0 50.2 39.7 22.1 79.2 109.4 60.8
22.2 7.8 4.3 51.2 41.4 23.0 80.2 112.2 62.4
23.2 8.4 4.7 52.2 43.2 24.0 81.2 115.1 63.9
24.2 9.1 5.1 53.1 45.0 25.0 82.1 117.9 65.5
25.1 9.8 5.4 54.1 46.9 26.0 83.1 120.7 67.1
26.1 10.5 5.8 55.1 48.8 27.1 84.1 123.6 68.6
27.1 11.3 6.3 56.0 50.7 28.2 85.0 126.4 70.2
28.0 12.2 6.7 57.0 52.7 29.3 86.0 129.2 71.8
29.0 12.8 7.1 58.0 54.8 30.4 87.0 132.1 73.4
30.0 13.6 7.6 58.9 56.9 31.6 87.9 134.9 75.0
30.9 14.5 8.1 59.9 59.0 32.8 88.9 137.8 76.5
31.9 15.4 8.5 60.9 61.2 34.0 89.9 140.6 78.1
32.9 16.3 9.1 61.8 63.4 35.2 90.8 143.4 79.7
33.8 17.3 9.6 62.8 65.7 36.5 91.8 146.2 81.2
34.8 18.2 10.1 63.8 68.0 37.8 92.8 149.0 82.8
35.7 19.3 10.7 64.7 70.3 39.1 93.7 151.8 84.3
36.7 20.3 11.3 65.7 72.7 40.4 94.7 154.5 85.8
37.7 21.4 11.9 66.7 75.1 41.7 95.7 157.2 87.3
38.6 22.6 12.5 67.6 77.6 43.1
39.6 23.8 13.2 68.6 80.1 44.5
40.6 25.0 13.9 69.6 82.6 45.9
41.5 26.3 14.6 70.5 85.2 47.3
42.5 27.6 15.3 71.5 87.8 48.8
LP Compressor (Booster) Temperature Rise
Figure 503
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