N2K25 = N2 x CR = 60.3 x 0.9723 .. =  58.6 %
 VSV Limits (Fig. 505) ............ =  30.4° to 35.1° (open) (closed)
 Accel Target (Fig. 505) .......... =  30.9°

 Nominal Position =
 (30.4° to 35.1°)/2 ............... = 32.75°

 (f)  The VSV position was 33.6°, which is 0.85° from the specified position and in the limits on the closed side. The specified positon is the average of the open and closed limits.
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(g)  
To move the VSV's to the specified position (32.75°), open the VSV's 0.85°. The VSV feedback screw is adjusted three flats counterclockwise.

 (h)  
The engine is motored to the maximum motor speed (24% N2), and the VSV's stay on the closed stop (36.9).

 (i)  
At Ground Idle:

_______________
 OAT = 82°F
 Pamb = 14.22 psia
 N1 = 22.0%
 N2 = 60.1%
 VSV = 32.7 degrees (indicator reading)

 (j)  Calculations:
____________
 Booster Temperature Rise
 (Fig. 503) ....................... = 7.7°F

 T25 = OAT + Booster Rise =
 82 + 7.7 ......................... = 89.7°F

 Correction Factor (CR)
 (Fig. 504) ....................... = 0.9715

 N2K25 = N2 x CR = 60.1 x 0.9715... =  58.4 %
 VSV Limits (Fig. 505) ............ =  30.5° to 35.2°
 (open) (closed)

 Accel Target (Fig. 505) .......... =  30.9°

 Nominal Position =
 (30.4° to 35.1°)/2 ............... = 32.75°

 (k)  The VSV's are 32.7 degrees and in the limits.
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(l) At Flight Idle:
_______________
 OAT = 82°F
 Pamb = 14.22 psia
 N1 = 32.0%
 N2 = 70.6%
 VSV = 24.5 degrees (indicator reading)

 (m) Calculations:
____________
 Booster Temperature Rise
 (Fig. 503) ....................... = 15.5°F

 T25 = OAT + Booster Rise =
 82 + 15.5 ........................ = 97.5°F

 Correction Factor (CR)
 (Fig. 504) ....................... = 0.9640

 N2K25 = N2 x CR = 70.6 x 0.9640 .. =  68.1 %
 VSV Limits (Fig. 505) ............ =  25.3° to 30.1°
 (open) (closed)

 (n) At MPA:
______
 OAT = 79°F
 Pamb = 14.22 psia
 N1 = 89.0%
 N2 = 98.1%
 VSV = 1.6 degrees (indicator reading)

 (o) Calculations:
____________
 Booster Temperature Rise
 (Fig. 503) ....................... = 138.0°F

 T25 = OAT + Booster Rise =
 79 + 138 .......................... = 217°F

 Correction Factor (CR)
 (Fig. 504) ....................... = 0.8755

 N2K25 = N2 x CR = 98.1 x 0.8755 .. =  85.9 %
 VSV Limits (Fig. 505) ............ =  0.6° to 3.9°
 (open) (closed)

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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
　
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