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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CFM56 ENGINES
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