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4.  Variable Stator Vane Actuation Rings (Fig. 3)
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 A.  The actuation rings, which are connected by actuation ring connectors at the horizontal split-line of the compressor casing, rotate circumferentially about the horizontal axis of the compressor. Movement of the rings is transmitted to the individual vanes through vane actuating lever arms.
 5.  Variable Stator Vane Feedback Cable (Fig. 1)
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 A.  A flexible feedback cable, which is attached to the stage 3 bellcrank of the VSV actuator at the 7:30 o'clock position, transmits a feedback signal to the main engine control (MEC) providing actual vane position.
 6.  Operation
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 A.  The VSV's are positioned by two VSV actuators which are operated by fuel pressure from the MEC. In the MEC are a VSV scheduling 3-D cam, which is positioned by N2 and CIT signals; a VSV feedback mechanism which transmits actual vane position to the control; and a VSV pilot valve, which is positioned as a result of the comparison of the scheduling cam position and the feedback signal.
IGV STAGE 1 STAGE 2 STAGE 3 LEVER ARM
ACTUATION RING CONNECTOR
SEE  A
ACTUATION RING LEFT VSV ACTUATORVSV BELLCRANK ASSEMBLY FWD A
G-M56-MM-0035(1)-02-B
Variable Stator Vane (VSV) Bellcrank Assembly and Actuation Rings Location Figure 3
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
B.  Changes in N2 rotate the 3-D scheduling cam, while changes in CIT axially translate the cam. Movement of the cam repositions the pilot valve. The pilot valve ports PF (main fuel pump discharge pressure) to either the head end or rod end port of the VSV actuators, and vents the other end to bypass pressure. The feedback mechanism in the control repositions the pilot valve to stabilize the actuator signal when the vanes reach the scheduled position. For additional information on the VSV feedback system, refer to the description of the Fuel Control system (AMM 73-21-00/001).
 C.  High pressure fuel supplied to the head end port of the VSV actuator causes the piston rod to move aft (extended position), which in turn drives the master rod to position the IGV and stage 3 bellcranks upward (or downward on the right VSV actuator) and the stage 1 and stage 2 bellcranks downward (or upward on the right VSV actuator). Movement of the bellcranks is transmitted to the actuation rings and thus to the individual vanes causing the vanes to close.
 D.  High pressure fuel supplied to the rod end port causes the piston rod to move forward (retracted position), which in turn drives the master rod to position the IGV and stage 3 bellcranks downward (or upward on the right VSV actuator) and the stage 1 and stage 2 bellcranks upward (or downward on the right VSV actuator). Movement of the bellcranks is transmitted to the actuation rings and thus to the individual vanes causing the vanes to open.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
VARIABLE STATOR VANE ACTUATION SYSTEM - MAINTENANCE PRACTICES
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 1.  General
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 A.  This procedure contains steps to operate the variable stator vane (VSV) system. The procedure can be used to change the stator vanes to the open or closed position to examine the system operation after component replacement, or during trouble shooting.
 B.  The VSV system can be operated by an external pressure source or by an engine dry motor. The external pressure source is recommended.
 TASK 75-31-00-732-001-C00
 2.  VSV System Actuation Procedure - External Pressure Source
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 A.  Equipment
 (1)  Cart - Hydraulic, 856A1084, CFM International, P.O. Box 15514, Cincinnati, OH 45215
　
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