(5) TORQUE bolts (50) and (55) to between 100 and 110 lbf.in (1.13 and
1.24 m.daN).
END OF SB CFM 75-006
(6) Set VBV feedback sensor as follows :
(a) Install pin (60) securing feedback rod clevis (20) to VBV sensor (40).
(b) Check that sensor arm is well aligned with reference marks. If not aligned, loosen nut (10), remove pin (60) and set assembly by turning clevis by half-turns. TORQUE nut (10) to between 60 and 70 lbf.in (0.67 and 0.79 m.daN).
(c) Check for adequate threads engagement by making sure that a safetywire does not pass through witness hole.
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(d) Lightly coat threads of pin (60) with graphite grease (Material No. CP2101) and secure clevis with pin (60) and nut (30). TORQUE nut (30) to between 28 and 30 lbf.in (0.31 and 0.33 m.daN).
(7) Connect the two electrical cables.
(8) Check of the VBV position (only with AIDS option)
(a) On the MCDU main menu page, push the line key adjacent to the AIDS indication.
(b) On the AIDS menu page, push the line key adjacent to the PARAM ALPHA CALL-UP indication.
(c) On the AIDS PARAM ALPHA CALL-UP page, make sure that VBV gives 0 degree.
Subtask 75-31-70-410-052
B. Close Access Make sure that the work area is clean and clear of tool(s) and other items.
(1) Close thrust reverser cowl doors: (Ref. TASK 78-36-00-410-040) FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR
(2) Remove the warning notice(s).
Subtask 75-31-70-440-051
C. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
Subtask 75-31-70-710-051
D. Do the test that follows:
(1) Do a FADEC ground test with engine motoring (Ref. TASK 73-29-00-710-040).
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Subtask 75-31-70-410-053
A. Close Access
(1) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
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VARIABLE STATOR VANE SYSTEM (VSV) - DESCRIPTION AND OPERATION
_____________________________________________________________
1. General
_______ The Variable Stator Vane (VSV) actuation system consists of 2 VSV hydraulic actuators with dual independent Linear Variable Differential Transducers (LVDT) for position feedback, and 2 actuation mechanisms and linkages. Fuel pressure from the Hydromechanical Unit (HMU) is the hydraulic medium used to operate the VSV actuators.
2. Component Location
__________________
(Ref. Fig. 001, 002)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------
-ACTUATOR AND SENSOR, VSV 75-32-10
3. Description
___________ (Ref. Fig. 003) The VSV system positions the compressor variable vanes (IGV through stage 3) to the angles necessary to provide optimum compressor efficiency at steady state and provide adequate stall margin for transient engine operation. Stator vane angle is a function of core engine speed (N2) and compressor inlet temperature (T25). The electronic control unit (ECU) schedules the VSV's by controlling the VSV actuation valve torque motor in the HMU. The HMU ports high pressure fuel to the rod end or head end of the VSV actuators and vents the other end to bypass pressure. The LVDT transmits a feedback signal of actual vane position to the ECU for comparison to scheduled position. Each VSV actuator is connected through a clevis link and the stage 3 bellcrank to a master rod. Linkages connect the variable vane actuation rings to bellcranks that are connected to the master rod. Connections between the actuator, clevis links, and master rod are made with bolts and bushings for stability. All other linkages are connected with bolts and uniballs to eliminate misalignment or binding. The actuation rings, which are connected 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 levers.
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