(2) Remove the access platform(s).
(3) Remove the warning notice(s).
R Subtask 75-26-10-865-051
R B. Remove the safety clip(s) and the tag(s) and close this(these) circuit R breaker(s):
R -------------------------------------------------------------------------------R PANEL DESIGNATION IDENT. LOCATION R -------------------------------------------------------------------------------R 49VU FUEL/LP VALVE/MOT1/ENG2 2QG A09 R 49VU FUEL/LP VALVE/MOT1/ENG1 1QG A08
R Subtask 75-26-10-862-050
R C. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-R 002).
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IGNITION SYSTEM COOLING - DESCRIPTION AND OPERATION
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1. General
_______ The ignition cables are air cooled in order to not exceed temperature limits: 204 deg.C (399.2 deg.F) (steady state), 232 deg.C (449.6 deg.F) (transient). Cooling air for the high energy igniter harness is taken from the fan frame outlet near the electrical junction box.
2. Description
___________ (Ref. Fig. 001, 002) Booster discharge air is bled from the fan frame hub. The air is carried by a tube to the tube bundle junction plate at 6 o'clock. There the cooling air enters the convoluted circuits of the two ignition leads through an inlet adaptor.The air exits the lead at the spark igniter plug connector and becomes ventilation air within the core cowlings.
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Ignition Cooling - General
Figure 001
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Ignition Cooling - Air Distribution
Figure 002
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COMPRESSOR CONTROL - DESCRIPTION AND OPERATION
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1. General
_______ The variable stator vane (VSV) and the variable bleed valve (VBV) are controlled by the ECU. The VSV system controls the air flow (primary) through the compressor downstream of the booster. The variable stator vane actuators position the inlet guide vanes and stator vanes as scheduled by the ECU through HMU. The VBV system automatically schedules the total opening by positioning the valves as a function of corrected core and corrected fan speed.
2. Variable Stator Vane System (VSV)
_________________________________ (Ref. 75-32-00) The VSV system maintains satisfactory the compressor performance over a wide range of operating conditions. The system varies the angle of the inlet guide vanes and the 3 stages of variable vanes, to aero-dynamically match the low pressure stages of compression with the high pressure stages. This variation of vane position changes the effective angle at which the air flows across the compressor blades and vanes. The angle determines the compression characterictics (direction and velocity) for any particular stage of compression.
3. Variable Bleed Valve System (VBV)
_________________________________ (Ref. 75-31-00) At low core engine speeds the booster provides more air than the core engine can utilize. To match the booster discharge airflow to the core engine requirements at low speed, excess air is bled off through variable bleed valves (VBV) into the fan discharge air stream. At higher engine speeds the VBV are closed so that all the booster discharge (primary air flow) enters the core engine. The VBV are scheduled as a function of corrected core engine speed and corrected fan speed and receive this signal from the HP compressor airflow control system. (The VBV system is controlled by the ECU through the HMU.)
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E 56-5B E E E VARIABLE BLEED VALVE SYSTEM (VBV) - DESCRIPTION AND OPERATION
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1. General
_______ (Ref. Fig. 001, 002) The variable bleed valve (VBV) position is related to the high pressure compressor (HPC) operation. It is directly controlled by the angular setting of the variable compressor stator vanes at steady-state operation and during acceleration. The bleed valves open during low and transient operations to increase the booster mass flow and to improve booster and HPC matching. The bleed valves are fully open during fast decelerations. The bleed valve control system includes the following:
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