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MAIN HYDRAULIC SYSTEMS -ADP ASSEMBLY -INTRODUCTION
Training Information Point
The EDPs and the ADP pumps are interchangeable. When the pump operates as an ADP pump, the depressurization solenoid does not operate.
CAUTION: MAKE SURE THE ADP ACCESS DOOR IS FULLY OPEN OR FULLY CLOSED WHEN OPERATING THE TRAILING EDGE FLAPS.
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MAIN HYDRAULIC SYSTEMS -ADP ASSEMBLY -INTRODUCTION
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MAIN HYDRAULIC SYSTEMS -ADP ASSEMBLY-AIR DRIVE UNIT
General
Each ADU has these components:
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Modulating shutoff valve (MSOV)
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Turbine gearbox assembly (TGA)
*
ADU heater (not shown).
Modulating Shutoff Valve
The MSOV is a pneumatically-operated butterfly valve that controls airflow to the TGA. A pneumatic actuator moves the butterfly valve.
The MSOV normally operates as a two position valve, either full open or full closed. When the MSOV is open, it supplies the airflow to the turbine.
The MSOV pneumatic actuator modulates the butterfly valve position during secondary speed control.
A position indicator on the MSOV shows the position of the butterfly valve.
The MSOV attaches to the TGA with a V-band clamp. The MSOV also attaches with a V-band clamp to the inlet isolator. The inlet isolator decreases the vibration and noise from the ADP assembly. The inlet duct attaches to the inlet isolator with a V-band clamp.
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Turbine Gearbox Assembly
Pneumatic power goes through the MSOV to the TGA.
The turbine in the TGA turns the gearbox. The gearbox has a planetary gearset to reduce turbine speed to operate the ADP pump.
A pneumatic actuator moves the variable inlet guide vanes (VIGVs) in the TGA assembly. The VIGVs open and close to control the airflow to the turbine. During primary speed control, the VIGVs control the turbine speed.
A position indicator shows the VIGV position.
A TGA lubrication system cools and lubricates the TGA gears, bearings, and seals. An oil filter cleans the TGA oil. The oil filter has a differential pressure indicator to show the condition of the filter.
The heat exchanger on the TGA uses case drain fluid from the ADP pump to cool the TGA oil.
There is an oil sight glass and filler port on the front of the TGA.
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MAIN HYDRAULIC SYSTEMS -ADP ASSEMBLY-AIR DRIVE UNIT
ADU Heater
The ADU heater keeps the temperature of parts of the MSOV and the TGA higher than freezing. This prevents ADU ice formation. The ADU heater is on the ADU and is an LRU.
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MAIN HYDRAULIC SYSTEMS -ADP ASSEMBLY -FUNCTIONAL DESCRIPTION
General
The ADP assembly gets pressurized air from the airplane pneumatic system.
Air flows through the modulating shutoff valve (MSOV) to the turbine gearbox assembly (TGA). The TGA turns the ADP hydraulic pump. The LSCU supplies primary speed control and overspeed protection.
The MSOV has these components:
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Butterfly valve
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Dual coil solenoid (auto and continuous run coils)
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Pneumatic actuator.
The TGA has these components:
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Variable inlet guide vanes (VIGVs)
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Unison ring
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Pneumatic actuator
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Electro-pneumatic servo-valve
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LVDT
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Turbine wheel
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Gearbox
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Monopole speed sensor (2)
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Pneumatic speed sensor
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Primary reserve solenoid
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Secondary speed control fluidic circuit.
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