*
Solenoid.
Functional Description
The APUSOV is a two position valve that is spring loaded closed. The valve is electrically controlled and pneumatically actuated.
Training Information Point
The APU shutoff valve should have the operating placard in view and the electrical connection accessible.
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AIR SUPPLY DISTRIBUTION -APU SHUTOFF VALVE
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AIR SUPPLY DISTRIBUTION -ISOLATION/APU SHUTOFF VALVES -TRAINING INFORMATION POINTS
Purpose
The manual override and position indicator assembly lets you lock the valve closed or open and lets you see the position of the valve.
Location
The assembly is on the opposite side of the valve body as the actuator.
Physical Description
The manual override and position indicator assembly has these parts:
*
Retainer plate
*
Knob bolt
*
Valve shaft hex
*
Lock knob/position indicator
*
OPEN / CLOSED placards.
Functional Description
The knob bolt lets you unlock or lock the lock knob/position indicator to the valve shaft.
The lock knob/position indicator shows you the actual valve disc position. You also use the indicator to lock the valve disc closed or open. The lock knob/position indicator has two positions: LATCH (in) and UNLATCH (out).
The retainer plate holds the lock knob/position indicator and valve shaft so they can not move when the lock knob/position indicator is in the LATCH position (pushed in position).
The hex part of the valve shaft lets you move the valve to OPEN or CLOSED.
Operation
Usually the lock knob/position indicator is locked by the knob bolt to the UNLATCH position. This lets the valve open and close freely.
When you loosen the knob bolt (UNLOCK), the lock knob/ position indicator freely moves in or out along the valve shaft. This lets you set the lock knob/position indicator to any one these positions:
*
LATCH: valve open
*
LATCH: valve closed
*
UNLATCH: valve free movement.
To keep the lock knob/position indicator in one of the above positions you tighten the knob bolt (LOCK).
You use standard hand tools to manually lock or unlock the isolation and APU shutoff valves. The valve shaft and knob bolt are sized for a 7/16 inch wrench.
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AIR SUPPLY DISTRIBUTION -ISOLATION/APU SHUTOFF VALVES -TRAINING INFORMATION POINTS
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AIR SUPPLY DISTRIBUTION -HIGH PRESSURE GROUND CONNECTOR
Purpose
The high pressure ground connectors let an external air source connect to the main pneumatic distribution system. Check valves in the connectors prevent loss of pressurized air.
Location
The high pressure ground connectors are in the under wing fuselage area, forward of the ECS access door, 195EL. You open the access door 195BL to get access to the high pressure ground connectors.
Physical Description
The high pressure ground connector has these parts:
*
Check valve
*
Connector
*
Flange.
Training Information Point
WARNING: DO NOT SUPPLY GREATER THAN 50 PSIG AND/ OR 232C (450F) TO THE PNEUMATIC SYSTEM. IF YOU SUPPLY TO MUCH PRESSURE AND/OR TEMPERATURE DAMAGE TO EQUIPMENT AND INJURY TO PERSONAL CAN OCCUR.
CAUTION: TO PREVENT DAMAGE TO AIR CONDITIONING SYSTEM COMPONENTS, APPLY ELECTRICAL POWER BEFORE YOU APPLY PNEUMATIC POWER AND REMOVE PNEUMATIC POWER BEFORE YOU REMOVE ELECTRICAL POWER.
The air conditioning packs will operate without any protective functions if you pressurize the pneumatic system before you apply electrical power.
Before you depressurize the pneumatic system, make sure the air conditioning packs are off. If you depressurize the pneumatic system with the packs on, the packs will not do the normal pack shutdown on the ground sequence.
See the pack flow control section for more information on air conditioning pack start and shutdown sequences (SECTION 21-51).
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AIR SUPPLY DISTRIBUTION -HIGH PRESSURE GROUND CONNECTOR
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AIR SUPPLY DISTRIBUTION -DUCT
Purpose
The air supply distribution duct connects the pneumatic sources to the users. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 气源 Pneumatic(23)
