A/C -EQUIPMENT COOLING -FORWARD CARGO COMPARTMENT COMPONENT LOCATIONS -2
EFFECTIVITY BEJ ALL 21-27-00
Page 27
D633W101-BEJ Jan 05/2002
A/C -EQUIPMENT COOLING -AIR FILTER
Purpose
The air filter removes particles from the air before the air cools the equipment.
Physical Description
The filter is a nonwoven fabric and is made of polyester and glass fibers.
Location
The air filter is outboard of the left sidewall panel. It is near the forward ball panel in the forward cargo compartment.
Training Information Point
Remove the sidewall lining to get access to the air filter.
You clean the filter with detergent. You can also blow air from the inside out to clean the filter. You remove two band clamps that attach to the duct and two support clamps to remove the filter from the airplane.
EFFECTIVITY BEJ ALL 21-27-00
Page 28
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
A/C -EQUIPMENT COOLING -AIR FILTER
EFFECTIVITY BEJ ALL 21-27-00
Page 29
D633W101-BEJ Jan 05/2002
A/C -EQUIPMENT COOLING -SUPPLY FANS
Purpose
The two supply fans give air to the supply part of the forward equipment cooling system for blow-through cooling.
Physical Description
The supply fan has these components:
*
Stator housing assembly
*
Check valve (not shown)
*
Electrical connector
*
Electric motor (not shown)
*
Inlet housing assembly.
Location
The two supply fans are outboard of the left sidewall panel near the forward ball panel in the forward cargo compartment. The supply fans are between the override valve and the air filter. The left supply fan is above the right supply fan.
Training Information Point
One fan operates at a time. The right fan is primary and the left fan is backup.
The fans have flow and rotation arrows. The arrows help install the fans correctly.
EFFECTIVITY BEJ ALL 21-27-00
Page 30
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
A/C -EQUIPMENT COOLING -SUPPLY FANS
EFFECTIVITY BEJ ALL 21-27-00
Page 31
D633W101-BEJ May 05/2002
A/C -EQUIPMENT COOLING -OVERRIDE VALVE
Purpose
The override valve permits differential cabin pressure to remove smoke and cool the electronic and electrical components.
Location
The override valve is outboard of the left sidewall panel near the forward ball panel in the forward cargo compartment.
Physical Description
The override valve has these three primary components:
*
Actuator
*
Cooling valve
*
Smoke removal valve.
The actuator has these components:
*
Electric motor (2)
*
Position indicator
*
Electrical connector (2)
*
Manual override knob.
Each motor can operate the override valve.
The cooling valve has a valve body and a butterfly plate assembly (not shown).
The smoke removal valve has a valve body and a butterfly plate assembly (not shown).
Functional Description
A shaft connects the two valves. When one valve is open the other is closed. The override valve has two positions: normal and override. In the normal position, the cooling valve is open and the smoke removal valve is closed. In the override position, the cooling valve is closed and the smoke removal valve is open.
Training Information Point
The override valve has two air flow direction arrows. The arrows help you install the valve correctly.
A position indicator shows the position of the valve. You can use the manual override knob to change the position of the override valve when there is no electric power to the valve.
EFFECTIVITY BEJ ALL 21-27-00
Page 32
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
A/C -EQUIPMENT COOLING -OVERRIDE VALVE
EFFECTIVITY BEJ ALL 21-27-00 中國航空網(wǎng) www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機(jī)維護(hù)手冊 空調(diào) Air Conditioning(23)
