LANDING GEAR ALTERNATE EXTENSION SYSTEM -NLG ALTERNATE UPLOCK RELEASE ACTUATOR
EFFECTIVITY BEJ ALL 32-35-00
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D633W101-BEJ Sep 05/2002
LANDING GEAR ALTERNATE EXTENSION SYSTEM -ALTERNATE EXTEND HYDRAULIC PRESSURE SWITCH
Purpose
The alternate extend hydraulic pressure switch stops the alternate extend power pack when the extend cycle is complete.
Location
The alternate extend hydraulic pressure switch is on the ceiling in the NLG wheel well. It is near the NLG alternate uplock release actuator.
Functional Description
The pressure switch is in the hydraulic line between the NLG door release/safety valve module and the NLG alternate uplock release actuator.
The NLG alternate uplock release actuator is the farthest point in the alternate extension system from the power pack. It is the last component to get hydraulic pressure.
The switch opens when there is 2100 psi in the pressure line. This removes electrical power from the alternate extend power pack and it stops.
When the alternate extend pressure decreases below 1700 psi, the pressure switch closes to reset the alternate extension system.
EFFECTIVITY BEJ ALL 32-35-00
Page 24
D633W101-BEJ Sep 05/2002
LANDING GEAR ALTERNATE EXTENSION SYSTEM -ALTERNATE EXTEND HYDRAULIC PRESSURE SWITCH
EFFECTIVITY BEJ ALL 32-35-00
Page 25
D633W101-BEJ Sep 05/2002
LANDING GEAR ALTERNATE EXTENSION SYSTEM -LANDING GEAR DOOR UNSAFE LIGHTS
Purpose
A red landing gear door unsafe light is in each wheel well. Each light turns on when the door is open and the wheel well is not safe to enter. The position of the safety valve in the landing gear door release/safety valve module controls the light.
Location
A main landing gear door unsafe light is on the lower part of the keel beam in each wheel well.
The nose landing gear door unsafe light is on the nose landing gear wheel well forward bulkhead above the right nose landing gear forward door.
Training Information Point
A press-to-test switch on the main wheel well electrical service panel tests the operation of both main landing gear door unsafe lights.
A press-to-test switch on the service and APU shutdown panel tests the operation of the nose landing gear door unsafe light.
WARNING: MAKE SURE THE DOOR UNSAFE LIGHT IN EACH WHEEL WELL FOR THE MAIN LANDING GEAR IS OFF. IF A DOOR UNSAFE LIGHT IS ON, DO NOT GO INTO THE RELATED WHEEL WELL. WHEN A DOOR UNSAFE LIGHT IS ON, THE DOOR FOR THE RELATED MAIN LANDING GEAR IS IN A NOT SAFE CONDITION AND CAN ACCIDENTALLY CLOSE. THE DOORS CLOSE QUICKLY AND CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
WARNING: MAKE SURE THE DOOR UNSAFE LIGHT IN THE WHEEL WELL FOR THE NOSE LANDING GEAR IS OFF. IF THE DOOR UNSAFE LIGHT IS ON, DO NOT GO INTO THE WHEEL WELL. WHEN THE DOOR UNSAFE LIGHT IS ON, THE DOORS FOR THE NOSE LANDING GEAR ARE IN A NOT SAFE CONDITION AND CAN ACCIDENTALLY CLOSE. THE DOORS CLOSE QUICKLY AND CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
EFFECTIVITY BEJ ALL 32-35-00
Page 26
D633W101-BEJ Sep 05/2002
LANDING GEAR ALTERNATE EXTENSION SYSTEM -LANDING GEAR DOOR UNSAFE LIGHTS
EFFECTIVITY BEJ ALL 32-35-00
Page 27
D633W101-BEJ Sep 05/2002
LANDING GEAR ALTERNATE EXTENSION SYSTEM -LANDING GEAR DOOR CLOSED SWITCHES
Purpose
The landing gear door closed switches supply landing gear door position input to control landing gear door unsafe light operation.
Each main landing gear door has a MLG door closed switch. The nose landing gear forward doors have a single NLG door closed switch.
Physical Description
The switches are mechanical plunger-type switches. They operate by direct contact with the landing gear door.
The switches open when the landing gear doors are closed. The door unsafe lights are always off when the LG doors are closed.
The switches close when the LG doors are open.
Location
The NLG door closed switch is on the forward bulkhead of the nose landing gear wheel well.
A MLG door closed switch is in the outboard forward corner of each main landing gear wheel well on the forward door stop.
EFFECTIVITY BEJ ALL 32-35-00
Page 28
D633W101-BEJ Sep 05/2002
LANDING GEAR ALTERNATE EXTENSION SYSTEM -LANDING GEAR DOOR CLOSED SWITCHES
EFFECTIVITY BEJ ALL 32-35-00
Page 29
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