*
NLG doors close switch.
These switches are two-position toggle switches. To operate the switches, you must pull them out from the OFF detent. Both switches are spring-loaded to OFF.
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LANDING GEAR ALTERNATE EXTENSION SYSTEM -GROUND DOOR OPERATION CONTROLS
You must operate both switches at the same time. You move the switches to the ARM and CLOSE positions to close the NLG doors. The doors close with center hydraulic system pressure.
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LANDING GEAR ALTERNATE EXTENSION SYSTEM -GROUND DOOR OPERATION CONTROLS
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LANDING GEAR ALTERNATE EXTENSION SYSTEM -ALTERNATE EXTEND POWER PACK
Purpose
The alternate extend power pack supplies hydraulic pressure to the alternate extension system.
Physical Description
The power pack is an electric motor hydraulic pump. The 28v dc hot battery bus supplies power to the motor.
An oversize tube from the center hydraulic system reservoir supplies hydraulic fluid to the hydraulic pump in the power pack.
The power pack has internal hydraulic routing to let hydraulic fluid flow back into the oversize supply tube when the power pack is off.
Location
The alternate extend power pack is in the aft-inboard corner of the left main landing gear wheel well.
Training Information Point
The supply tube connects to the side of the reservoir. The connection is slightly below the reservoir refill level (0.75 reservoir fluid level). This makes sure that a hydraulic fluid leak in the alternate extension system is detected by reservoir refill indications. This also makes sure that the supply tube is filled when the reservoir is correctly serviced.
A leak in the alternate extension system does not drain all the fluid from the center hydraulic system reservoir.
The supply tube from the reservoir contains enough hydraulic fluid to do an alternate extension. The alternate extension system does function with an empty center hydraulic system reservoir.
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LANDING GEAR ALTERNATE EXTENSION SYSTEM -ALTERNATE EXTEND POWER PACK
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LANDING GEAR ALTN EXTENSION SYSTEM -DOOR RELEASE/SAFETY VALVE MODULES -GENERAL DESCRIPTION
Purpose
There is one main landing gear door release/safety valve module for each main landing gear. There is one nose landing gear door release/safety valve module.
When the alternate extension system operates, the door release/safety valve modules do these functions:
*
Stop the normal hydraulic system pressure to the close side of each landing gear door actuator
*
Connect the close side of each door actuator to return, so the doors can open
*
Extend a rod to release the landing gear door locks
*
Send pressure to the alternate uplock release actuators to release the landing gear uplocks.
Each MLG door release/safety valve module extends a rod to push the gear door uplock mechanism to release the over-center lock. This permits the MLG doors to open. The NLG door release/safety valve module extends a rod to push a crank on the NLG door actuator. This crank turns to release the lock inside the NLG door actuator. This permits the NLG doors to open.
The door release/safety valve modules also have a reset function to close the doors. You use switches on the P40 and P56 panels to reset the modules. Center hydraulic system pressure closes the landing gear doors.
Location
The main landing gear door release/safety valve modules are inside the door uplock assembly. A removable panel permits access to the module.
The nose landing gear door release/safety valve module is on the ceiling in the nose wheel well near the nose landing gear door actuator.
Training Information Point
The nose landing gear door release/safety valve module is not interchangeable with the main landing gear door release/safety valve modules.
You install door lock pins in the door release/safety valve modules for safety. With the pins installed, you cannot reset the modules and the doors cannot close.
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LANDING GEAR ALTN EXTENSION SYSTEM -DOOR RELEASE/SAFETY VALVE MODULES -GENERAL DESCRIPTION
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