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actuator while the gear moves up.
The NLG lock actuator moves the NLG lock mechanism to the
lock position when the NLG moves to the retracted position.
The bungee springs hold the lock links in the over-center locked
position. This holds the NLG in the retracted position.
Extension
Before gear extension, the NLG lock actuator extends. This
unlocks the NLG lock mechanism and lets the NLG extend.
Hydraulic pressure stays on the extend side of the NLG lock
actuator while the gear moves down.
The NLG lock actuator moves the NLG lock mechanism to the
lock position when the NLG moves to the extended position.
The bungee springs hold the lock links in the over-center locked
position. This holds the NLG in the extended position.
NLG EXTENSION AND RETRACTION - LOCK MECHANISM AND LOCK ACTUATOR
EFFECTIVITY
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NLG EXTENSION AND RETRACTION - LOCK MECHANISM AND LOCK ACTUATOR
EFFECTIVITY
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Purpose
The valve manifold controls extension and retraction hydraulic
fluid to the lock actuator.
Location
The valve manifold is on the aft bulkhead of the nose landing
gear wheel well, near the lock actuator.
Physical Description
The valve manifold has two restrictors and two pressure relief
valves.
Functional Description
The valve manifold controls hydraulic fluid flow to and from the
lock actuator. The valve manifold also limits hydraulic pressure
in the lock actuator.
The restrictors decrease the force the lock actuator applies on
the lock links. The restrictors limit the hydraulic flow to 0.4 gpm
(1.5 lpm).
The pressure relief valves release excess pressure that results
from the movement of the nose landing gear backdrives the
lock actuator. The valves open at 3150 psi.
NLG EXTENSION AND RETRACTION - VALVE MANIFOLD
EFFECTIVITY
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NLG EXTENSION AND RETRACTION - VALVE MANIFOLD
EFFECTIVITY
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Purpose
During the extension and retraction sequence, the transfer
cylinder gives a time delay to let the nose landing gear unlock
before the nose landing gear actuator receives pressure.
Location
The transfer cylinder is on the forward bulkhead of the nose
landing gear wheel well.
Physical Description
The transfer cylinder has a piston that moves freely in the
cylinder. One side of the piston connects to the down pressure.
The other side connects to the up pressure.
Functional Description
The piston moves when up or down pressure goes to the
transfer cylinder. When the piston moves, it pushes fluid out of
the transfer cylinder on the side that does not have pressure.
This gives a time delay to the extend or retract side of the nose
landing gear actuator and the lock actuator.
NLG EXTENSION AND RETRACTION - TRANSFER CYLINDER
EFFECTIVITY
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NLG EXTENSION AND RETRACTION - TRANSFER CYLINDER
EFFECTIVITY
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NLG EXTENSION AND RETRACTION - TRANSFER CYLINDER
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General
The NLG extension and retraction system includes these
hydraulic components:
* Gear actuator
　
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