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Hello Net:
I am building an L235 and am at the point of rigging the nose gear.  The drawings are fragmented and show the nose gear door actuator and sequencing switch on one drawing and the nose gear retraction actuator on another drawing.  The main gear inner door actuators have high and low pressure connections which seems reasonable.

The nose gear door actuator plan only shows one connection and an unidentified dot at the opposite end of the cylinder.  If you leave the upper opening into the cylinder open (not a good Idea) this would probably work but would also cause the fill level in the reservoir to fluctuate depending on the door position.

Does anyone know what I am talking about and what you do about it.

Hank H. - San Mateo, Ca.


[Hank... the typical setup recommended by the factory is to only provide
high (gear up or close) pressure to the nose gear door actuator.  The force
of the spring should be enough to open the door when the gear is cycled
down.  Naturally, simply leaving the lo pressure port open to the
atmosphere is not the best idea in the world and if you are going that
route you should consider at the least an exhaust muffler (sintered brass
filter attached to a 1/8npt fitting) to protect the innards of the cylinder
from foreign materials.

The option is to plumb the low side of that cylinder into the low pressure
circuit and is highly recommended... that configuration is shown as an
option in later [320/360] manuals and I believe most folks are
incorporating that additional plumbing.  It only takes one additional AN
fitting, the changing of one fitting to a Tee, and one more hose attached
to the down (lo press.) side of the nose gear actuating cylinder.  A Teed
AN bulkhead fitting can also be used to get the lo-pressure hydraulic feed
into the nosegear tunnel and the line can be taken from there, just as the
hi-pressure side is plumbed.

An additional benefit to plumbing in the lo-press. side of that cylinder is
that the opening of the nose gear door should be more positive which will
help keep the nose gear strut from contacting it during the extend
operation.  This subject has been discussed here several times in the past
and you should be able to locate several instances of the phrase 'nose gear
door' in the archives.

    <Marv>    ]

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