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A4 - Interceptor
400 - How
do you change the Feathering shaft ?
First off, the
Interceptor 400 is possibly the easiest helicopter to change a
feathering shaft on. Feathering shafts are designed to deform (bend)
on a crash or even heavy landing where the main blades can be forced
down far further than you might expect.
On the Int
400, the first thing to do is to remove the main blades by undoing
the single socket headed bolt that holds each of them in place. Make
sure that you also remove the nylock nut underneath, as this is only
a light press fit into the bottom of the blade holder, and can
easily fall out and get lost.
Once the
blades have been removed, you will see that there are 2 small
screws, one on each side of the bearing that need to be removed
first to allow you to locate the 5.5mmm socket driver on the nylock
nut fully. Also disconnect the arm that goes to the main blade
holders themselves.
Loosen and
remove one of the nylock nuts, and pull the blade holder outwards
until it comes off. Normally you will see that there is a small
black carbon spacer left on the feathering shaft, so remove that as
well. The next thing is to simply pull the other blade holder
out complete with the feathering shaft. Now this can be a
problem if the bend in the feathering shaft is on the side of the
blade holder you have already removed. If it will not come out, hold
that end of the feathering shaft with a mole wrench or similar tool
and then undo fully the nylock nut on the other end so that you
remove that main blade holder first, and then simply pull the
feathering shaft out from the other end. Don't forget to find
the little carbon spacer on that side as well. Finally, check
to see that the damper rubber rings ( "O" rings) are still
in the main head casting. There are 4 of the damper rings, 2
on each side. If they are in the head, remove them carefully
so that you can inspect them.
Check the
damper rubbers carefully for any signs of excessive softening, or
cuts caused by the carbon spacer. If you think they need replacing -
DO IT, these are important.
Take your new
feathering shaft and put a nylock nut on one end just far enough
that it is just starting into the nylock part. Next take one of the
main blade holders and slide the feathering shaft through from the
outer side (blade side). NOTE there is a small alloy spacer
inside the blade holder between the two bearings that are in there.
This may have moved, stopping the feathering shaft from going
through. Use a thin screwdriver or similar tool to poke
thorough and get the spacer positioned centrally again.
Once the blade
first holder is on the feathering shaft, put one of the black carbon
spacers on the shaft. Check that you have TWO damper rings in
place in the head, or else put them on the feathering shaft as the
last item so that the carbon spacer will push them into the head
recess. Push the feathering shaft all the way in. Now put 2
damper rings on the other end of the feathering shaft if they are
not already in place in the head followed by a black carbon spacer
and then the other blade grip. You should be able to see a few
mm of thread visible on this side. Use a 5.5mm nut runner to
start the other nylock nut on that thread.
Continue to
tighten both nuts up until you cannot tighten them any more. You
will need TWO 5.5mm nut runners to do this job. Once it is
fully tightened, replace the 2 small screws in each blade holder and
just nip them down, reconnect the connecting rod to each blade
holder and refit the main blades.
JOB
DONE - IT REALLY IS THAT SIMPLE.
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