M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
PAGE
ISSUE
34
A_November 2012
3.1.2
INSPECTION
OF
FLEXIBLE
SHAFT
pn
118
(See
Fig.
3.1/1
‐
3.1/5)
There
are
various
factors
in
evaluating
the
wear
of
the
flexible
shaft
pn
118:
1.
Entireness
of
coils;
damaged
or
broken
coils
of
the
flexible
shaft
interrupt
its
entireness,
thus
weakening
it,
too.
The
flexible
shaft
must
be
substituted
if
broken
or
damaged
coils
are
found;
2.
Torsional
deformations
are
variations
of
the
shaft's
diameter.
To
feel
them,
simply
pass
two
fingers
along
the
shaft
as
shown
in
the
picture.
If
these
deformations
happen,
it
is
more
likely
that
they
will
be
located
closest
to
the
connections
to
the
pre
‐
rotation
assembly
pn
117
or
to
the
Bendix
gear
unit
pn
GR03
where
the
torsional
stress
is
higher.
If
the
deformation
is
minimal
(less
than
3
mm
on
the
nominal
diameter
of
20
mm),
it
is
possible
to
re
‐
install
the
flexible
shaft.
But
a
further
inspection
after
the
first
50
hours
of
use
is
strongly
recommended.
In
case
of
stronger
deformation,
the
shaft
needs
to
be
replaced;
3.
Longitudinal
deformation;
the
flexible
shaft
pn
118
should
be
immediately
replaced
if
it
shows
permanent
and
discontinuous
deformation
along
its
length;
4.
Coils
sheen;
if
the
coils
appear
to
be
very
polished,
this
means
that
they
have
rubbed
against
the
inner
walls
of
the
sheath
pn
119
for
a
long
time
and
that
the
friction
caused
during
rotation
has
worn
them
out.
This
situation
may
be
emphasized
by
an
insufficient
lubrication.
If
the
flexible
shaft
pn
118
with
polished
coils
has
no
deformation
(similar
to
the
ones
described
above),
it
is
possible
to
re
‐
install
it
after
greasing
it
strongly
first.
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