M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
PAGE
ISSUE
96
A_November 2012
5.3.2
L ONGITUDINAL
VIBRATIONS
The
longitudinal
movement
of
the
control
stick
(nose
up
and
nose
down)
can
be
smoothened
acting
on
the
tips
of
the
rotor
blades.
In
particular,
it
is
possible
to
make
the
blade
tips
heavier
by
laying
some
tape
(1)
on
the
tip
along
the
blade
profile.
This
should
not
be
done
unless
the
blades
have
visibly
suffered
much
damage,
such
as
removal
of
material
and
consequent
alteration
of
weight
and
of
balance
of
the
set.
5.3.3
DIVERGENT
VIBRATIONS
When
flying,
it
may
happen
that
the
pilot
feels
a
non
constant
and
divergent
vibration
when
he
lightens
the
grab
on
the
stick,
thus
releasing
the
control.
These
vibrations
can
be
considerably
smoothened
by
following
the
procedure
of
paragraph
3.7
"Frictioning
of
controls".
NOTE
‐
results
of
check:
The
above
mentioned
information
has
to
be
considered
purely
indicative
as
each
rotor
may
have
a
different
reaction
to
adjusting
procedures.
5.3.4
REDUCTION
OF
VIBRATIONS
If
the
pilot
feels
an
increase
of
vibrations,
the
following
checks
are
required:
Check
the
correct
tightening
of
the
lock
nut
pn
283
on
the
threaded
bushing
pn
247.
Check
the
tightening
of
the
control
joint
bolts
(see
paragraph
3.7
"Stiffening
of
controls").
5.3.5
CHECK
OF
CORRECT
TIGHTENING
OF
LOCK
NUT
pn
283
ON
THREADED
BUSHING
pn
247
A
slight
loosening
of
the
lock
nut
pn
283
might
cause
high
amplitude
vibrations
on
the
control
stick,
possibly
with
vertical
vibrations
of
the
gyroplane
due
to
the
anomalous
misalignment
of
the
hub
‐
bar
pn
245
with
the
head
pn
066.
Checking
the
tightening
of
the
lock
nut
pn
283
must
be
done
using
the
adequate
tool
MG
TO002
and
checking
the
presence
of
the
marking.
If
the
tightening
of
the
lock
nut
pn
283
is
found
to
be
incorrect,
then
proceed
as
follows:
1.
Before
starting
verify
that
the
engine's
ignition
key
and
push
‐
button
are
in
OFF
position
and
that
all
the
breakers
are
switched
OFF;
2.
Tighten
or
release
the
threaded
bushing
pn
247
to
centre
the
hub
‐
bar
pn
245
with
the
rotor
head
(see
DETAIL
"A");
3.
Tighten
the
lock
nut
pn
283;
4.
Use
a
feeler
gauge
(2)
to
check
if
the
head
pn
066
is
symmetrical
with
the
hub
‐
bar
pn
245;
5.
Flight
test
the
gyroplane
for
an
evaluation
of
the
vibrations.
If
the
rotor
is
not
smooth
enough
because
of
an
excess
of
vibrations,
then
proceed
with
the
setting
of
the
flapping
axis:
Summary of Contents for M16C
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