M16 (C) TANDEM TRAINER
MAINTENANCE MANUAL
.
ISSUE
PAGE
A_November 2012
97
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.
Loosen
the
lock
nut
pn
283;
3.
Rotate
the
threaded
bushing
pn
247
a
quarter
of
a
turn
(90°)
clockwise
or
counter
‐
clockwise;
4.
Tighten
the
lock
nut
pn
283;
5.
Flight
test
the
gyroplane
for
an
evaluation
of
the
vibrations.
Repeat
this
adjusting
of
the
threaded
bushing
pn
247
several
times,
turning
it
clockwise
or
anticlockwise
until
reaching
the
best
compromise
on
vibrations.
It
is
very
important
to
move
the
threaded
bushing
pn
247
only
90°
at
a
time,
for
a
maximum
displacement
of
one
turn
and
a
half
(1,5
mm
on
the
pitch
20x1
of
the
threaded
bushing)
from
central
position.
6.
Once
a
satisfying
condition
has
been
achieved,
mark
the
position
of
both
the
lock
nut
and
threaded
bushing
with
the
special
marking
paint.
5.4
PRE
‐
ROTATION
SYSTEM
ENGAGING
ANOMALY
(See
Fig.
5.4/1)
If
the
pre
‐
rotation
system
does
not
get
engaged,
an
inspection
is
required
to
identify
the
anomaly
generating
the
problem.
According
to
the
anomaly
found,
proceed
as
described
below.
5.4.1
ANOMALY:
NO
POWER
TRANSMISSION,
NO
SYSTEM
ENGAGING
Pulling
the
control
lever
pn
415
during
pre
‐
rotation,
the
system
does
not
get
engaged.
No
strange
noises
are
heard
nor
anomalous
vibrations
are
felt.
It
is
quite
likely
that
there
is
no
power
transmission
between
the
propeller
pn
125
and
the
belts
pn
A28.
The
belts
pn
A28
are
not
driven
or
their
movement
is
not
sufficient
to
engage
the
system.
a.
Verification
of
the
pre
‐
rotation
control
line
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.
Make
sure
the
pre
‐
rotation
control
cable
pn
1,5x3900
is
not
damaged;
3.
If
the
cable
is
broken,
replace
it
as
explained
in
paragraph
3.9.4.
b.
Verification
of
the
tension
of
the
pre
‐
rotation
belts
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.
Pull
the
pre
‐
rotation
control
lever
pn
415
until
it
reaches
its
stop;
3.
Once
this
condition
is
reached,
inspect
the
tension
of
the
belts
pnA28
on
the
relative
pulleys
pn
124
and
(1).
5.4.2
ANOMALY:
POWER
TRANSMISSION
OK,
NO
SYSTEM
ENGAGING
During
pre
‐
rotation
the
system
does
not
get
engaged
when
pulling
the
control
lever
pn
415.
Presence
of
anomalous
vibrations.
The
flexible
shaft's
outer
sheath
pn
119
gets
overheated.
In
this
situation
it
is
very
likely
that
the
flexible
shaft
pn
118
is
rotating
even
if
the
system
does
not
work.
a.
Verification
of
the
flexible
shaft's
entireness
1.
Before
starting
verify
that
the
engine's
ignition
key
and
push
‐
button
are
in
OFF
position
and
that
all
the
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