14.4)
Engine
head nuts:
Afier
break-in
inspection they requirc only annual check.
For re-torquing,
see break-in
procedllle
(section
5).
14.5)
Engine suspension
nuts:
Inspect
visua.lly
regdarly
(pre-flight
check),
Re-rorque annually.
Check
procedrue
with
airframe
manufacturer.
14.6)
Air filtration system:
Inspect
frequently
(10
hours) for cleanliness
depending on rype used
(sce
special opemtion
conditions. section 6).
14.7)
Fuel filtration
systenr:
Check
at least every
10 hours
(see
fuel mixture section 3). Ensure clean fuel at
all times.
14.8) Check
for
carbon build-up and
ring condition:
After approximately
50 hou6 ofuse, the combustionchomberlnayr€quirede-carbonizing. To
inspect,
remove exhaust manifold and check for deposits on
piston
crown. Decarbonizing
is
req0ired ifdeposit thickness
is in
the
range
of
1 mm
(.04
in-).
On
re-assembly
of manifold,
replace
gaskets
if necessary.
Re-torque
afler
first
l0 hours of operatior.
De-carbonizillg
is consideredto be a tecirnical operation
and should therefore be
performed
by
an authodzei
service center only.
To cherk
for
piston
rings sticking in
grooves,
move
pistoN
lateially
ro determine ftee
movement of the
top dng. Ifpiston rings are stuck, consult
your
service
center.
14,9)
Piston
pin
bearing:
Thc
piston pin
is supported
in
the con
rod
eye
by 3l needle
rollers, without
a
cage.
For
disassembly
a special
piston pin
puller
and
particulal
trainingforits use
is necessary.
Piston disassembly is all-
owed
to be done only by an
authorized
workshop.
m.37
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