Cessna T188C - Page 29

MODEL
188
& T188
SERIES
SERVICE
MANUAL
NOTE
Ethylene glycol
monomethyl ether (EGME)
compound
in compliance
with
MIL-I-27686
or Phillips PFA-
The corrosion-preventive mixture will mix 55MB, if used, must be carefully mixed with the fuel
with the engine
lubricating oil, so flushing
in concentrations
not to exceed 0.1 5% by volume.
the oil system is not necessary. Draining ---
the oil sump will remove enough of the cor- CAUTION
rosion-preventive mixture.
Mixing of the EGME compound with the fuel
g.
Service and install
the induction
air filter.
Mixing
of the
EGME compound
with the fuel
h. Remove dehydrator
plugs and spark plugs or
is extremely important
recmmended (0 concentra-
tion
in excess of
that recommended
(0.
15
plugs installed
in spark
plug holes
and rotate
pro-
maximum)
will
result in
peller by hand
several revolutions
to clear
corrosion-
detrimental
affects to
the fuel tanks,
such
preventive
mixture
from
cylinders.
as deterioration
of
protective
primer and
i. Clean,
gap, and install
spark plugs.
Torque
sealants
and damage
to O-rings and
seals
plugs to the values
listed in
Sections 11, 11A,
and
in the fuel
system and engine
components.
11B.
Connect
leads.
Use
only
blending
equipment
that is
recom-
j. Check
fuel strainer.
Remove and
clean filter
mended
by the manufacturer
to obtain
proper
screen. Check
fuel
tanks and fuel
lines for
moisture
proportioning
and sediment, and drain enough fuel to eliminate.
k. Perform
a
thorough
pre-flight
inspection,
then
Do
not allow
the concentrated
EGME com-
start and
warm-up
engine.
pound
to come
in contact
with the
airplane
1. Thoroughly
clean
aircraft and flight
test air-
finish
or fuel cell
as damage can
result.
craft.
2-17. SERVICING. Servicing requirements are Prolonged storage of the airplane will result in a
outlined in figure 2-4. The following paragraphs water buildup in the fuel which "leeches out" the
supplement this figure by
following paragraphs in-
additive. An indication
of this is when an excessive
cluded in
this figure by
adding details
not
amount of
water accumulates
in the fuel tank
sumps.
The
concentration
can
be
checked
using
a differential
2-18.
FUEL TANKS AND CELLS. Fuel tanks
or refractometer.
It is imperative that
the technical
2-18. FUEL
TANKS AND
CELLS. Fuel
tanks or
manual for the differential refractometer be followed
cells should
be filled
to capacity
immediately
after
explicityly
when checking
the additive
concentration
explicitly
when checking
the additive
concentration.
flight to
retard condensation.
The
recommended
fuel
grade for each
model is
listed in figure
2-4.
fuel grade for
each model is
listed in figure
2-4. Alcohol,
if used,
is to be blended
with the fuel
in a
Fuel capacity
for each
model configuration
is
concentration
of 1% by
volume. Concentrations
listed in
Section 1.
greater than
1% are not recommended
since
they can
2-19. USE OF FUEL ADDITIVES
FOR COLD
be detrimental to fuel
tank materials.
WEATHER
OPERATION.
Strict
adherence to
recom-
WEATHER OPERATION. Strict
adherence
to recom-
The manner in which
the alcohol is added to
the fuel
mended preflight
draining
instructions
will
eliminate
is
significant
because
alcohol is
most effective
when
any
free water accumulations
from
the tank sumps.
it
is completely dissolved
in the
fuel To insure
While
small
amounts
of water
may
still remain
in
proper
mixing
the
following
is recommended.
solution
in the gasoline,
it will normally
be consumed
and
go unnoticed
in the
operation
of
the engine.
1.
For best
results
the alcohol
should
be
added
during
the
fueling
operation
by
pouring
the alcohol
One exception
to
this can
be encountered
when
oper-
directly
on the
fuel stream
issuing
from the fuel
ating under
the combined
effect
of: 1)
use of certain
nozzle
fuels,
with 2) high
humidity conditions
on the ground
2. An alternate
method that may
be used is to
3) followed
by
flight
at high
altitude
and low
tempera-
premix
the complete
alco ol
dosage
with some
fuel
ture. Under
these unusual conditions small
amounts in a separate
clean container (approximately
2-3
of water
in solution
can
precipitate
from
the fuel
gallon
capacity)
and
then
transfer
this mixture
to
the
stream and
freeze in sufficient
quantities
to induce
tank
prior to the
fuel operation.
partial icing
of the
engine fuel
system.
Any
high quality
isopropyl alcohol
may be used,
such
While
these conditions
are
quite rare
and will
not
as: Anti-icing
fluid
(MIL-F-5566)
or
isopropyl
alco-
normally
pose
a problem
to
owners
and
operators,
hol
(Federal
Specification
TT-I-735a).
they
do exist in
certain areas
of the world and
con-
sequently
must
be
dealt
with
when
encountered.
Ethylene
glycolmonomethyl
ether
(EGME)
compound
in compliance
with MIL-I-27686
or Phillips
PFA-
Therefore,
to alleviate
the possibility
of
fuel icing
55MB,
if used,
must
be carefully
mixed
with
the fuel
occurring
under
these unusual
conditions
it
is per-
in concentrations
not to
exceed 0.15%
by volume.
missible
to add
isopropyl
alcohol
or
ethyeiene
glycol
monomethyl
ether (EGME)
compound
to the fuel sup-
ply.
See
figure
2-3 for
fuel additive
mixing
ratio.
The introduction of alcohol or EGME compound into
the fuel
provides
two
distinct
effects:
I) it
absorbs
the dissolved
water from
the gasoline and
2) alcohol
has a freezing
temperature
depressant
effect.
2-7