External Power; Magnetos; Servicing The Oil System - Beechcraft TRAVEL AIR 95 Shop Manual

EXTERNAL POWER (OPTIONAL EQUIPMENT)
oil
system,
open
the
right hand section
of the
cowling
and remove the
filler
cap. On aircraft
TD-174
and
after,
access
doors are
provided
in
the cowling to
Before
connecting
an auxiliary power
unit,
turn
off
service
the
oil system.
A calibrated
dip stick
attach-
the
Battery
and
Generator/Alternator
switches and
ed
to the
filler
cap indicates
the
oil
leveL
The
oil
any other
electrically
operated
equipment.
If
the
should
be changed
every 50 hours
under normal
op-
auxiliary
power unit does
not
have a standard
AN type
erating
conditions. When operating
under
adverse
plug, check
the
polarity
of
the
unit and connect
the
weather conditions
or continuous
high power
settings,
positive
lead
to the
battery
positive post and
the
neg-
the
oil should
be
changed
more
frequently,
ative lead
to the
battery
negative post.
The
aircraft,
having a negative ground system, requires
a neg-
NOTE
ative ground auxiliary power unit.
The special preservative
oil in
the
engines
After
the
aircraft has been started
and the
auxiliary
of
the
Travel Air when
the
airplane is
power unit disconnected,
the
electrical system
delivered
from the factory
should
be
switches
may be
turned on
and normal procedure
changed
for normal
oil after 25 hours
resumed.
of
engine
operation.
Recharging
a battery
without
removing
it
from
the
The oil
may be drained by removing
the
pipe plug
aircraft may be accomplished by connecting a known
from
the
bottom
inboard
side
of
the
oil sump,
the
low
negative ground
auxiliary
power unit
to the
aircraft's
spot of
the
system.
The engines
should
be warmed
external power receptacle and
turning
on
the
battery
up
to
operating
temperature to
assure
complete
master
switch.
In case
of an
extremely
weak battery,
draining of
the
oil. Moisture
that
may have condensed
removing and precharging
may
be necessary since
and settled
in
the
oil sump should
be drained
by
oc-
the
battery may not have sufficient capacity
to
close casionally
removing
the oil
drain
plug
and
allowing a
the
battery
solenoid.
It is essential
that
you make
small
amount of
oil
to
escape;
this
is particularly
certain
the
power
unit
is negative
ground,
otherwise,
important
in winter, when
the
moisture
will collect
a battery
fire
may result.
more
rapidly and
may
freeze.
NOTE
The oil suction and
pressure
screens
should be
cleaned at each periodic oil
change. To
clean the
On aircraft
TD-668
and
after,
a pro-
suction
screen,
remove
the
hex
head plug
at the
rear
tection
feature is incorporated into
the of
the
oil sump and
pull out
the
screen.
To
cleanthe
external
power circuit
to
protect
pressure screen,
remove
four
bolts
that
secure
the
against
a ground
power unit with
screen housing
to
engine
accessory
section.
Pull
reversed
polarity. housing back and remove screen.
Wash
the
screens
in Stoddard
Solvent,
Federal Specification P-D-680.
MAGNETOS
The oil grades
listed below are general
recommend-
Ordinarily,
the
magnetos
will require
only occasional ations
only, and
will vary with
individual
circum-
adjustment, lubrication and
breaker
point replace- stances.
The
determining
factor for
choosing
the
ment.
correct grade
of
oil
is
the
oil
inlet
temperature
ob-
served
during flight. Inlet
temperatures
consistently
CAUTION near
the
maximum
allowable indicates
a heavier oil
is
needed. All oil used should
conform
to
Lycoming
The
internal,
automatic grounding
Specification
301E.
devices
used on
the original S
series
magnetos have proved
unreliable in
Either straight mineral
type
oil
or multi-grade
addi-
service
and current production
magnetos
tive type
oil
may
be
used.
Additive type
oil is not
do not
have
this
feature.
To
be
safe,
recommended
for
use
in excessively dirty engines
treat
all S series
magnetos
as hot
with high
total
operating
time.
However, when it is
whenever
the
ground lead
is dis.
known that the
engine
is
free
from
excessive
sludge
connected. To
ground
the
magneto,
contamination, additive
type
oils can be used
pro-
connect
a wire
to the
switch
lead
at
viding
the
following
precautions are
observed,
the filter
capacitor and
ground
the
wire
to the
engine
case. If grounding
a.
Drain
the
engine
of
all
mineral oil.
is impractical,
remove
the
cable
outlet
plate
on the
rear of
the
magneto
b.
Fill
the crankcase
with
the
desired
grade of
or disconnect all
the
spark
plug
leads.
aviation additive oil.
c. Change
the
oil after five
hours operation and
SERVICING
THE
OIL SYSTEM
check
all
oil
screens
for evidence
of
plugging. If
the
screens
show any
signs
of plugging, change
the
oil
The Travel Air
is provided
with a
wet
sump
pressure-
and
check
the
screens
every
ten
hours until
there
is
type oil system.
Each engine sump capacity
is 8
no more evidence of
plugging.
quarts
with
an absolute
minimum capacity of 2
quarts
required
for safe
engine operation.
To service
the
d.
Resume normal
oil
change periods.
2-12