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g.
Install
the
hubcap
and,
on aircraft
prior
to
TD-534
except
TD-506,
the
five brake
disc
clips.
h.
Bleed
the
brake
system.
REMOVING
AND
INSTALLING
THE
BRAKE
MASTER
CYLINDERS
a.
Close
parking
brake
valve
by pulling
parking
brake
handle.
b.
Unsnap
the
floor
mat and remove
the
floor
board
section
below
the
brake
pedals.
c.
Disconnect
the two
brake
hydraulic
lines
at
each master
cylinder
and
mark
the
lines
to
assure
correct
reinstallation.
d. Remove
the
master
cylinder
attaching
bolts
and nuts and remove
the
master
cylinders.
e.
If new master
cylinders
are
to
be installed,
note
the
positions
of
the
master
cylinder
45-degree
elbow fittings
(if installed).
f.
Reinstall
the
master
cylinders
by reversing
the
removal
procedure.
g.
Bleed brake
hydraulic
system
and fill reservoir.
REMOVING
AND INSTALLING
THE
CABIN
HEATER
a.
Remove
the
nose
cone,
disconnect
the taxi
light
wiring
on
airplanes
incorporating
the
optional
taxi
light
and
remove
the
nose cone,
b. Disconnect
the
iris
valve control
and
the
blower
wiring.
Remove
the
clamp
securing
the
blower
to
the
bracket.
(Heater
blower
is
an optional
installation
on airplane
Serial
TD-453
and after.)
c.
Remove
the
bolts
that
attach
the
iris
valve
to the
fiberglass
plenum
and lift
the
blower
and iris
valve
from
the
plenum.
d.
Disconnect
the
heater
ignition
lead from
the
spark
plug
and
the
heater
igniter.
e.
Disconnect
the
combustion
air flexible
tubing
from
the
combustion air
inlet at
the
heater.
f. Remove
the
fiberglass
plenum
from
the
heater
by removing
the
clamp
and asbestos
strip.
g.
Disconnect
the
fuel inlet line from
the
solenoid in
the
nose
wheel well
and
the
drain
line
at
the
heater
fuel inlet.
h.
Disconnect
the
heater
shroud
drain
line in
the
nose wheel
well.
i.
Remove
the
clamp securing
the
plenum
to the
rear
of
the
heater.
j.
Remove
the two
clamps
securing
the
heater
in
the
wheel well.
k.
Remove
the
heater
attaching
bolts
that secure
the
heater
supporting
ring
to
No.
1
bulkhead
and
remove
the
heater
from
the
nose
section.
1. Installation
is
the
reverse
of
the
removal
procedure.
When installing
the
heater,
position
the
support
ring and gasket
so
that the
heater
exhaust
extends
to the
left of
perpendicular
approximately
8°
on aircraft
prior
to
TD-534
and
straight
down
on TD-534
and after.
m.
Make
certain
the
clamps
securing
the inlet and
outlet
plenums
are
properly
positioned
to
prevent
damage
to
the
plenums.
n.
Use
Presstite
No.
576,
(product
of
Presstite
Engineering
Company,
St. Louis,
Missouri)
as required
when reinstalling
the
blower
and
iris
4-14
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