And After) - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 58P AND BARON 58TC
MAINTENANCE MANUAL
PRACTICES (TJS and
a t t e r ) P R E S S U R I Z A T I O N
CONTROLS MAINTENANCE
CLEANING THE CABIN
OUTFLOW CONTROL
VALVE,
SAFETY
VALVE FILTERS AND SEATS
OUTFLOW VALVE AND SAFETY VALVE/DUMP
The outflow and
safety valve filters
and seats must be
SOLENOID REMOVAL cleaned every 100 hours. The outflow and
safety valve
filters
are
to
be
replaced
every
500 hours.
For cleaning and
a.
Remove the upholstery panels from the forward
replacement
instructions refer
to
AiResearch Operation
and
side of the aft pressure bulkhead making the valves
Maintenance Instructions
Manual, Report
No. 4-267.
accessible.
b.
Loosen and
remove
all
necessary
plumbing from
FUNCTIONAL TEST OF OUTFLOW VALVE AND
the valve. Cap
open
plumbing
to
keep shop soil, dirt and
SAFETY VALVE
foreign objects from entering.
c.
Remove the
access
door
on
the lower LH OUTFLOW VALVE FLIGHT CHECK
fuselage, just aft of the
rear
pressure bulkhead.
(TJ-3 end after)
d. Station
a man
inside the ah
fuselage
to
remove
the
attaching bolts and
remove
the valve.
a.
While the
airplane is in flight
ensure
that the cabin
pressure can
be maintained
at (/2 psid (pounds
per square
inch
differential) less than maximum differential
(3.75 psi
on
OUTFLOW VALVE AND SAFETY VALVUDUMP
TJ-s thru
TJ-163, except TJ-153 and 3.9
psi
on
TJ-153 and
SOLENOID INSTALLATION
TJ-169 and after).
b.
If the cabin pressure
cannot
be maintained
at 1/2
a.
Station
a man
inside the aft fuselage
to position psid below the maximum differential and goes
to maximum
the valve and install the
attaching bolts.
Torque the differential, the outflow valve
must
be replaced. Refer
to
attaching
bolts
to
5
r
1
inch-pounds. OUTFLOW VALVE AND SAFETY VALVE/DUMP
SOLENOID REMOVAL
and OUTFLOW VALVE
AND
SAFETY VALVE/DUMP SOLENOID
INSTALLATION
in this
NOTE
chapter for removal and installation
procedures of the
outflow valve.
When reinstalling the existing
valve
or
installing
a new
valve, the existing mounting gaskets and SAF~V VALVE GROUND
CHECK
seals
must
be discarded and the applicable
new
(tJ-3 and after)
gaskets and attaching parts
(if required)
must
be installed. Use
water
only
as a
lubricant
on a.
Connect
a
regulated cabin
pressurization test unit
EVA tubing being installed
over
beaded tubing
to
the
airplane
as
instructed
in Chapter
21-30-00. (Do
not
or
fittings.
pressurize
at this
time.)
b. Working through the
access
opening behind the
aft pressure
bulkhead, locate the line that connects the
b. Install the
acc~ss
door
on
the LH fuselage. dump solenoid valve
to the safety valve and disconnect the
c.
Remove the dust caps and install the plumbing
to
line from the solenoid valve.
the'vahve. Earlier serials
use
Rared fittings, while the later
c.
Connect
a
regulated
vacuum source to
the line
serials equipped with the plastic outflow valves
use a
which
was
disconnected from
the solenoid valve.
(Do
not
beaded tube fitting and clamps
to
secure
the
plumbing,
apply
vacuum
at
this
time.)
d.
Install the upholstery panels. d.
Pressurize the cabin
to
3 paid.
a.
Slowly apply
regulated
vacuum
to
the
safety
valve. if the valve opens before the
vacuum
reaches 4
OUTFLOW VALVE AND SAFEN VALVE/DUMP
inches
Hg indication
on
the test
unit, the valve is operating
SOLENOID ADJUSTMENT
satisfactorily. If
more
than 4 inches Hg
are
required
to open
the
safety valve, the valve must be
replaced.
The outflow valve and safety valve/dump solenoid
are
preset
at the factory
and should
require
no
further
CABIN ALTITUDE
CONTROLLER
REMOVAL
adjustment. Any time the valve seal is broken the
WARRANTY
(6 months in
duration)
is
VOIDED.
a.
Remove the
attaching
screws
at the control
console.
b. Loosen and
remove
plumbing from the controller.
NOTE
Cap
open
plumbing
to
keep shop
soil, dirt and
foreign
objects from
entering.
Plastic (Lexan) valves
are
not
adjustable,
c.
Remove the controller.
21-30QO
Page 201
Mar 21180