And After) - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 58P AND BARON 58TC
MAINTENANCE MANUAL
TROUBLESHOOTING
PRESSURILATION SYSTEM
(TJ-3 and after)
TROUBLE PROBABLE CAUSE REMARKS
1. Unable to pressurize,
a.
Cabin altitude controller
a.
Check by performing PRESSURIZATION
inoperative.
TEST.
b. Outflow valve inoperative. b. Check by performing PRESSURlZATION
TEST.
c.
Dump valve solenoid stuck in
c.
Cycle pressurization
system
circuit
open
position. breaker, check for operation
of
solenoid;
replace if inoperative.
d. Shutoff solenoid in cabin d. Cycle pressurization
system
circuit
controller supply
line stuck
in
breaker, check for operation
of
solenoid;
closed position, replace if inoperative.
e.
Outflow valve control
line
e.
Check
for restrictions; repair
or
replace.
restricted.
f. Outflow valve and safety f. Clean the valve seats with
a
lint-free cloth
valve seats
dirty. moistened with isopropyl alcohol.
g.
Firewall shutoff valves pulled
g.
Open valves.
closed.
h. Hole in flex ducts from h. Inspect
and repair
or
replace as
required.
engine.
i.
Excessive pressure leaks
in i.
Check cabin for leaks; repair
as
required.
cabin
(door, seal, etc.)
2. No pressure indication
on
a.
Pressurization
system
switch
a.
Replace switch.
ground.
inoperative.
b.
Rate-of-climb indicator
b. Replace
indicator.
inoperative.
c.
Manifold pressure
too
low
c.
Increase manifold pressure
to
a
minimum
during check. of 20 in. Hg.
I
Maximum cabin
differential
a.
Cabin altitude and differential
a.
Replace
indicator.
pressure exceeds 3.75 psi
on
pressure indicator
TJ-3 thru TJ-168, except TJ- inoperative.
153
or
3.9 psi
on
TJ-153 and
TJ-169 and after.
b.
Safety
valve and outflow b. Replace valves.
valve
out
of adjustment.
c.
True static air
vent
tubes
c.
Inspect
lines and
fittings; tighten
or
loose
or
damaged. replace
as
required.
21-30QO
RaBa
101
Mar 21/80