System Maintenance And Adjustment; Check Of System With Safety Switch In Test Position; Microswitch Adjustment; Pressure Switch Adjustment - Beechcraft TRAVEL AIR 95 Shop Manual

If
the
landing gear position switch is placed in
the
set
to
operate
at 3
to
5 inches
Hg above
the
throttle
UP position while
the
landing
gear
safety
system
warning
horn switch (see
this
section for proper
switch is in
the
ON position,
the
landing gears
will
setting
of
the
warning horn switch).
This is accom-
retract only when
the
following conditions are plished by a step in
the
cam which operates
the
mutually fulfilled:
throttle
warning horn switch.
1. The airplane must have attained
an
airspeed
of at least 70 mph.
PRESSURE SWITCH ADJUSTMENT
2. One
throttle
setting
must have been advanced The pressure switches are preset
and will not
sufficiently
to
have produced a manifold
pressure
of
normally require adjustment. Because of
the
built-
approximately
19 inches
Hg.
in
tolerance
of
these
switches, they
should not be
tampered
with unless
radically
out of adjustment,
By
the
same
token, the
landing gear
will automati-
that
is unless
the
switch in question fails
to
actuate
cally extend under
the
following conditions: at an airspeed within
2
mph above or below
the
setting recommended
for
it. Even
then the
system
1. The airspeed
must have dropped below 120
plumbing
and electrical
wiring
should be checked
to
mph, ascertain
that
the
source of
trouble
is
not
some-
thing
other
than
improper adjustment of
the
pressure
2. Both
throttles
must have been retarded enough switches.
for
manifold
pressure
to
have
dropped
below approx-
imately 17 inches
Hg.
1. Place
the
aircraft on
jacks.
The
safety
system switch is a
three
position
switch, 2. With
the
master
switch
ON,
the
landing gear
with normally ON and OFF positions. The
switch
circuit breaker
ON,
and
the
landing
gear
warning
also
contains
a
momentary or
test
position
for
circuit breaker OFF, advance
the throttles to
checking
that
the
system
is functioning properly.
maximum position.
When released from
the test
position,
the
switch
returns
to the
ON position.
3.
Place
the
landing gear safety position
switch
in
the
ON position.
SYSTEM MAINTENANCE AND ADJUSTMENT
4.
Place
the
landing gear position switch in
the
UP position.
No maintenance
is required
for
the
landing
gear
safety system, other
than
replacing defective
units
5.
Clamp
a
section
of soft
rubber
tubing
over
the
or checking
the
electrical wiring for
condition,
pitot
head inlet, making
certain
the
connection is
security
of attachment, and
tightness
of electrical
airtight.
Connections.
The switches
are preset
and adjust-
ment will not normally be
required;
however,
6. Crimp
the
end
of
the
tubing
and roll it
up
until
should
the
system
fail
to
function properly,
the
the
airspeed
indicator
registers 70 mph.
The
following
checks
and adjustments may be
accom-
landing
gear
will start retracting immediately if
the
plished, pressure switch is properly
adjusted.
(CAUTION(
CHECK OF SYSTEM WITH SAFETY SWITCH IN
TEST POSITION
To
avoid
rupturing
the
diaphragm
of
the
airspeed indicator,
the
rubber
tubing
must
1. Place
the throttles
in
the
closed or retarded
be rolled
SLOWLY.
position.
•
7.
If
the
landing gear
failed
to
retract in
the
2. Place
the
battery
master switch
ON. The
preceding
step,
turn the
master
switch
OFF and
landing gear
circuit
breaker may be either IN or
adjust
the
pressure switch (outboard switch of
the
OUT.
two
installed in
the
left main wheel well) as follows:
3.
Place
the
landing gear safety system switch a. Secure
the
rolled up
tubing
so
that
it will
in
the
momentary
full
up
(TEST)
position. Noise or
hold
the
airspeed indicator reading at 70 mph.
movement
of
the
solenoid in
the
landing
gear posi-
tion
switch
indicates
that the
automatic landing gear b.
Connect
a continuity
tester
across
the
con-
extension
part
of
the
system
is functioning
properly,
tacts of
the
pressure
switch,
then
turn the
adjust-
The ON-OFF
switch
returns
normally
to the
ON
ment
screw
until
the
switch
closes at
the
70 mph
position
unless
the
pilot intentionally places
the
reading on
the
airspeed indicator.
switch in
the
OFF position.
8.
Turn
the
master
switch
ON and roll up
the
rub-
MICROSWITCH ADJUSTMENT
ber
tubing
until
the
airspeed indicator registers
130
mph,
then
secure
the tubing
so
that the
airspeed
The
landing
gear safety
system
microswitches are indicator
will hold
that
reading.
3-19