Piper SENECA III - Page 186

SECTION
7
PIPER
AIRCRAFT
CORPORATION
DESCRIPTION
&
OPERATION
PA-34-220T,
SENECA
III
When
the
gear
is fully
extended
or
fully
retracted
and
the
gear
selector
is
in the
corresponding
position,
electrical
limit
switches
stop
the
flow
of
current to
the
motor
of
the
hydraulic
pump.
The
three
green
lights
to
the
left
of the
landing
gear
selector
switch
illuminate
to
indicate
that
each
of
the
three
landing
gears
is
down
and
locked.
A
convex
mirror
on
the
left
engine
nacelle
both
serves as a
taxiing aid
and
allows the pilot
to
visually
confirm
the
condition of
the
nose
gear.
If
the
gear
is
in
neither
the full
up nor
the
full
down
position,
a
red
warning
light
on
the
instrument
panel
illuminates.
Should the
throttle
be
placed
in
a
low
setting
-
as
for
a
landing
approach
-
while the
gear
is
retracted,
a
warning
horn sounds
to
alert
the
pilot that the
gear
is
retracted.
The
gear
warning
horn
emits
a
90
cycle
per
minute
beeping
sound.
The
green
gear
lights
are
dimmed
automatically
when the
navigation
lights
are
turned
on.
For
this
reason,
if
the
navigation lights
are
turned
on
in
the
daytime, it is
difficult
to
see
the
landing
gear
lights.
If
the
green
lights
are
not
observed
after the
landing
gear
selector
switch
is
placed
in
the"DOWN"
position, the
first
thing
to
check
is
the
position
of
the
navigation
lights
switch.
If
one
or
two
of
the
three
green
lights do
not
illuminate
when
the
gear
down
position
has
been
selected,
any
of
the
following
conditions could
exist
for each
light
that
is
out:
(a)
The
gear
is
not
locked
down.
(b)
A
bulb
is burned
out
(c)
There
is
a
malfunction
in
the
indicating
system.
In
order
to
check
the
bulbs,
the
square
indicator lights
can
be
pulled
out
and
interchanged,
A
micro
switch incorporated in the throttle
quadrant
activates the
gear
warning
horn
under
the
following
conditions:
(a)
The
gear
is
not
locked
down
and
the
manifold
pressure
has
fallen
below 14
inches
on
either
one
or
both
engines.
(b)
The
gear
selector
switch
is in
the "U P"
position
when the
airplane is
on
the
ground.
To
prevent
inadvertent
gear
retraction
should the
gear
selector
switch
be
placed
in the
"UP"
position
when
the
airplane
is
on
the
ground,
a
squat
switch
located
on
the
left
main
gear
will
prevent
the hydraulic
pump
from
actuating
if the
master
switch
is
turned
on.
On
takeoff,
when
the
landing
gear
oleo
strut
drops
to
its full
extension, the
safety
switch
closes
to
complete the
REPORT:
VB-Ill0
ISSUED: JANUARY 8,
1981
7-10