Piper Lance II User Manual

10-5.
TROUBLESHOOTING.
TABLE
X-l. VACUUM
SYSTEM
LANCE
II SERVICE
MANUAL
d.
Vacuum
Regulator:
1.
The
vacuum
regulating
valve
seldom
needs
replacement.
Symptoms
that
suggest
replacement
are:
(a)
Rapid
fluctuation
of
the
vacuum
gauge
needle.
(b)
Non-repeatability
of
the
vacuum
gauge
reading
when
the
panel
gauge
is
not
suspect
or has
been
checked
against
a known
test
gauge
(cruise
RPM
only).
2. All
modes
of regulator
malfunction
tend
to increase
the
vacuum
power
applied
to the
gyros.
Thus,
although
excess
vacuum
is
applied,
a loss
of
vacuum
does
not occur.
3. The
gyros
themselves
act as
a
limiting
device
to
keep
the
vacuum
power
applied
from
exceeding
safe
levels.
NOTE
If
the
panel
gauge
has
been
checked
and
found
OK
and
the
suction
gauge
reading
does
not
repeat
within
the
range
of
4.8
to 5.1.
inches
of mercury,
then
the
regulating
valve
should
be
changed.
Observe
the
usual
precautions
for
maintaining
system
cleanliness
to
avoid
premature
pump
service.
Trouble
Cause
Remedy
No suction
gauge
indi-
cation
at instrument.
Filter
clogged
or
dirty.
Replace
filter.
Line
from
gyro
to
filter
restricted.
Check
line.
I
Faulty
gauge.
Malfunctioning
pump.
Replace
gauge.
Replace
pump.
No
suction
gauge
indi-
cation
at instrument
or source.
Revised: 7/15/81
INSTRUMENTS
2E6

Piper Lance II Specifications

General

Manufacturer	Piper Aircraft
Max Takeoff Weight	3, 600 lb (1, 633 kg)
Crew	1
Horsepower	300 hp
Seats	6
Length	27 ft 7 in (8.41 m)
Capacity	5 passengers