SECTION 7 PIPER AIRCRAFT CORPORATION
DESCRIPTION
& OPERATION PA-28-161, WARRIOR
II
gauge
or
collapsed line. In the event of any gauge variation from the norm,
the
pilot should have a mechanic check the system
to
prevent possible
damage
to the system components
or
eventual failure
of
the system.
A vacuum regulator
is
provided
in
the system to protect the gyros. The
valve
is
set so the normal vacuum reads
4.
8 to
5.1
inches
of
mercury, a setting
which provides sufficient vacuum to operate all the gyros
at
their rated RPM.
Higher settings will damage the gyros and with a low setting the gyros will
be
unreliable. The regulator
is
located behind the instrument panel. Vacuum
pressure, even though set correctly, can read lower
at
very high altitude
(above
12,000 ft), and
at
low engine
RPM
(usually on approach or during
training maneuvers). This
is
normal and should
not
be considered a
malfunction.
REPORT:
VB-1180
7-14
ISSUED: AUGUST 13,
1982
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