Piper Arrow PA-28R-201 Pilot Operating Handbook page 253

SECTION 9
SUPPLEMENT 1
SECTION S PERFORMANCE
No change.
SECTION 6- WEIGHT
Factory installed optional equipment
and balance data in Section 6 of the Basic Pilot's Operating Handbook.
SECTION 7- DESCRIPTION
The auxiliary dry air pump
source of pneumatic power to operate the gyro flight instruments in the event
the engine driven air pump
The auxiliary pump
connects to the primary system at a manifold downstream
regulator. Isolation of the primary and auxiliary systems from each other is
by check valves on each side of the manifold. The primary
accomplished
switch is located in the center of the manifold and senses
system vacuum
vacuum supplied to the gyros.
The control switch (labeled AUX
located on the main
panel above the throttle quadrant. The control switch operating modes
push-for-on and push-for-off.
The switch button incorporates two annunciator light sections labeled
VAC OFF and AUX
switch in the primary pneumatic system and illuminatesan amber light when
the engine driven pump
the switch activationlevel.The AUX
switch in the auxiliary pneumatic system and illuminatesa blue light when
the auxiliarypump
the auxiliary pump
developed air leaks, the AUX
that the system vacuum
even though the auxiliarypump
the vacuum system indicator.
REPORT: VB-1612
9-6 4of6
HB-PQY, Page: 9-6-(0)
& BALANCE
AND OPERATION
system provides an independent
fails
is mounted on the forward side of the firewalland
VAC)
electrical switch panel in the center of the instrument.
ON. The VAC OFF
is inoperative or when the system vacuum
ON
is operating and creating a vacuum
is activated at high altitude, or if the system
ON
lightmay failto illuminate. This indicates
is still b elow the AUX
is operating and can be verified by observing
PA-28R-201,
is included in the licensed weight
for the auxiliarypump
section is controlled by a vacuum
section is controlled by a vacuum
in the system. When
ON switch activationlevel
ISSUED:
JULY
Issued: JULY 12, 1995
ARROW
back-up
of the vacuum
system is
are
faIls below
has
12,1995
9-6