Piper WARRIOR III PA-28-161, Руководство по эксплуатации для пилотов

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SECTION 9 PIPER AIRCRAFT CORPORATION
SUPPLEMENT 1 PA-28-161, WARRIOR III
SECTION 9 PIPER AIRCRAFT CORPORATION
SUPPLEMENT 1 PA-28-161, WARRIOR III
REPORT: VB-1565 ISSUED: JULY 1, 1994
9-6
REPORT: VB-1565 ISSUED: JULY 1, 1994
9-6
SECTION 7 - DESCRIPTION AND OPERATION
The auxiliary dry air pump system provides an independent back-up
source of pneumatic power to operate the gyro flight instruments in the
event the engine driven air pump fails.
The auxiliary pump is mounted on the forward side of the firewall and
connects to the primary system at a manifold downstream of the vacuum
regulator. Isolation of the primary and auxiliary systems from each other is
accomplished by check valves on each side of the manifold. The primary
system vacuum switch is located on the regulator and senses vacuum
supplied to the gyros.
A control switch (labeled AUX VAC) for the auxiliary pump system is
located on the right side of the instrument panel near the vacuum suction
gage.
The switch button incorporates two annunciator light sections labeled
VAC OFF and AUX ON. The VAC OFF section is controlled by a vacuum
switch in the primary pneumatic system and illuminates an amber light
when the engine driven pump is inoperative or when the system vacuum falls
below the switch activation level. The AUX ON section is controlled by a
vacuum switch on the manifold and illuminates a blue light when the
auxiliary pump is operating and creating a vacuum in the system. When the
auxiliary pump is activated at high altitude, or if the system has developed
air leaks, the AUX ON light may fail to illuminate. This indicates that the
system vacuum is still below the AUX ON switch activation level even
though the auxiliary pump is operating. The annunciator lights do not
incorporate a press-to-test feature, if the lights do not illuminate as
expected, check for burned out lamps, replace with MS25237-330 bulbs and
retest the system.
System electrical protection is provided by a 20 amp circuit breaker in
the pump motor circuit and a 5 amp circuit breaker in the annunciator light
circuit. The breakers are mounted on the circuit breaker panel.
SECTION 7 - DESCRIPTION AND OPERATION
The auxiliary dry air pump system provides an independent back-up
source of pneumatic power to operate the gyro flight instruments in the
event the engine driven air pump fails.
The auxiliary pump is mounted on the forward side of the firewall and
connects to the primary system at a manifold downstream of the vacuum
regulator. Isolation of the primary and auxiliary systems from each other is
accomplished by check valves on each side of the manifold. The primary
system vacuum switch is located on the regulator and senses vacuum
supplied to the gyros.
A control switch (labeled AUX VAC) for the auxiliary pump system is
located on the right side of the instrument panel near the vacuum suction
gage.
The switch button incorporates two annunciator light sections labeled
VAC OFF and AUX ON. The VAC OFF section is controlled by a vacuum
switch in the primary pneumatic system and illuminates an amber light
when the engine driven pump is inoperative or when the system vacuum falls
below the switch activation level. The AUX ON section is controlled by a
vacuum switch on the manifold and illuminates a blue light when the
auxiliary pump is operating and creating a vacuum in the system. When the
auxiliary pump is activated at high altitude, or if the system has developed
air leaks, the AUX ON light may fail to illuminate. This indicates that the
system vacuum is still below the AUX ON switch activation level even
though the auxiliary pump is operating. The annunciator lights do not
incorporate a press-to-test feature, if the lights do not illuminate as
expected, check for burned out lamps, replace with MS25237-330 bulbs and
retest the system.
System electrical protection is provided by a 20 amp circuit breaker in
the pump motor circuit and a 5 amp circuit breaker in the annunciator light
circuit. The breakers are mounted on the circuit breaker panel.