Vacuum System - Piper PA-46-350P Malibu Mirage Pilot's Manual And Operation Manual

PA-46-350P, MALIBU
7.27 BLEED AIR, CONDITIONING AND PRESSURIZATION SYSTEM
(Continued)
For unpressurized flight the CABIN PRESS control should be pulled
fully out. Setting the CABIN PRESS/DUMP/NORM switch to DUMP will
provide maximum airflow through the cabin. Cabin temperature will continue
to be controlled by the CABIN TEMP control.
For complete instructions on pressurization malfunctions, refer to
Section 3 - Emergency Procedures.

7.29 VACUUM SYSTEM

Vacuum for the system is provided by two continuously operating
engine driven dry air vacuum pumps; one rotating clockwise and one
rotating counterclockwise. Either pump can independently support the
system. Also included are two regulators, a low vacuum switch, an inlet air
filter, and a manifold that connects the autopilot, attitude indicator, cabin
pressure controller, and vacuum solenoid valve. The latter two components
are part of the cabin pressurization system.
The two vacuum regulators are mounted on the forward pressure
bulkhead in the forward baggage compartment
A vacuum gauge and two vacuum failure annunciators (Figure 7-49),
provides information to the pilot regarding the operation of both pumps.
When both pumps are operating, neither annunciator is illuminated. The
No. 1 vacuum failure annunciator will illuminate should the clockwise
rotating pump fail, while the No. 2 vacuum failure annunciator will
illuminate should the counterclockwise rotating pump fail.
Any decrease in system vacuum may indicate a dirty filter, dirty screens,
sticking vacuum regulator, or a leak in the system.
ISSUED: FEBRUARY 23, 1999
SECTION 7
DESCR/OPERATION
REPORT: VB-1710
7-55