AIRCRAFT
SA 160
AIRCRAFTA I R C R A F T
Symphony
7.41 VACUUM SYSTEM
The vacuum system is provided to operate the air driven directional and
attitude gyro instruments. The systems consists of an engine driven
vacuum pump, a vacuum relief valve, filters, a vacuum suction gauge,
andthenecessaryconnectingtubing(SeeFig. 7-17).
The dry-type air vacuum pump is flanged on the upper rear engine
accessory case. A shear drive protects the pump from damage. If the
vacuum pump fails or the drive shears, the air driven directional and
attitudegyroswillbecomeinoperative.
Avacuumgauge,placed on the upper left instrument panel, provides the
pilot with the system vacuum pressure during operation. A prolonged
pressure decrease in the system over an extended period may indicate a
dirty filter, dirty screens, a sticky vacuum regulator, or a leakage in the
system. Zero pressure would indicate a sheared pump drive, a failed
pump, a defective gauge, or a collapsed line. In the event of any gauge
variation from the normal, the system should be checked by an
authorized mechanic to prevent possible damage to system components
Alternate Static Source (IFR)
An alternate static pressure source valve is installed on the left
instrument panel. This valve supplies static pressure from inside the
cabininsteadoftheexternalstaticports.
If a blockage in the standard static system is suspected due water or ice,
thealternatestaticsourcevalveshouldbeturned on.
Whenever the alternate static pressure source is selected, refer to
airspeed calibration table (Alternate Static Source) in Section 5 for the
corrections to be applied.
SECTION 7
DESCR. & OPERATION
Feb 25, 2005
7-50
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