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2. Remove/Install the Vacuum Pump ...............................................................................201
3. Remove/Install the Vacuum Regulator .........................................................................202
4. Replace the Vacuum Inlet Filter....................................................................................203
5. Adjust the Vacuum Regulator .......................................................................................204
CHAPTER 37-20 VACUUM INDICATING ................................................................................................1
1. General .............................................................................................................................1
TROUBLE-SHOOTING...............................................................................................................101
1. General .........................................................................................................................101
MAINTENANCE PRACTICES ....................................................................................................201
1. General .........................................................................................................................201
2. Remove/Install the Vacuum Gauge..............................................................................201
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CHAPTER 37-00
VACUUM - GENERAL
1. General
Some DA20-C1 aircraft have a vacuum system which supplies power for flight instruments. The
vacuum system only operates when the engine runs. See Chapter 34-20 for data about the attitude
and direction instruments which use the system.
2. Description
Figure 1 shows the vacuum system schematic diagram. The vacuum system has these
components:
A. Vacuum Pump
Four nuts and studs attach the vacuum pump to the front right of the engine at the bottom of the
crankcase. It is a rotary-vane positive-displacement pump. See the manufacturers handbook
for further data about the vacuum pump.
B. Vacuum regulator
The vacuum regulator attaches to the aft face of the firewall at the top left. The outlet pipe from
the regulator goes forward through the firewall. A nut on the outlet pipe holds the vacuum
regulator in position.
The vacuum regulator has 2 inlet ports which connect to the attitude and direction instruments.
A diaphragm in the regulator senses the pressure at the inlet ports. The diaphragm operates a
control valve which can allow air from the cockpit in to the system. A T-bar on the bottom of the
regulator lets you adjust the vacuum. A filter prevents dirt from going into the regulator from the
cockpit.
C. Vacuum Inlet Filter
Air enters the vacuum system through afilter. The filter is located between the firewall and the
instrument panel on the left.
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Figure 1: Vacuum System Schematic Diagram
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D. Vacuum Gauge
A vacuum gauge measures the value of the suction in the system. It is calibrated in inches of
mercury (in Hg).
E. Connections.
A rigid aluminum pipe and a short flexible hose connect the vacuum pump to the regulator.
Flexible hoses connect all other components.
3. Operation
The vacuum pump pulls air through the system.
− The air goes into the system through the inlet filter.
− The air goes through flexible hoses to the attitude indicator, the directional gyro and the
vacuum gauge.
− The air operates the gyros in the attitude indicator and directional gyro.
− The air flows from the attitude indicator and directional gyro to the vacuum regulator.
− The vacuum regulator controls the flow of air into the system from the cockpit so that the
vacuum to the instruments is 4.8 - 5.4 in.Hg.
The vacuum indicator measures the vacuum across the directional gyro.
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CHAPTER 37-10
VACUUM DISTRIBUTION
1. General
See Chapter 37-00 for the system description and operation. This section gives you the troubleshooting
and maintenance procedures for the vacuum distribution system.
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