```mermaid
flowchart TD
A[Vacuum air filter] --> B[Analog heading indicator]
A --> C[Analog attitude indicator]
A --> D[Suction gauge]
B --> E[Vacuum relief valve]
C --> E
D --> C
E --> F[Vacuum Pump]
F --> G[Overboard vent line]
```
```mermaid
graph TD
A[Vacuum air filter] --> B[Attitude Indicator];
C[Vacuum Transducer] --> B;
C---D[Engine and Airframe Unit];
```