Section 12. ELECTRICAL AND ELECTRONIC SYMBOLS



1 Section 20. ELECTRICAL AND ELECTRONIC SYMBOLS

1 GENERAL. The electrical and electronic symbols shown here are those that are likely to be encountered by the aviation maintenance technician. They are in accordance with ANSI-Y32.2-1975.

2 SYMBOLS. Only those symbols associated with aircraft electrical and electronic wiring have been listed in general. Refer to ANSI-Y32.2-1975 for more specific detail on each symbol.

1 Table 11-27. Electronic/Electrical Symbols.

|Symbol |Meaning |

|[pic] | |

| |Adjustability Variability |

|[pic] |Radiation Indicators |

|[pic] |Physical State Recognition |

|[pic] |Test-Point Recognition |

|[pic] |Polarity Markings |

|[pic] |Direction of Flow of Power, Signal, or Information |

|[pic] | |

| |Kind of Current |

|[pic] |Envelope Enclosure |

|[pic] |Shield Shielding |

|[pic] |Special Connector or Cable Indicator |

2 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] |Resistor |

|[pic] |Capacitor |

|[pic] | |

| |Antenna |

|[pic] |Battery |

|[pic] |Thermal Element Thermomechanical Transducer |

|[pic] |Thermocouple |

|[pic] |Spark gap Ignitor gap |

|[pic] |Continuous Loop Fire Detector (temperature sensor) |

|[pic] |Ignitor Plug |

3 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] | |

| | |

| | |

| | |

| | |

| |Transmission Patch |

| |Conductor |

| |Cable |

| |Wiring |

|[pic] |Distribution Lines |

| |Transmission lines |

|[pic] |Alternative or Conditioned Wiring |

|[pic] |Associated or Future |

4 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] |Intentional Isolation of Direct-Current Path in Coaxial or |

| |Waveguide Applications |

|[pic] |Waveguide |

|[pic] |Strip-Type Transmission Line |

|[pic] |Termination |

|[pic] |Circuit Return |

|[pic] |Pressure-Tight Bulkhead Cable |

| |Gland |

| |Cable Sealing End |

|[pic] | |

| |Switching Function |

|[pic] | |

| |Electrical Contact |

5 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] | |

| | |

| | |

| |Basic Contact Assemblies |

|[pic] | |

| |Magnetic Blowout Coil |

|[pic] |Operating Coil |

| |Relay Coil |

|[pic] | |

| |Switch |

|[pic] |Pushbutton, Momentary, or Spring-Return |

6 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] |Two-Circuit, Maintained, or Not Spring-Return |

|[pic] |Nonlocking Switching, Momentary, or Spring-Return |

|[pic] | |

| |Locking Switch |

|[pic] |Combination Locking and Nonlocking Switch |

|[pic] |Key-Type Switch |

| |Lever Switch |

7 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] | |

| | |

| | |

| | |

| | |

| |Selector or Multiposition Switch |

|[pic] |Safety Interlock |

|[pic] |Limit Switch |

| |Sensitive Switch |

|[pic] | |

| |Switches with Time-Delay Feature |

|[pic] |Flow-Actuated Switch |

8 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] |Liquid-Level Actuated Switch |

|[pic] |Pressure- or Vacuum-Actuated Switch |

|[pic] |Temperature-Actuated Switch |

|[pic] | |

| |Thermostat |

|[pic] |Flasher |

| |Self-interrupting Switch |

|[pic] |Foot-Operated Switch |

| |Foot Switch |

|[pic] | |

| |Switch Operated by Shaft Rotation and Responsive to Speed or |

| |Direction |

|[pic] | |

| |Switches with Specific Features |

9 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] |Governor |

| |speed regulator |

|[pic] | |

| | |

| | |

| |Relay |

|[pic] |Inertia Switch |

|[pic] |Mercur Switch |

|[pic] | |

| | |

| | |

| |Terminals |

10 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] | |

| |Cable Termination |

|[pic] | |

| |Connector |

| |Disconnecting Device |

|[pic] | |

| |Connectors of the Type Commonly Used for Power-Supply |

| |Purposes |

|[pic] | |

| |Test Blocks |

|[pic] | |

| |Coaxial Connector |

|[pic] |Waveguide Flanges |

| |Waveguide Junction |

11 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] | |

| | |

| |Fuse |

|[pic] |Lightning Arrester |

| |Arrester |

| |Gap |

|[pic] | |

| |Circuit Breaker |

|[pic] | |

| |Protective Relay |

|[pic] | |

| |Audible-Signaling Device |

|[pic] | |

| |Microphone |

12 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] | |

| |Handset |

| |Operator’s Set |

|[pic] | |

| |Lamp |

|[pic] | |

| |Visual-Signaling Device |

|[pic] |Mechanical Connection |

| |Mechanical Interlock |

|[pic] | |

| |Mechanical Motion |

|[pic] | |

| |Clutch Brake |

13 Table 11-27. Electronic/Electrical Symbols (continued).

|Symbol |Meaning |

|[pic] |Manual Control |

|[pic] |Gyro |

| |Gyroscope |

| |Gyrocompass |

|[pic] |Position Indicator |

|[pic] | |

| |Fire Extinguisher Actuator Head |

|[pic] | |

| |Position Transmitter |

|[pic] | |

| |Radio Station |

|[pic] | |

| |Space Station |

|[pic] | |

| |Integrated Circuit |

|[pic] | |

| |Amplifiers |

|[pic] | |

| | |

| |Logic Gates |

|[pic] |Diode |

|[pic] | |

| | |

| |Transistor Symbols |

11-273.(11-283. [RESERVED.]

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