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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