TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning Intentional Isclation of Direct-Current Path in Coaxial or Waveguide Applications Waveguide Strip-Type Transmission Line Temination + 0411 Circuit Return Fressure-Tight Bulkhead Cable Gland Cable Sealing End Switching Function
- > • 11L Electrical Contact Par 11-272 Page 11-124
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning 7706779 It to for fis fine Basic Contact Assemblies 177- Magnetic Blowout Coil Operating Coil Relay Coil J_
• Switch -.
ale ale Pushbutton, Momentary, or Spring- Retum Par 11-272 Page 11-125
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning ojo Two-Circuit, Maintained, or Not Spring- Return Nonlocking Switching, Momentary, or Spring-Retur Locking Switch Combiration Locking and Nonlocking Switch Key-Type Switch Lever Switch Par 11-272 Page 11-126
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning 8000 .... 29000 Selector or Multiposition Switch Safety Interlock a te Sensitive Switch Limit Switch 11100 Switches with Time-Delay Feature Flow-Actuated Switch Par 11-272 Page 11-127
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning Liquid-Level Actuated Switch Pressure- or Vacuum-Actuated Switch Temperature-Actuated Switch Thermostat Flasher Self-Interrupting Switch Foot-Operated Switch Foot Switch Switch Operated by Shaft Rotation and Responsive to Speed or Direction Chai aIo Switches with Specific Features Par 11-272 Page 11-128
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning Governor Speed Regulator
AC D DP MC
I P DB EP NB ) SO SA SW ) SR L ML FR · Relay Inertia Switch Mercur Switch Terminals Par 11-272 Page 11-129
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning Cable Termination → Connector Disconnecting Device Connectors of the Type Commonly Used for Power-Supply Purposes Test Blocks Coaxial Connector Waveguide Flanges Waveguide Junction Par 11-272 Page 11-130
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning Fuse Lightning Arrester Arrester Gap Circuit Breaker
- CC Protective Relay F S GP T =00 Audible-Signaling Device Microphone Par 11-272 Page 11-131
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning Handset Operator's Set Lamp ₩ Visual-Signaling Device Mechanical Connection Mechanical Interlock Mechanical Motion ~ Clutch Brake Par 11-272 Page 11-132
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Symbol Meaning Manual Control Gyro Gyposcope Gyrocompass Position Indicator Fire Extinguisher Actuator Head Position Transmitter Radio Station a 5· Space Station Par 11-272 Page 11-133
TABLE 11-29. ELECTRONIC/ELECTRICAL SYMBOLS (CONTINUED) Integrated Circuit Amplifiers
GENERAL SYMBOLS MAGNETIC AMPLIFIER
INVERTOR OR
NOT GATE AND GATE WITH THREE INPUTS NAND (NOT AND) GATE Logic Gates
OR GATE NOR (NOT OR) GATE
EXCLUSIVE OR GATE Diode
EMITTER BASE COLLECTOR Transistor Symbols
EMITTER BASE COLLECTOR E - C N
11-273.-11-283. [RESERVED.] Par 11-272 Page 11-134
Par 12-1 Page 12-1 CHAPTER 12. AIRCRAFT AVIONICS SYSTEMS SECTION 1. AVIONICS EQUIPMENT MAINTENANCE
12-1. GENERAL. There are several methods of ground checking avionics systems.
a. Visual Check. Check for physical condition and safety of equipment and components.
b. Operation Check. This check is performed primarily by the pilot, but may also be performed by the mechanics after annual and 100-hour inspections. The Aircraft Flight Manual (AFM), the Airman’s Information Manual (AIM), and the manufacturer’s information are used as a reference when performing the check.
c. Functional Test. This is performed by qualified mechanics and repair stations to check the calibration and accuracy of the avionics with the use of test equipment while they are still on the aircraft, such as the transponder and the static checks. The equipment manufacturer’s manuals and procedures are used as a reference.
d. Bench Test. When using this method the unit or instrument is removed from the aircraft and inspected, repaired, and calibrated as required.
e. Electromagnetic Interference (EMI). For EMI tests, refer to chapter 11, paragraph 11-107 of this AC.
12-2. HANDLING OF COMPONENTS. Any unit containing electronic components such as transistors, diodes, integrated circuits, programmable read-only memory (PROM), Read-Only Memory (ROM), and memory devices should be protected from excessive shocks. Excessive shock can cause internal failures of these components. Most electronic devices are subject to damage by electrostatic discharges (ESD).
CAUTION: To prevent damage due to excessive electrostatic discharge, proper gloves, finger cots, or grounding bracelets should be used. Observe the standard procedures for handling equipment containing electrostatic sensitive devices or assemblies in accordance with the recommendations and procedures set forth in the maintenance instructions set forth by the equipment manufacturers.
12-3.–12-7. [RESERVED.]