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9/27/01 AC 43.13-1B CHG 1 SECTION 2. GROUND OPERATIONAL CHECKS FOR AVIONICS EQUIPMENT (ELECTRICAL) 12-8. GENERAL. When the operating or airworthiness regulations require a system to perform its intended function, the use of the Technical Standard Order (TSO) equipment or the submission of data substantiating the equipment performance is strongly recom mended. An operation check of avionics is the responsibility of the pilot in command. How ever, it is recommended that after replacement of equipment during 100 hour or annual in spections, an operational check of avionics equipment be performed. The accomplish ments of these checks must be done in accor dance with the recommendations and proce dures set forth in the aircraft’s flight manual instructions published by the avionics equip ment manufacturers. (4) Check to assure that the radios and instruments are secured to the instrument panel. (5) Check that all avionics are free of dust, dirt, lint, or any other airborne contami nates. If there is a forced air cooling system, it must be inspected for proper operation. Equipment ventilation openings must not be obstructed. (6) Check the microphone headset plugs and connectors and all switches and controls for condition and operation. Check all avionics instruments for placards. Check lightening, annunciator lights, and cockpit in terphone for proper operation. (7) The circuit breaker panel must be inspected for the presence of placarding for each circuit breaker installed. (8) Check the electrical circuit switches, especially the spring-load type for proper op eration. An internal failure in this type of switch may allow the switch to remain closed even though the toggle or button returns to the OFF position. During inspection, attention must be given to the possibility that improper switch substitution may have been made. b. Inspect antennas for: (1) broken or missing antenna insulators (2) lead through insulators (3) springs (4) safety wires (5) cracked antenna housing 12-9. INSPECTION SYSTEMS. OF A VIONICS a. The inspection shall include the fol lowing: (1) Inspect the condition and security of equipment including the proper security of wiring bundles. (2) Check for indications of overheating of the equipment and associated wiring. (3) Check for poor electrical bonding. The bonding requirements are specified by equipment manufacturers. Installation cabling should be kept as short as possible, except for antenna cables which are usually precut or have a specific length called out at installation. Proper bonding on the order of 0.003 ohms is very important to the performance of avionics equipment. Par 12-8 Page 12-3PDF Image | AFS-640
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