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AC 43.13-1B CHG 1 (6) missing or poor sealant at base of antenna (7) correct installation (8) signs of corrosion, and (9) the condition of paint/bonding and grounding. (10) Check the bonding of each antenna from mounting base to the aircraft skin. Tol erance: .1 ohm, maximum. (a) Test Equipment: 1 1502B Metallic Time Domain Reflectometer or equivalent. 2 Thruline Wattmeter. (b) Perform the antenna evaluation check using the domain reflectometer to de termine the condition of the antenna and coax cables. Refer to manufacturer’s maintenance procedures. (c) Use thruline wattmeter as needed for addition evaluation. Refer to manufac turer’s maintenance procedures. Check for the following: 1 Resistance. 2 Shorts. 3 Opens. c. Inspect the static dischargers/wicks for: (1) physical security of mounting at tachments, wear or abrasion of wicks, missing wicks, etc., 9/27/01 (2) assurance that one inch of the inner braid of flexible vinyl cover wicks extends be yond the vinyl covering, (3) assurance that all dischargers are present and securely mounted to their base, (4) assurance that all bases are securely bonded to skin of aircraft in order to prevent the existence in voltage level differences be tween two surfaces, (5) signs of excessive erosion or dete rioration of discharger tip, (6) lighting damage as evidenced by pitting of the metal base, and (7) megohm value of static wick itself as per manufacturer’s instructions. It should not be open. d. Subsequent inspection must be made after a maintenance action on a transponder. Refer to Title 14 of the Code of Federal Regulations (14 CFR) part 91, sections 91.411 and 91.413. e. Inspection of the emergency locator transmitter operation, condition and date of the battery. f. Perform a function check of the radio by transmitting a request for a radio check. Perform a function check on navigation equipment by moving the omni bearing selec tion (OBS) and noting the needle swing and the TO/FROM flag movement. 12-10. COMMUNICATION SYSTEMS. Ground operation of communication systems in aircraft may be accomplished in accordance with the procedures appropriate for the airport and area in which the test is made and the manufacturer’s manuals and procedures. Check system(s) for side tone, clarity of Page 12-4 Par 12-9PDF Image | AFS-640
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