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AC 43.13-1B CHG 1 9/27/01 e. Check wiring that shows evidence of overheating (even if only to a minor degree) for the cause of the overheating. f. Wiring on which the insulation has be- come saturated with engine oil, hydraulic fluid, or another lubricant. g. Wiring that bears evidence of having been crushed or severely kinked. h. Shielded wiring on which the metallic shield is frayed and/or corroded. Cleaning agents or preservatives should not be used to minimize the effects of corrosion or deteriora- tion of wire shields. i. Wiring showing evidence of breaks, cracks, dirt, or moisture in the plastic sleeves placed over wire splices or terminal lugs. j. Sections of wire in which splices occur at less than 10-foot intervals, unless specifi- cally authorized, due to parallel connections, locations, or inaccessibility. k. When replacing wiring or coaxial ca- bles, identify them properly at both equipment and power source ends. l. Wire substitution-In the repair and modification of existing aircraft, when a re- placement wire is required, the maintenance manual for that aircraft should first be re- viewed to determine if the original aircraft manufacturer (OAM) has approved any sub- stitution. If not, then the OAM should be contacted for an acceptable replacement. m. Testing of the electrical and chemi- cal integrity of the insulation of sample wires taken from areas of the aircraft that have expe- rienced wiring problems in the past, can be used to supplement visual examination of the wire. The test for chemical integrity should be specific for the degradation mode of the insu- lation. If the samples fail either the electrical or chemical integrity tests, then the wiring in the area surrounding the sampling area is a candidate for replacement. 11-98. TERMINALS AND TERMINAL BLOCKS. Inspect to ensure that the follow- ing installation requirements are met: a. Insulating tubing is placed over termi- nals (except pre-insulated types) to provide electrical protection and mechanical support and is secured to prevent slippage of the tubing from the terminal. b. Terminal module blocks are securely mounted and provided with adequate electrical clearances or insulation strips between mounting hardware and conductive parts, ex- cept when the terminal block is used for grounding purposes. c. Terminal connections to terminal module block studs and nuts on unused studs are tight. d. Evidence of overheating and corro- sion is not present on connections to terminal module block studs. e. Physical damage to studs, stud threads, and terminal module blocks is not evident. Replace cracked terminal strips and those studs with stripped threads. f. The number of terminal connections to a terminal block stud does not exceed four, unless specifically authorized. g. Shielding should be dead-ended with suitable insulated terminals. h. All wires, terminal blocks, and indi- vidual studs are clearly identified to corre- spond to aircraft wiring manuals. Page 11-46 Par 11-97PDF Image | AFS-640
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