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9/8/98 AC 43.13-1B SECTION 10. SERVICE LOOP HARNESSES (Plastic Tie Strips) 11-135. GENERAL. The primary function of a service loop harness is to provide ease of maintenance. The components, mounted in the instrument panel and on the lower console and other equipment that must be moved to access electrical connectors, are connected to aircraft wiring through service loops. Chafing in service loop harnesses is controlled using the following techniques. 11-136. SUPPORT. Only string ties or plastic cable straps in accordance with para- graph 11-158 should be used on service loop harnesses. A 90° or “Y” type spot tie should be installed at the harness breakout point on the harness bundle. Ties should be installed on service loop harnesses at 4 to 6-inch inter- vals. 11-137. ANTI-CHAFING MATERIAL. When service loops are likely to be in contact with each other, expandable sleeving or equivalent chafe protection jacket material must be installed over service loop harnesses to prevent harness-to-harness chafing. The sleeve should be held in place with string ties at 6 to 8-inch intervals. Harness identification labels should be installed, with string tie, within 3 inches of the service loop harness in- stallation. 11-138. STRAIN RELIEF. The strain re- lief components may be installed to control routing where close clearance exists between termination and other components or bulk- heads. Strain relief components provide sup- port of the service loop harness at the termina- tion point. Connector strain relief adapters, heat-shrinkable boot, or a length of heat- shrinkable tubing should be installed. The heat-shrinkable boots will provide preselected angles of wire harness termination when heat is applied. Heat-shrinkable tubing should be held at the desired angle until cool. 11-139. “SERVICE LOOP.” Primary sup- port for service loop harness(es) should be a cushion clamp and a connector at the harness termination. Service loop harnesses should be inspected for the following: a. Adequate Length. Components should extend out from their mounting posi- tion a distance that permits rotating and un- locking (or locking) the electrical connector. Usually a distance of 3 to 6 inches, with all other components installed, should be suffi- cient. b. Bundle BreakOut Point. (1) Bundle breakout point should be adequately supported with string tie. (2) Service loop must maintain a mini- mum bend radius of 3 times the harness di- ameter. (3) The breakout point should be lo- cated directly behind, beside, below, or above the component so that the service loop harness does not bind other components. (4) Plastic ties should not be used be- tween the service loop breakout and the elec- trical connector when they are likely to chafe against adjacent wire. Par 11-135 Page 11-55PDF Image | AFS-640
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