| Aircraft wires inspection. | | | | fittings, and proper clamping. Inspect for distortion, |
| Inspection of wiring and cable integrity should be | | | | adequate drain points which are free of dirt, grease, |
| done by inspecting interconnecting wiring, aircraft | | | | or other obstructions, and freedom from abrasion or |
| cables installation, and conduit between various pieces | | | | damage due to moving objects such as aircraft |
| of electronic equipment to determine that they do | | | | control cables or shifting cargo. |
| not rub against the airframe or each other under | | | | PLASTIC WIRE SLEEVING. Inspect plastic wire |
| vibration conditions encountered in flight. Inspect | | | | sleeving for damage due to abrasion, solvents, or |
| open wiring and cabling for fraying, damage or | | | | hydraulic fluids. |
| distortion resulting from heavy objects being placed | | | | ELECTRICAL TAPE. The chemical base of most |
| on them, being stepped on, or being used as | | | | plastic electrical tape is polyvinylchloride (PVC). This |
| handholds. | | | | tape is not flame resistant unless it is specially |
| PROTECT FROM FLUIDS. Separate aircraft wires or | | | | processed to make it so. Some manufacturers are |
| cables from flammable fluids lines or those which | | | | producing flame-resistant PVC tape and have |
| carry fluids which have a deteriorating effect on wire | | | | obtained Fire Underwriter's Laboratory (UL) approval |
| insulation. Wiring or cables should be routed above | | | | which is shown on the wrapping of the container. |
| such lines and securely clamped to the aircraft | | | | Unless the tape shows such approval, it should not |
| structure. An arcing fault between an electric cable | | | | be used until its flame resistance properties have |
| and a fluid line may puncture the line and result in a | | | | been determined. A simple test can be made by |
| fire. | | | | applying a flame to a sample of unknown tape and |
| Aircraft wiring replacement. | | | | comparing its burning qualities to a sample of |
| WIRE AND CABLE CLAMPS. Inspect aircraft wire and | | | | flame-resistant tape. |
| cable clamps for proper tightness. Where cables pass | | | | High temperature fire resistant cable |
| through structure or bulkheads, inspect for proper | | | | Flame resistant or not, PVC will decompose at |
| clamping or grommets. Inspect for sufficient slack | | | | temperatures above 221* F. (105° C.) with rapid loss |
| between the last clamp and the electronic equipment | | | | of insulating qualities. It is not recommended for use |
| to prevent strain at the cable terminals and minimize | | | | in compartments where temperatures normally |
| adverse effects on shock mounted equipment. | | | | approach 221° F. (105° C.) nor in designated fire |
| CONDUIT. Conduit is manufactured in metallic and | | | | zones unless precautions are taken to prevent short |
| nonmetallic materials and in both rigid and flexible | | | | circuits to the airframe, shielded wires in bundles, or |
| forms. Primarily its purpose is for mechanical | | | | any other electrical ground, in the event of |
| protection of the cable within. Inspect conduit for | | | | decomposition. Of course, high temperature fire |
| proper end fittings, absence of abrasion at the end | | | | resistant cable should be used wherever possible. |