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Aircraft Wiring Condition Aircraft Wiring Condition AwarenessAwareness

Maintaining safe installationsMaintaining safe installations

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Problems that should not be Problems that should not be overlooked.overlooked.

Many different skill groups work on an Many different skill groups work on an aircraft during a heavy maintenance visit aircraft during a heavy maintenance visit and modification projects.and modification projects.

Even technicians that are not part of an Even technicians that are not part of an avionics or electrical specialty crew should avionics or electrical specialty crew should understand the importance of proper understand the importance of proper wiring installations especially in aging wiring installations especially in aging aircraft.aircraft.

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Drill shavings andDrill shavings and debris should not be debris should not be allowed to fall on wiring.allowed to fall on wiring.

These bundles also These bundles also appear to have corrosion appear to have corrosion preventative compound preventative compound (CPC) caked on (CPC) caked on some areas.some areas.

FOD landing on the wire runsFOD landing on the wire runs

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CPC should not be applied or allowed to drip on wiring. CPC should not be applied or allowed to drip on wiring. Wiring should be covered when necessary when CPC is Wiring should be covered when necessary when CPC is

appliedapplied..

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This wiring should be cleaned and covered if any repairs This wiring should be cleaned and covered if any repairs are being accomplished to the surrounding structure.are being accomplished to the surrounding structure.

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Inadequate separation between runs.Inadequate separation between runs.

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Lack of proper support and clearance; wiring Lack of proper support and clearance; wiring should not contact the structure. should not contact the structure.

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Correct clamp and standoff Correct clamp and standoff installationinstallation

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Wire clamps and supports should Wire clamps and supports should not pinch or pull the wires.not pinch or pull the wires.

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Poor clamp fit and installationPoor clamp fit and installation

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Damage to wires can occur in this Damage to wires can occur in this situation. situation.

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This happens too often when technicians do not This happens too often when technicians do not pay close attention to their work.pay close attention to their work.

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Wrong size or damaged clamps Wrong size or damaged clamps can be warped.can be warped.

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Notice the clamp ends joining Notice the clamp ends joining neatly into a nice secure fit.neatly into a nice secure fit.

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Corroded Cannon PlugCorroded Cannon Plug

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Improper routing and securitycaused a fire!

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Always check clearance and support.

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Poor practices caused a fire!Poor practices caused a fire!

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Inadequate clearance and poor securityInadequate clearance and poor security

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Did not follow the manual!Did not follow the manual!

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Again no clearance!Again no clearance!

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The investigation of the TWA Flight 800 fuel tank explosion

uncovered possible damaged and degraded wiring.

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Improvements in Wire SystemIntegrity can be achieved by increased awareness by all

Maintenance Technicians.

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You just might prevent a tragedy You just might prevent a tragedy