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b. The presence of a foreign material that is capable of sustaining combustion
after removal of ignition source.
The contaminant may be in solid or liquid form. Solid contaminants such as metal
shavings, swarf, debris, livestock waste, lint and dust can accumulate on wiring and
may degrade or penetrate wiring or electrical components.
Chemicals in fluids such as hydraulic fluid, battery electrolytes, fuel, corrosion
inhibiting compounds, waste system chemicals, cleaning agents, deicing fluids,
paint, soft drinks and coffee can contribute to degradation of wiring.
Hydraulic fluids, deicing fluids and battery electrolyte require special consideration.
These fluids, although essential for aircraft operation, can damage connector
grommets, wire bundle clamps, wire ties and wire lacing, causing chafing and
arcing. Wiring exposed to these fluids should be given special attention during
inspection. Contaminated wire insulation that has visible cracking or breaches to
the core conductor can eventually arc and cause a fire. Wiring exposed to, or in
close proximity to, any of these chemicals may need to be inspected more
frequently for damage or degradation.
When cleaning areas or zones of the aircraft that contain both wiring and chemical
contaminants, special cleaning procedures and precautions may be needed. Such
procedures may include wrapping wire and connectors with a protective covering
prior to cleaning. This would be especially true if pressure washing equipment is
utilized. In all cases the aircraft manufacturer recommended procedures should be
followed.
Waste system spills also require special attention. Service history has shown that
these spills can have detrimental effects on aircraft EWIS and have resulted in
smoke and fire events. When this type of contamination is found all affected
components in the EWIS should be thoroughly cleaned, inspected and repaired or
replaced if necessary. The source of the spill or leakage should be located and
corrected.
• Heat - Exposure to high heat can accelerate degradation of wiring by causing
insulation dryness and cracking. Direct contact with a high heat source can quickly
damage insulation. Burned, charred or even melted insulation are the most likely
indicators of this type of damage. Low levels of heat can also degrade wiring over a
longer period of time. This type of degradation is sometimes seen on engines, in
galley wiring such as coffee makers and ovens, and behind fluorescent lights,
especially the ballasts.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
Appendix E Causes of Wiring Degradation 49
Technical Training
Detailed Course Descriptions
A330 (RR RB211Trent)
A330 (RR RB211Trent), T1: Part-66 Cat. B1, Line & Base Maintenance .................................. 2
A330 (RR RB211Trent), T2: Part-66 Cat. B2, Line & Base Maintenance .................................. 3
A330 (RR RB211Trent), T1/T2: Part-66 Cat. B1/B2, Line & Base Maintenance ....................... 4
A330 (RR RB211Trent), T3: Part-66 Cat. A, Ramp & Transit .................................................... 5
A330 (RR RB211Trent), T4: Part-66 Cat. C, General Familiarization........................................ 6
A330 (RR RB211Trent) vs. A340 (CFM56),
T1/T2: Part-66 Cat. B1/B2, Line & Base Maintenance............................................................... 7
Course Descriptions A330 (RR RB211Trent)
A330 (RR RB211Trent), T1: Part-66 Cat. B1, Line & Base Maintenance
Electrical Systems, Airframe & Powerplant – ATA Spec 104 Level 3
Avionics Systems – ATA Spec 104 Level 2
Duration: 30 days / 210 lessons theoretical training
14 days / 98 hours practical training
Target Group: Part-66 Category B1: Line and Base Maintenance Technician - mechanical
Content: This course covers Airframe, Engine and Electrical elements in detail to ATA specification
104 Level 3 and Avionics Systems Level 2.
Training includes:
• Description and operation of airframe, engine, electrical and avionics systems.
• Description and operation of controls and indicators.
• Identification and location of the main components
• Servicing of the airframe, engine and electrical systems in accordance with aircraft
maintenance manuals
• Troubleshooting of the airframe, engine and electrical systems with the use of
built-in devices
• Operational testing of the airframe, engine and electrical systems
• Servicing and minor troubleshooting of the avionics with the use of built-in-test devices
Number of Theoretical Minimum: 8 Practical Minimum: 4
Participants: Maximum: 15 Maximum: 6
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