EWIS TG 1, 2 & 3 Continuation

The aviation industry is continuously improving when it comes to safety.

As bad as it is, lessons are learned with every incident or accident, big or small. The cause of it is analyzed and procedures are drawn up or changed on the basis of this. One of the results of such an analysis can be that there is a need for training, to create or increase awareness for a certain matter for example. One such training is EWIS.

Following EWIS training is set mandatory by the aviation authorities. If you don’t follow this course, you won’t be allowed to practice your passion: working on the Aircraft.

This continuation training is custom made to meet the requirements given by the aviation authorities for Target Group 1, 2 and 3.

Target group 1: Qualified staff performing EWIS maintenance

Target Group 2: Qualified staff performing maintenance inspections on EWIS.

Target group 3: Qualified staff performing electrical/avionic engineering on in-service aeroplanes.

The training consist of the following modules:

• Module A: General EWIS Practices.
• Module B: Wiring Practices Documentation.
• Module C: Inspections.
• Module D: Housekeeping.
• Module E: Wire.
• Module F: Connective Devices.

Detailed Learning Objectives and Topic Overview per Module

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Module A: General EWIS Practices

Learning Objectives:

• Know the safety procedures of normal and non-normal maintenance procedures so that the person can protect himself/herself and the aeroplane.
• Recognize ESDS equipment and demonstrate standard anti-static procedures so that no damage occurs to that equipment.
• Demonstrate the correct use of hand tools including specialized and automated tools and equipment.
• Verify the calibration of electrical measuring instruments, tools and equipment so that correct maintenance procedures may be carried out.
• Demonstrate the process and procedures to successfully use the troubleshooting procedures and charts of current aeroplane faults and know re-occurring problems causing “no fault found” on removed LRU.
• Demonstrate the correct use of electrical meters for measuring voltage, current, resistance, continuity, insulation and short to ground.
• Know the removal and replacement techniques so that no damage will occur to the LRU or aeroplane connector.

Detailed Topic Overview:

1. Safety Practices
   • Current is lethal – first aid
   • Applying power to the aeroplane
   • Isolating the circuit
   • Aeroplane warnings
   • Human factors
2. ESDS device handling and protection
   • Sources of electrostatic discharge
   • Soft and hard failures
   • ESDS safety procedures
   • ESDS handling/packing procedures
3. Tools, special tools and equipment
   • General hand tools
   • Specialized tools
   • Automated tools and equipment
4. Verify calibration/certification of instruments, tools and equipment
   • Tools requiring certification
   • Determining certification requirements
   • Typical problems
5. Required wiring checks using the troubleshooting procedures and charts
   • Troubleshooting procedures manual (all chapters)
   • Aeroplane maintenance manual/illustrated parts catalogue
   • Wiring schematics/troubleshooting graphics
   • Wiring diagrams
   • The process of troubleshooting
   • Testing of LRU connectors
   • Troubleshooting exercises
   • Company “no fault found” policy and data
6. Measurement and troubleshooting using meters
   • Voltage, current and resistance
   • Continuity
   • Insulation
   • Short to ground
   • Loop impedance
7. LRU replacement – general practices
   • Different retention devices
   • Certification considerations (e.g. Cat 2/cat3 landing)
   • LRU re-racking procedures
   • “no fault found” data (aeroplane specific)
   • Built-in test equipment (BITE)

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Module B: Wiring Practices Documentation

Learning Objectives:

• Know the applicable sub-chapters and section to follow during normal and non- normal electrical maintenance procedures.
• Demonstrate the use of the cross-reference index, chapter table of contents, and subject tables of contents so as to find specific material within each sub-chapter and section.
• Demonstrate the use of the associated tables for replacement of wire, connective devices and contacts, and associated components, including approved replacements.
• Demonstrate the use of the wiring diagram manual.
• Demonstrate the use of other documentation.

Detailed Topic Overview:

1. Chapter 20 structure/overview
   • Table of contents
   • Sub-chapter titles
   • Section structure
   • General procedures
2. Chapter 20 cross-reference index
   • Cross-reference index – alphanumeric
   • Cross-reference index – standard part number
   • Cross-reference index – suppliers                            
   • Equivalence tables – std part numbers EN-ASN-NSA
3. Chapter 20 important data and tables
   • Contact crimp tools, insertion/extraction tools
   • Wire insulation removal tools
   • Electrical cable binding
   • Wire type codes and part numbers identification
   • Connective devices types and contacts
   • Terminal blocks and terminations
   • Terminal blocks modules, grounding modules and contacts
   • Cleaning procedures
   • Repair procedures
4. Wiring diagram manual (WDM)
   • Front matter
   • Diagrams
   • Charts
   • Lists
5. Other documentation

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Module C: Inspections

Learning Objectives:

• Know the different types of inspections: general visual inspection (GVI), detailed inspection (DET), zonal inspection and enhanced zonal analysis procedure (EZAP).
• Know the criteria and standards of inspection so that the person knows which tools are used to ensure inspection procedures and standards are achieved, which leads to all defects being found.
• Know the effects of fatigue and complacency during inspection and how to combat these effects (human factors).
• Know the specific zonal inspection requirements related to system affiliation and environmental conditions.
• Recognize typical wiring system damage, such as hot gas, fluid contamination, external mechanically induced damage, chafing, corrosion, signs of overheating of wire, wire bundles, connective and control device assemblies.

Detailed Topic Overview:

1. Special inspections
   • General visual inspection (GVI)
   • Detailed inspection (DET)
   • Zonal inspection
   • Enhanced zonal analysis procedure (EZAP)
2. Criteria and standards
   • Tools
   • Criteria/standards
   • Procedures of inspection
3. Human factors in inspection
   • Fatigue
   • Complacency
4. Zonal areas of inspection
   • Zonal areas of inspection
   • Zonal inspection procedures and standards
5. Wiring system damage
   • Swarf/FOD/metal shavings
   • External mechanically induced damage
   • Hot gas
   • Fluid contamination
   • Vibration/chafing
   • Corrosion
   • Signs of overheating

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Module D: Housekeeping

Learning Objectives:

• Recognize external contamination and other damage due to external environmental conditions.
• Know the aeroplane internal contamination sources so that inspection processes can be effectively carried out and contamination damage easily recognized.
• Recognize other possible contamination sources.
• Know the planning procedures to be followed, on EWIS areas in different parts of the aeroplane.
• Know the protection procedures and processes to protect the EWIS during maintenance and repair.
• Know the process of cleaning wiring systems during maintenance and repair.

Detailed Topic Overview:

1. Aeroplane external contamination sources
   • De-ice fluids
   • Water and rain
   • Snow and ice
   • Miscellaneous (e.g. Cargo/beverage spillage)
   • Air erosion
2. Aeroplane internal contamination sources
   • Hydraulic oils
   • Engine and APU oils
   • Fuel
   • Greases
   • Galleys and toilets
   • Lint/dust
   • Bleed air and hot areas
   • Hazardous materials
3. Other contamination sources
   1. Paint
   2. Corrosion inhibitor
   3. Drill shavings/swarf
   4. Foreign objects (screws, washers, rivets, tools, etc.)
   5. Animal waste
4. Contamination protection planning
   • Have a plan/types of plan/area mapping
   • Protection and caution recommendations
   • Procedures
   • Keep cleaning
5. Protection during aeroplane maintenance and repair
   • Recommended general maintenance protection procedures
   • Recommended airframe repair protection procedures
   • Recommended powerplant repair protection procedures
6. Cleaning processes
   • Fluid contamination
     • snow and ice
     • de-ice fluid
     • cargo spillage
     • water and rain
     • galleys
     • toilets water waste
     • oils and greases
     • pressure washing
   • Solid contamination
     • drill shavings/swarf
     • foreign objects
   • Environmental contamination
     • lint and dust
     • paint
     • corrosion inhibitor
     • animal waste

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Module E: Wire

Learning Objectives:

• Demonstrate the procedure used to identify specific wire types using the aeroplane manuals.
• Know from approved data different insulation types and their relative qualities.
• Know the inspection criteria for wire and wire bundles.
• Know the standard installation practices for wire and wire bundles.
• Know typical damage that can be found.
• Demonstrate the repair procedures for typical damage found.
• Demonstrate the procedures to fitting differing types of sleeving.
• Know the procedures for termination and storage of unused wires.
• Know the correct installation practices for electrical bonds and grounds.

Detailed Topic Overview:

1. Identification, type and construction
   • Wire type codes – alphanumeric
   • Wire type codes – specification and standard part number
   • Wire type codes – specified wire and alternate
   • Manufacturer identification
2. Insulation qualities
   • Types of insulation
   • Typical insulation damage and limitations
   • Carbon arcing
3. Inspection criteria and standards of wire and wire bundles
   • Inspection of individual wiring
   • Inspection of wire bundles
4. Wire bundle installation practices
   • Routing
   • Segregation rules
   • Clearance
   • Clamp inspection
   • Clamp removal and fitting
   • Conduit types and fitting
   • Raceways
   • Heat shields and drip shields
5. Typical damage and areas found
   • Vibration
   • Heat
   • Corrosion
   • Contamination
   • Personnel traffic passage
6. Maintenance and repair procedures
   • Wire damage assessment and classification
   • Approved repairs – improper repairs
   • Shielded wire repair
   • Repair techniques
   • Terminals and splices
   • Preventative maintenance procedures
7. Sleeving
   • Identification sleeves
   • Shrink sleeves
   • Screen braid grounding crimp sleeves
   • Screen braid grounding solder sleeves
8. Unused wires – termination and storage
   • Termination – end caps
   • Storage and attachment
9. Electrical bonding and grounds
   • Inspection standards
   • Primary bonding (HIRF protection)
   • Secondary bonding (system grounding)
   • Lightning strikes

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Module F: Connective Devices

Learning Objectives:

• Know the general types and positive identification of connective devices.
• Know the various safety procedures, cautions and warnings prior to inspection.
• Know the relevant visual inspection procedures for each type of connector so that any internal or external damage can be found.
• Recognize typical external and internal damage to the connector.
• Demonstrate where to find the relevant repair schemes from chapter 20 for connector repair.

Detailed Topic Overview:

1. General types and identification
   • Part number identification
   • Reference tables
   • Specific connective devices chapters
2. Cautions and protections
   • Safety precautions
   • Maintenance precautions
3. visual inspection procedures
   • Installed inspection criteria
   • Removed inspection criteria
4. Typical damage found
   • Exterior damage
   • Internal damage
5. repair procedures
   • Finding the correct section
   • Finding the correct part
   • Finding the correct tooling
   • Confirming the correct repair

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