Developing Electrical Wiring Interconnect Systems (EWIS) Procedures
Whilst many organisations have procedures related to Fuel Tank Safety processes, there are considerably less in respect of processes and practices related to Electrical Wiring Interconnect Systems.
What Procedures should we consider?
a) Procedures in respect of Tripped Circuit Breakers and how we will manage the associated trouble shooting activities. To ensure that Flight Crew never reset circuit breakers (or reset circuit breakers) unless the procedure is a direct “in flight” instruction driven by documentation available on board the aircraft for example as an OPS Manual procedure.
To also ensure that ground support personnel carry out trouble shooting before proceeding to reset a circuit breaker as simply resetting without additional maintenance activity may be a pre-cursor to a more serious problem and even subsequently a fire.
b) Procedures in respect of the Maintenance of Inspection Standards and how these standards should be applied. It is often assumed that a maintenance engineer automatically understands how to inspect an aircraft. But this is a skill like any other which needs to be both taught and understood. It is moreover the obligation of the maintenance organisation to ensure that the competence of the aircraft inspectors is managed in an effective way.
c) Procedures regarding the Management and Training associated with EWIS Tooling, how this process is managed to ensure that the work is performed and delivered to the highest standards.
Different tooling requires specific training and demonstration of satisfactory understanding, much of this information is available in both the Standard Wiring Practices Manual and vendor support documentation.
d) Cleaning Procedures for EWIS directly and for the cleaning of Zones in which EWIS is present. Note that Fluids with a high PH value may cause chemical breakdown of the insulation material or swelling of the insulation material.
Typically cleaning activities are performed by entry level staff who may not have the necessary awareness of the impact there activities may be having on the aircraft wiring or the associated systems – this information should be understood and trained.
e) Wiring Installation Procedures to be adopted during the installation of modifications include acceptable bend radius and the use of tie wraps and P clips and other securing elements.
f) The use of Anti icing fluids in the region of EWIS - Anti Icing Fluids can make electrical wiring sticky and become a catalyst for degradation, appropriate steps need to be taken to ensure this exposure is minimized.
g) Care and concern of EWIS during maintenance activities note that EWIS should not be used as hand holds or for supporting tooling and test equipment for example lighting. Mechanical stress and strains which are imparted to the wiring looms may induce yielding or fatigue, accelerate other stresses.
EWIS Initial and Recurrent training courses are available either classroom based with Sofema Aviation Services or as online training through SofemaOnline.com
SofemaOnline EWIS Initial training is available here for 117.50 USD per delegate and includes voice over.
About this course
Course type: Presentation with voice over
Approximate duration: up to 14 hours training
Category: EWIS
Price: 117.50 USD
EWIS Recurrent training is available here for 77.50 USD per delegate and includes voice over.
About this course
Course type: Presentation with voice over
Approximate duration: up to 7 hours training
Category: EWIS
Price: 77.50 USD
You can also benefit from our discounts for multiple enrollments.
If you have any questions regarding SofemaOnline please email us at online@sassofia.com
