On which basis / requirement the Agency is requesting a STC Applicant to evaluate if a revision to EWIS ICA is necessary?
Answer
New and revised certification specifications were introduced through CS-25 “Certification Specifications for Large Aeroplane” amendment 5 with a new Subpart H – Electrical Wiring Interconnection Systems – EWIS. The new amendment has been published as part of the ED Decision 2008/006/R on the 29th August 2008 and enters into force on September 5th, 2008.
For STC applications received after Jan. 1st 2009, the Agency is mandating the EZAP related aspects dealing with Instructions for Continued Airworthiness of these requirements through a generic Certification Review Item with a Special Condition based on Part 21A.16B(a)3 that will be therefore part of the Certification Basis for that STC.
Potentially affected applicants have been advised through a dedicated letter that was sent in October 2008, giving further details on affected aeroplanes, deliverables and compliance dates.