EASA SIB HQ-18-09R1: Aircraft Structures — Alodine Coating

What to do

Aviation professionals should review and consider adopting the Bonderite AMOC when performing repairs or modifications that require Alodine application under FAA ADs or AMOCs. They must retain one copy of the global AMOC in each aircraft's maintenance records as proof of compliance. No specific compliance deadlines are stated, but timely evaluation and record updating are recommended to maintain regulatory adherence.

Summary

The FAA Special Airworthiness Information Bulletin SAIB: HQ-18-09 R1 titled "Aircraft Structures — Alodine Coating" provides information about an approved alternative method of compliance (AMOC) for FAA airworthiness directives and previously approved AMOCs that require the use of Alodine coating on FAA type certificated aircraft, engines, and propellers. This bulletin applies broadly to all such aircraft and related components where Alodine is mandated. The AMOC permits the use of Henkel's renamed Bonderite products as a direct substitute for the former Alodine products without changing the product's protective properties.

What changed

This bulletin introduces an AMOC allowing the use of Henkel Bonderite products in place of Alodine for compliance with FAA ADs and previously approved AMOCs. It clarifies that the product name change does not affect the coating's characteristics and updates record-keeping requirements for this global AMOC. The bulletin also confirms that the airworthiness concern does not currently warrant issuing a new AD under 14 CFR part 39.

Why it matters

This matters because operators and maintenance organizations may face difficulties complying with ADs or AMOCs that specify Alodine due to the product's name change and unavailability under that name. The AMOC ensures continued compliance without compromising safety or requiring new ADs. It simplifies record keeping by allowing a single AMOC copy per aircraft, reducing administrative burden for compliance teams and MROs.