The FAA has published a new draft advisory circular that summarizes the currently available data regarding identification and treatment of corrosion on aircraft structures and engine materials. AC 43-4A is an extensive update of the previous version issued nearly three decades ago. The FAA emphasized that corrosion inspections and treatment continue to be the “responsibility of you, the operator, and you should accomplish these inspections per this AC, manufacturer’s recommendations, or your own maintenance program.”
The agency said the procedures in this AC are particularly applicable to aircraft for which the manufacturer has not published corrosion control information. However, where the aircraft manufacturer has published recommended corrosion inspection schedules and treatments, “that program should take precedence over the recommendations of this AC.”
Under the provisions outlined in the nearly 50-page circular, the FAA requires operators to follow a “constant cycle of cleaning, inspection, operational preservation, and lubrication to prevent corrosion. Prompt detection and removal of corrosion will limit the extent of damage to an aircraft and its components.”
Comments on the draft of AC 43-B are due June 21. A form on the last page of the document should be used to submit any deficiencies found, clarifications needed, or suggested improvements to this draft.
