The FAA today published a Notice of Issuance of Advisory Circular regarding its issuance of Change 1 to AC 23-21, Airworthiness Compliance Checklists Used to Substantiate Major Alterations for Small Airplanes. Change 1 was issued on April 8, 2005. It revises existing material in four paragraphs of AC 23-21 by (1) adding a reference to FAA Order 8300.10; (2) indicating that no further FAA approval is required when 100 percent of the data is DER approved; (3) including a reference to the FSDO/ASI for signature on FAA Form 337; and (4) including a requirement to submit ICA’s to the FSDO/ASI for acceptance.
The FAA notes that the most significant change is the revision requiring that the Aviation Safety Inspector in the Flight Standards District Office must now sign instead of an Airframe and Powerplant mechanic in order to return an aircraft to service after major alteration. The other changes are considered minor.