1. PURPOSE OF THIS ADVISORY CIRCULAR (AC). This AC provides guidance for the
development, qualification, and approval of bias and radial aircraft tire retreads, their repair and
process specifications, and the use of special nondestructive inspection (NDI) techniques.
This material is neither mandatory nor regulatory in nature and does not constitute a regulation.
It describes acceptable means, but not the only means, for developing specifications to be
submitted to the proper Federal Aviation Administration (FAA) office for approval. The FAA
will consider other methods of demonstrating compliance that an applicant may elect to present.
Terms such as “shall” and “must” are used only in the sense of ensuring applicability of this
particular method of compliance when the methods of compliance described in this document
are used.

2. PRINCIPAL CHANGES. This change updates references in paragraph 5; adds standard
information in paragraphs 2, 3, and 19; and updates paragraph numbers throughout the AC.

Purpose of This Order. This order grants certain authority to the Aircraft Certification Service (AIR) to manage technical policy and airworthiness projects for aircraft certification, including type, original airworthiness, and production certification programs.

This deviation extends the date when a requesting managing office must submit a hand-off memorandum to the assigned office. A hand-off memorandum is applicable to a principal inspector audit, supplier control audit, and a product audit.
FAA Order 8120.23A, Certificate Management of Production Approval Holders, paragraph 3-16a, requires a requesting managing office to submit, in the Aircraft Certification Audit Information System (ACAIS), a hand-off memorandum to the assigned office no later than May 1 of each year. For fiscal year 2017 only, a requesting managing office must submit, in ACAIS, a hand-off memorandum to the assigned office no later than July 7, 2017.
This deviation will expire on October 1, 2017.

The use of IBFs on rotorcraft is becoming a common occurrence. This policy statement provides guidance to ensure compliant and safe IBF installations and identifies items that should be considered when installing an IBF in a rotorcraft, such as the determination of power available and the evaluation of the alternate air source system.