Join ARSA Ask ARSA Pay ARSA

FAA Officially Withdraws Memo Incorrectly Defining ‘Engine Influencing Parts’

On Dec. 19, ARSA received a letter from Susan Cabler, acting manager of the FAA’s Design, Manufacturing & Airworthiness Division (AIR-100), announcing the withdrawal of FAA Policy Memorandum AIR100-16-160-PM09.

The announcement came in response to an Oct. 14 request jointly submitted by ARSA and Airlines for America (A4A) to the agency. That original letter noted the memo erroneously relied on Advisory Circular 33.70-1 to define “engine influencing parts.” Cabler’s response was light on details, but noted the FAA will continue to coordinate future policy regarding additive manufacturing – the subject of the memo in question –  meaning that maintenance providers must remain attentive to continued attempts to constrain parts production.

To read the response letter, click here.

For information on ARSA and A4A’s initial request, review the content below.

For information on a legislative effort joined by a number of aviation associations to prevent Congressional incursion into parts markets, click here.

Previously from ARSA...

11/1/16 - (UPDATED) ARSA, A4A Remind FAA It's Never Defined 'Engine Influencing Parts'

November 1, 2016

UPDATE: The FAA has withdrawn Policy Memorandum AIR100-16-160-PM09. Although no reason has yet been specified by the agency, the association is hopeful it was because of the joint request filed by ARSA and A4A on Oct. 14 (see below).


Oct. 17, 2016

On Oct. 14, ARSA and Airlines for America (A4A) jointly requested the withdrawal of FAA Policy Memorandum AIR100-16-160-PM09 because it erroneously relied on Advisory Circular 33.70-1 to define “engine influencing parts.”

Despite the memo’s contention to the contrary, the term does not appear any of the agency’s guidance nor 14 CFR part 33. The associations’ request further noted that the FAA’s issuance of the policy memorandum conflicted with the agency’s document release procedures and should likewise be withdrawn. Both organizations emphasized the agency should not impose any additional requirements for influencing parts without specific regulatory authority or public comment.

To read the full ARSA/A4A submission, click here.

To see all the ways ARSA works on behalf of the aviation maintenance community, visit the ARSA Works page.



More from ARSA

Quick Question – 2026 Conference Planning

March 17-20, 2026 Arlington, Virginia and Washington, D.C. with Livestream Options for Online Participants Event Information | Registration Coming December 2025 The repair station community’s premier substantive event returns; help ARSA’s…Read More

ARSA/AEA Complete First SMS Integration Webinar

On Oct. 29, ARSA and the Aircraft Electronics Association presented the first of six planned webinars – a monthly series stretching into March 2026 – explaining effective integration of a…Read More

Investing in New Careers Through Choose Aerospace

For years, the ARSA Annual Scholarship has been awarded through Choose Aerospace to a deserving aerospace maintenance student. Along with other aviation industry allies, the association has long been part…Read More

FAA Limits Communications During Shutdown

On Oct. 1, the U.S. government shut down as a result of Congress’ inability to pass legislation funding executive branch operations past they end of the fiscal year. According to…Read More

Reminder: FAA/EASA MAG 10 Compliance

Reminder: The “first” Safety Management System compliance deadline for EASA approval under the U.S./EU bilateral arrived October 10 when MAG Change 10 became effective. As of that date, new applicants must…Read More
ARSA