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UPDATE: The FAA has withdrawn Policy Memorandum AIR100-16-160-PM09.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FAA’s issuance of the policy memorandum conflicted with the agency’s document release procedures and should likewise be withdrawn.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

The Competition Was Fierce

On April 23, the 2026 Aerospace Maintenance Council Competition hosted on the exhibit floor of Aviation Week’s MRO Americas wrapped. Five-member teams from schools, industry, and the military competed in…Read More

Help DOT Assess FAA Consistency

ARSA calls on its repair station members to assist the Department of Transportation’s Office of Inspector General’s (OIG) audit of the FAA. Congress’ May 2024 reauthorization of the agency required the…Read More

Industry Guides FAA Towards Mutual International Acceptance

On April 13, ARSA and a group of aerospace trade associations provided the FAA with feedback on a rulemaking plan to establish international flexibility in the U.S. aviation safety rules.…Read More

Levanto Voices Conference Highlights

On March 30, AviationWeek’s MRO Podcast published its recap discussion of ARSA’s 2026 Annual Conference. Vice President of Operations Brett Levanto joined Editors Lee Ann Shay and Sean Broderick to…Read More

Protect Your Inbox (and ARSA’s Reputation)

On April 7, ARSA learned of a SPAM email sent using a team member’s credentials with the subject “Kimberly Dimmick shared Aeronautical_Repair_Station_Invoice” with you”. This message is not legitimate. What to…Read More
ARSA