BY ORDER OF THE COMMANDER
AIR FORCE MATERIEL COMMAND
AIR FORCE MATERIEL COMMAND
INSTRUCTION 21-112
11 DECEMBER 2018
Maintenance
REPAIR OF AIRCRAFT ENGINE
CRITICAL PARTS
COMPLIANCE WITH THIS PUBLICATION IS MANDATORY
ACCESSIBILITY: This publication is available digitally on the AFDPO WWW site at:
http://www.e-publishing.af.mil
RELEASABILITY: There are no releasability restrictions on this publication.
OPR: AFLCMC/LPE
Supersedes: AFMCI 21-112,
02 May 2005
Certified by: HQ AFMC/A4/10/A4F
(Gary B. Bain)
Pages: 53
This Instruction implements AFPD 21-1, Managing Aerospace Equipment Maintenance. It gives
policy and instruction for the repair of aircraft engine critical parts. These policies/instructions
shall form the framework for a secure and reliable operation of aircraft engines, develop an
AFMC critical parts repair program, develop repair techniques and establish repair sources. It is
applicable to any organization which is managing Critical Application Items (CAIs) and Critical
Safety Items (CSIs). This instruction does not apply to the Air National Guard or US Air Force
Reserve units and members. This publication may not be supplemented at any level. Ensure that
all records created as a result of processes prescribed in this publication are maintained in
accordance with (IAW) Air Force Manual (AFMAN) 33-363, Management of Records, and
disposed of IAW the Air Force Records Information Management System (AFRIMS) Records
Disposition Schedule (RDS). Refer recommended changes and questions about this publication
to the Office of Primary Responsibility (OPR) using the AF Form 847, Recommendation for
Change of Publication; route AF Form 847 from the field through the appropriate functional
chain of command. Submit requests for waivers through the chain of command to this
Publication OPR for non-tiered compliance items. See Attachment 1 for a glossary of references
and supporting information. The authorities to waive wing/unit level requirements in this
publication are identified with a Tier (“T-0, T-1, T-2, T-3”) number following the compliance
statement. See AFI 33-360, Publications and Forms Management, for a description of the
authorities associated with the Tier numbers. Submit requests for waivers through the chain of
command to the appropriate Tier waiver approval authority, or alternately, to the Publication
OPR for non-tiered compliance items.
