Dafi21-101

BY ORDER OF THE

SECRETARY OF THE AIR FORCE

DEPARTMENT OF THE AIR FORCE

INSTRUCTION 21-101

16 JANUARY 2020

Incorporating Change 1,

20 DECEMBER 2023

Maintenance

AIRCRAFT AND EQUIPMENT

MAINTENANCE MANAGEMENT

COMPLIANCE WITH THIS PUBLICATION IS MANDATORY

ACCESSIBILITY: Publications and forms are available for downloading or ordering on the ePublishing website at www.e-publishing.af.mil. RELEASABILITY: There are no releasability restrictions on this publication.

OPR: AF/A4LM

Supersedes:

AFI 21-101, 1 May 2015
AFI 21-110, 16 Jun 2016
AFI 21-123, 3 Feb 2017
AFI 21-124, 12 Jan 2017
and AFI 21-136, 3 Feb 2017

Certified by: SAF/AQD
(Ms. Angela L. Tymofichuk)
Pages: 306

This publication implements Air Force Policy Directive (AFPD) 21-1, Maintenance of Military Materiel. It is the basic Department of Air Force Instruction (DAFI) for all weapon system and support equipment maintenance management guidance. It provides the minimum essential guidance and procedures to safely and effectively maintain, service, and repair weapon systems and support equipment. This publication applies to all military and civilian members of the United States Air Force (USAF), United States Space Force (USSF), Air Force Reserve (AFR), and Air National Guard (ANG) as well as those with contractual obligation to comply with Air Force publications. Supplements and addendums are written in accordance with (IAW) Department of the Air Force Manual (DAFMAN) 90-161, Publishing Processes and Procedures. Supplements must identify and document major command (MAJCOM), AFR, and ANG required deviations (applicability, variance, exception, and differences in organizational placement of responsibilities/processes) in their supplement and addendums with the abbreviation (DEV). Place the “DEV” entry after the paragraph number and directly preceding the affected text, such as “(AMC) (DEV) Use the...” or “(ADDED-AMC) (DEV) Use the...).” MAJCOMs supplements are submitted
to
the
Air
Force
Maintenance
Division

(AF/A4LM)

@
[email protected] for approval. Supplements and addendums are to be

DAFI21-101 16 JANUARY 2020

published in the e-Publishing website. The authorities to waive wing and unit level requirements in this publication are identified with a Tier (“T-0, T-1, T-2, or T-3”) number following the compliance statement. See DAFMAN 90-161 for a description of the authorities associated with the Tier numbers. Submit requests for waivers through the chain of command to the appropriate