BY ORDER OF THE
SECRETARY OF THE AIR FORCE
AIR FORCE INSTRUCTION 21-101
16 JANUARY 2020
UNITED STATES AIR FORCES
EUROPE–AIR FORCES AFRICA
Supplement
25 AUGUST 2020
Incorporating Change 1
1 NOVEMBER 2021
Maintenance
AIRCRAFT AND EQUIPMENT
MAINTENANCE MANAGEMENT
COMPLIANCE WITH THIS PUBLICATION IS MANDATORY
ACCESSIBILITY: Publications and forms are available for downloading or ordering on the
e-Publishing 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: 424
(USAFEAFAFRICA)
OPR: HQ USAFE-AFAFRICA/A4M
Certified by: USAFE-AFAFRICA/A4M
(Col Brian R. Stuart)
Pages: 4
This publication implements Air Force Policy Directive (AFPD) 21-1, Maintenance of Military
Materiel. It is the basic Air Force Instruction (AFI) 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 Regular Air Force (RegAF),
Air Force Reserve (AFR) and Air National Guard (ANG) and those with contractual obligation to
