BY ORDER OF THE COMMANDER
AIR FORCE MATERIEL COMMAND
AIR FORCE MATERIEL COMMAND
INSTRUCTION 21-104
20 NOVEMBER 2019
Maintenance
CONTROLLED INTERVAL EXTENSION
(CIE) PROGRAMS
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 restrictions on releasing this publication.
OPR: HQ AFMC/A4/10-EN
Supersedes: AFMCI 21-104, 31 Jan 02
Certified by: HQ AFMC/A4/10
(Luke H. Burke)
Pages: 5
This instruction implements AFPD 21-1, Maintenance of Military Materiel. It provides guidance
and procedures for establishing and monitoring CIE programs for aerospace equipment. This
instruction does not apply to the Air National Guard or US Air Force Reserve units and members.
This AFMCI may be supplemented at any level. 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 Forms 847 from the field through the
appropriate functional chain of command. 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, Table 1.1 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. 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 Air Force Records
Disposition Schedule (RDS) located in the Air Force Records Information Management System
(AFRIMS). The use of the name or mark of any specific manufacturer, commercial product,
commodity, or service in this publication does not imply endorsement by the Air Force.
