AFMCI21-104 governs procedures for establishing and monitoring Controlled Interval Extension programs for aerospace equipment.
View AFMCI21-104 on armypubs.army.mil
It covers CIE program responsibilities, PDM interval evaluation, aircraft selection, plateaus, sample sizes, and inspection requirements. It requires monitoring safety, reliability, readiness, and cost effectiveness when extending or reducing intervals.
Applies to: This publication applies to all AFMC Regular Air Force.
CIE programs set up controlled conditions for extending or reducing maintenance and inspection intervals without sacrificing safety of flight or reliability. (paragraph 1)
Programmed depot maintenance (PDM) intervals are best determined by evaluating aircraft safety and reliability requirements, compared to weapon system and cost effectiveness. (paragraph 3)
The time between plateaus is usually 6 to 12 months. (paragraph 1)
Note: CIE programs are not required for MDS forces of 36 or less. (paragraph 1)
The MAJCOM is the authority for changes to the CIE sample sizes. (paragraph 1)