AIR FORCE INSTRUCTION 21-103
AIR COMBAT COMMAND Supplement
ADDENDUM_Z
23 JULY 2013
CERTIFIED CURRENT, 22 OCTOBER 2020
Maintenance
EQUIPMENT INVENTORY, STATUS, AND
UTILIZATION REPORTING SYSTEM T-
38A/AT-38B MINIMUM ESSENTIAL
SUBSYSTEM LIST (MESL)
OPR: HQ ACC AMIC/PMAM
Supersedes: AFI 21-
103_ACCSUP_ADD_Z, 9
April 2003
Certified by: HQ ACC AMIC/DR
(Mr. Randall McFadden)
Pages: 5
This MESL compliments AFI 21-103, Equipment Inventory, Status, and Utilization Reporting.
It applies to all T-38A/AT-38B ACC units. This Addendum does not apply to Air National
Guard (ANG) and Air Force Reserve Command (AFRC) units and members. Ensure that all
records created as a result of processes prescribed in this document are maintained in accordance
with (IAW) AFMAN 33-363, Management of Records, and are disposed of IAW the Air Force
Records Information Management System (AFRIMS) Records Disposition Schedule (RDS).
Contact supporting records managers as required. Send recommended changes or comments on
AF Form 847, Recommendation for Change of Publication, to HQ ACC AMIC/PMAM, 130
Douglas St., Suite 210, Langley AFB VA 23665- 2791, and send information copies to the
applicable OCR. OCR: HQ ACC/A4Q (Col Neal Robinson)
1. General. The MESL is the basis of status reporting IAW AFI 21-103. MESLs lay the ground
work for reporting the status of aircraft capability. They list the minimum essential systems and
subsystems that must work on an aircraft for it to perform specifically assigned unit wartime,
training, test or other missions. Mission Ready Available (MRA) is used in readiness Status of
