History: Below is a listing of the Revisions and Changes made to this UFGS.
| KEY | PREPARING ACTIVITY (PA) | A Army | N Navy | F Air Force | S NASA [ARCHIVED] |
|---|---|---|---|---|---|
| ACTION | N New | R Revision | C Change | D Deletion |
| Release | PA | Date | Action | Change # | Nature of Change or Revision |
|---|---|---|---|---|---|
| May-2024 | N | Feb-2020 | C | 1 | In response to CCR 14821, removed references to UFGS 21 13 20.00 20 (archived 05/24) by deleting paragraph Fire Foam Extinguishing Systems (1.2.3) and related paragraph under Sequencing (1.4). |
| Feb-2020 | N | Feb-2020 | N | New specification covering the requirements for high-pressure, preconditioned air units, ductwork and controls for aircraft cooling systems in conjunction with UFC 4-211-01, Aircraft Maintenance Hangars. |
