| Abbreviation | Definition |
|---|---|
| IE | Industrial Engineering |
| IEA | Integrated Electronic Assembly |
| IECM | Induced Environment Contamination Monitor |
| IECO | Inboard Engine Cut-Off |
| IECS | Igloo Environment Control Subsystem |
| IED | Interacting Equipment Document |
| IEEE | Institute of Electrical and Electronics Engineers |
| IEEE-APS | Institute of Electrical and Electronics Engineers - Antennas and Propagation Society |
| IEF | Iso-Electric Focusing |
| IEP | Instantaneous Effective Photo-cathode |
| IESW | Integrated Earth Sensing Workstation |
| IF | Inertial Fusion |
| IF | Integration Facility |
| IF | Intermediate Frequency |
| IFA | In-Flight Analyses |
| IFA | Interface Functional Analysis |
| IFASC | Integrated Functions Assessment Steering Committ |
| IFM | In-Flight Maintenance |
| IFO | Information Flight Office |
| IFOT | In-Flight Operations and Training |