| Acronym | Meaning |
![](file.png) | OMMH | Orbiter Maintenance Man-Hours |
![](file.png) | HMD | Helmet-Mounted Display |
![](file.png) | HGVT | Horizontal Ground Vibration Test |
![](file.png) | IPS | IRR InsPection Rejection Report |
![](file.png) | S/AC | Stabilization/Attitude Control |
![](file.png) | PPL | Planning Parts List |
![](file.png) | TO | Operations Management (TS) |
![](file.png) | PROP | Proportioning |
![](file.png) | SR | Standard Repair |
![](file.png) | TW | Traveling Wave |