Aerospace Acronyms: O
| Acronym | Definition |
|---|---|
| OATS | Oxford Air Training School. |
| Obst | Obstruction. |
| OBS | Omni-Bearing Selector. |
| OCH | Obstacle Clearance Height. The lowest height above the elevation of the runway threshold or above aerodrome elevation. |
| OCA | Obstacle Clearance Altitude. |
| OCL | Obstacle Clearance Limit. |
| OEM | Original Equipment Manufacturer. |
| Okta | A measurement of cloud cover. One okta means one-eighth of the sky is covered. |
| Omega | High accuracy, very-low frequency (VLF) long-range navigation system used principally by airliners, military aircraft and intercontinental business aircraft. |
| O/R | On Request. |
| O/T | Other Times. |
