| 1 | outside air temperature | OAT |
|---|
| 2 | overcome by events | OBE |
|---|
| 3 | omni-bearing selector | OBS |
|---|
| 4 | obstacle clearance altitude | OCA |
|---|
| 5 | on condition / condition monitored components | OCCM |
|---|
| 6 | obstacle clearance height | OCH |
|---|
| 7 | one engine inoperative | OEI |
|---|
| 8 | original equipment manufacturer | OEM |
|---|
| 9 | outlet guide vane | OGV |
|---|
| 10 | overhaul manual | OHM |
|---|
| 11 | obstacle identification surface | OIS |
|---|
| 12 | outer marker | OM |
|---|
| 13 | outer mold line | OML |
|---|
| 14 | onboard network system | ONS |
|---|
| 15 | Onboard Network Access Terminal | ONAT |
|---|
| 16 | out of service | OTS |
|---|
| 17 | operational check | OPC |
|---|
| 18 | operational check | OPS/CHK |
|---|
| 19 | operational weight | OW |
|---|
