| O |
Operations |
OK |
Operating normally |
| O/A |
On or About |
OLDI |
On Line Data Interchange |
| O/R |
On Request |
OLF |
Outlying Field |
| O/T |
Other Time |
OLS |
Optical Landing System |
| OALT |
Operational Acceptance Level of Traffic |
OM |
Outer Marker |
| OAM |
Office of Aviation Medicine |
ON |
Octane Number |
| OAP |
Offset Aim Point |
ONC |
Operational Navigational Chart |
| OAT |
Outside Air Temperature |
ONER |
Oceanic Navigational Error Report |
| OBS |
Omnibearing Selector |
op |
operation |
| obst |
obstacle or obstruction |
oper |
operate or operating |
| obstn |
obstruction |
OPI |
Office of Primary Interest |
| OC |
Overcentering |
opn |
operation |
| OCA |
Obstacle Clearance Altitude |
opns |
operations |
| OCH |
Obstacle Clearance Height |
opp |
opposite |
| OCL |
Obstacle Clearance Limit |
opr |
operate |
| OCS |
Officer Candidate School |
ops |
operates or operations |
| Oct |
October |
opt |
option(al) |
| OD |
Outside Diameter |
orig |
original |
| ODALS |
Omnidirectional Approach Lighting Systems |
OSHA |
Occupational Safety and Health Administration |
| ODAPS |
Oceanic Display And Planning System |
OST |
Office of the Secretary of Transportation |
| ODS |
Operator-input and Display System |
OTC |
Over The Counter |
| OEI |
One Engine Inoperative |
OTR |
Oceanic Transition Route |
| ofc |
office |
OTS |
Organized Track System |
| OFT |
Outer Fix Time |
OTS |
Out of Service |
| OFZ |
Obstacle Free Zone |
outbd |
outboard |
| OGE |
Out of Ground Effect |
ovrn |
overrun |
| OGV |
Outlet Guide Vanes |
oxy |
oxygen |
