OOOI Data refers to times of the actual aircraft movements of Gate Out, Wheels Off, Wheels On, and Gate In. This data are provided for several carriers on a next day basis from ARINC (a private aviation communications company), and additional carriers through TFMS (starting April 2015), and on a monthly basis from DOT's ASQP Data. In addition, since October 2012, CountOps Threshold Crossing Times, which are within seconds of the Wheels Off and Wheels On times, have been used to populate the Wheels Off and Wheels On times on a next day basis when no OOOI data are available. CountOps is an automated source of departure and arrival counts for Operations Network (OPSNET).
These actual aircraft movement times are the basis for many statistics throughout ASPM. When OOOI times are not available, they are estimated. For more information on estimation techniques, see ASPM: Estimation Techniques.
Most ARINC OOOI times are detected and transmitted automatically by sensors (such as doors, parking brakes, and strut switch sensors) in ACARS-equipped aircraft. OOOI from TFMS is provided by the air carriers through a data sharing agreement with the FAA. On and Off times from CountOps Threshold Crossing Times are based on radar hits on take-off or landing. The table below explains the action and condition related to each OOOI time from ACARS-equipped aircraft.
|Gate Out||Aircraft leaves gate or parking position.||Parking brake is released.|
|Wheels Off||Aircraft takes off.||Air/ground sensor on landing gear set to "airborne" state.|
|Wheels On||Aircraft touches down.||Air/ground sensor on landing gear set to "ground" state.|
|Gate In||Aircraft arrives at gate or parking position.||Parking brake is applied.|