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transportation safety boards, and ICAO, and members from Canada, the European Union,
France, Italy, Japan, the Netherlands, the United Kingdom, and the United States. CICTT is
co-chaired by a representative from ICAO and a representative from CAST.
To accomplish its objectives, CICTT has developed the following common taxonomies and
definitions: Phase of Flight; Occurrence Categories; Aircraft Make/Model/Series tables; Engine
Make/Model tables; and a detailed taxonomy for accident/incident data systems.
It is important to note that CICTT does not expect governments, international organizations, and
corporations to immediately change existing data systems or existing definitions. The intent is to
provide “target” taxonomies and definitions for adoption by organizations planning for, and
implementing new safety systems.
The Phase of Flight definitions below consist of broad operational phases, plus "Unknown."
Most of the phases have sub-phases. Organizations that use these definitions may use the broad
phases, the more detailed sub-phases, or a combination. This version focuses on powered
fixed-wing land and rotorcraft operations. Future updates will cover other aircraft.
For the purposes of this document, phase of flight refers to a period within a flight. A flight
begins when any person boards the aircraft with the intention of flight and continues until such
time as all such persons have disembarked. [ICAO Annex 13]
Contact point for all CICTT work:
CICTT@intlaviationstandards.org
Page Revised 2/2006 Page 2
STANDING (STD)
Prior to pushback or taxi, or after arrival, at the gate, ramp, or parking area, while the
aircraft is stationary.
This phase of flight includes the following sub-phases:
• Engine(s) Not Operating.
• Engine(s) Start-up.
• Engine(s) Operating.
• Engine(s) Shutdown.
Usage Notes:
• Engine shutdown is from the start of the shutdown sequence until the engine(s)
cease rotation.
PUSHBACK/TOWING (PBT)
Aircraft is moving in the gate, ramp, or parking area, assisted by a tow vehicle [tug].
This phase of flight includes the following sub-phases:
• Assisted, Engine(s) Not Operating.
• Assisted, Engine(s) Start-up.
• Assisted, Engine(s) Operating.
• Assisted, Engine(s) Shut Down.
Usage Notes:
• Unassisted movement in the gate or ramp area is included in the TAXI phase.
• Engine shutdown is from the start of the shutdown sequence until the engine(s)
cease rotation.
Page Revised 2/2006 Page 3
TAXI (TXI)
The aircraft is moving on the aerodrome surface under its own power prior to takeoff or
after landing.
This phase of flight includes the following sub-phases:
• Power Back: Takes place when the aircraft, under its own power, reverses from the stand or
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PHASE OF FLIGHT DEFINITIONS AND USAGE NOTES(2)
