Many aviation occurrence reporting
systems capture the phase of
operation or the phase of flight in
which the event that is to be reported
occurred. The list of phases
provided here aims at providing
guidance for this classification.
PHASE OF FLIGHT
DEFINITIONS AND USAGE NOTES
October 2011 (1.1)
Page Revised 5/2011 Page ii
RECORD OF REVISIONS
Date Version Section Revision
10/2011 1.1 Takeoff Added final bullet regarding unmanned aircraft systems
5/2011 1.0.3 Document Reformatted Document
4/2011 1.0.3 Introduction Replaced the ICAO and CAST contacts with new CICTT
email address
4/2011 1.0.3 Takeoff Added Usage Notes for Helicopters-bullets 2 and 3
4/2011 1.0.3 Landing Added Aborted Landing After Touchdown as a
sub-phase
6/2010 1.0.2 Introduction Replaces the ICAO co-chair with André de Kock and
adds a “power back” sub-phase under the “taxi” phase
2/2006 1.0.1 Introduction Replaces the ICAO co-chair with Yuri Fattah
Page Revised 2/2006 Page iii
TABLE OF TERMS
STANDING (STD) _____________________________________________________________________ 2
PUSHBACK/TOWING (PBT) _____________________________________________________________ 2
TAXI (TXI) ___________________________________________________________________________ 3
TAKEOFF (TOF) _______________________________________________________________________ 4
INITIAL CLIMB (ICL) ___________________________________________________________________ 4
EN ROUTE (ENR) _____________________________________________________________________ 5
MANEUVERING (MNV) ________________________________________________________________ 5
APPROACH (APR) _____________________________________________________________________ 6
LANDING (LDG) ______________________________________________________________________ 7
EMERGENCY DESCENT (EMG) ___________________________________________________________ 7
UNCONTROLLED DESCENT (UND) ________________________________________________________ 7
POST‐IMPACT (PIM) __________________________________________________________________ 7
UNKNOWN (UNK) ____________________________________________________________________ 8
Page Revised 4/2011 Page 1
INTRODUCTION
The International Civil Aviation Organization (ICAO) and the Commercial Aviation Safety
Team (CAST), which includes Government officials and aviation industry leaders, have jointly
chartered the CAST/ICAO Common Taxonomy Team (CICTT). The team was charged with
developing common taxonomies and definitions for aviation accident and incident reporting
systems. The common taxonomies and definitions are intended to improve the aviation
community’s capacity to focus on common safety issues. CICTT includes experts from air
carriers, aircraft manufacturers, engine manufacturers, pilot associations, regulatory authorities,
　
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