- Runway Width Review of Part 139 MOS- Aerodromes Section 6.2 - Runways AND Post Implementation Review of Part 139 MOS - Aerodromes Chapters 1 & 2 including changes to subsequent chapters
Project AS 11/15 commenced on 24 May 2011 to amend the runway width requirements prescribed within Chapter 6 of Part 139 MOS. Part 139 MOS references the Convention on International Civil Aviation (the Chicago Convention) aerodrome reference code (ARC), which is the code to which aerodrome facilities and runways are designed. The application of the ARC in the Part 139 MOS has resulted in aircraft operations being limited based on aircraft characteristics. Runways that are narrower than the runway width dimensions set out in the ARC are classified as narrow runways.
At the time this project was initiated, CASA policy required aerodrome operators to widen runways to accommodate aeroplanes that were, at that time, operating into and out of aerodromes with narrow runways. In addition, many of the affected aeroplanes had approved narrow runway Aeroplane Flight Manual (AFM) supplements. Subsequent to the introduction of the Part 139 MOS, operations of aeroplanes into and out of aerodromes required specific exemptions against the runway width requirements.
As part of the original policy, CASA decided to move away from the established practice of permitting large aircraft to operate to lesser runways via operational exemptions and to require aerodromes to upgrade to the requirements of the new critical aircraft within a specified timeframe to meet the requirements of that size aircraft. Following further consideration of aeroplane operational requirements, CASA will no longer mandate that aerodrome operators must upgrade any facility for continued operations of a specifically approved aeroplane type, or the introduction of a new larger aircraft type. CASA intends that aerodrome upgrades will be based on a business decision made by the aerodrome operator; however aircraft operators will need to assess the available aerodrome facilities and any risks associated with operating larger aircraft into or from an aerodrome designed to a specific ARC, or in many cases aerodromes that were constructed prior to the current standards.
This change in policy requires a significant change to the Part 139 MOS with the removal of the references to ‘critical aircraft’ and ‘critical aeroplane’ from the MOS. This has the effect of de-linking continued aeroplane operations from aerodrome design requirements.
Aircraft operators will no longer need to apply for exemptions to operate aeroplanes into narrower runways than specified by the ARC. Aeroplanes will be required to operate in accordance with an approved AFM narrow runway supplement or specified AFM runway width limitation i.e. the Airbus A380 has an AFM 45 m wide runway limitation.
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