Project OS 11/46 - Proposed amendments to CAO 82.0 - Extended Diversion Time Operations (EDTO)
Project closed 16 February 2015.
Civil Aviation Order 82.0 Amendment Instrument 2014 (No.2) has been made and commenced on the 1st January.
The Amendment Instrument can be downloaded from ComLaw : CAO 82.0 (No. 2.
The applicable CAAP 82-1(1) - Extended Diversion Time Operations (EDTO) has been revised and published onto the CASA website.
Amendments to CAO 82.0 subsection 3BC were made by CASA on the 13th July 2007. One effect of these amendments was to change the then-existing threshold time relating to extended range operations (for which CASA approval is required) from 60 minutes to 90 minutes. This change was made in the expectation that ICAO, the NZCAA (with whom CASA had jointly developed the associated standards for EDTO) and subsequently the world's major regulatory authorities, would also be moving in this direction. However, it was realised that neither NZ nor the major regulatory authorities will be altering their 60 minute threshold times for twin engined aeroplanes to 90 minutes and CASA accordingly re-evaluating its policy.
In March 2010, the Director of Aviation Safety wrote to all operators of twin turbine engined aeroplanes certified to carry more than 19 passengers or having a payload capacity exceeding 3410kg regarding proposed changes to CAO 82.0 Subsection 3BC - Route Distance Limitations.
The letter advised that CASA is proposing to amend CAO 82.0 so as to return the threshold time for affected twin turbine engined aeroplanes to 60 minutes. This would be achieved by changing "90 minutes" in subparagraph (a) (i) of the definition of "threshold time" to "60 minutes" by deleting paragraphs 3BC.5, 3BC.6 and 3BC.8, and by changing the references in 3BC.7 from 90 minutes to 60 minutes.
The effects of these changes would be:
- Operations to 75 minutes from an adequate aerodrome without an aeroplane having to meet the appropriate type design and without CASA approval being required would no longer be permitted (note that CASA would not intend to grandfather any such operations currently being conducted); Note: The current CAO 82 does not provide provision for aeroplanes that do not meet appropriate type design standards beyond 2015. At the time of drafting and making the CAO in 2007, CASA in joint industry consultation agreed that an eight (8) year transition period was ample time for operators to comply. As such an operator affected by the withdrawal of this CAO provision will be granted an exemption till 2015. However, operators will then need to comply.
- Twin turbine engined aeroplanes certificated to carry more than 19 passengers or having a maximum payload capacity exceeding 3410kg would be limited to a distance equivalent to 60 minutes at the one-engine inoperative cruise speed from an adequate aerodrome (assuming still air and ISA conditions) unless operating under an EDTO approval. Operators will be provided with a 6 month transition period from the date the CAO is made.
- The requirements of CAO 82.0 Appendices (4) and (5) would apply to aeroplanes with two turbine engines operating beyond 60 minutes threshold time, from an adequate aerodrome
- The requirements of applicable sections of CAO 82.0 Appendices (4) and (5) for aeroplanes with more than two turbine engines aeroplanes with a maximum diversion time beyond 180 minutes threshold time, from an adequate aerodrome
CASA is also seeking to harmonise EDTO standards for three (3) and four (4) engined aeroplanes with ICAO Annex 6 and international best practice. This project has provided clarification that specific maintenance or type design requirements are not required for aeroplanes with more than two engines engaged in EDTO.
Consistent with the terms of reference of this project, and consideration of the harmonization with ICAO Annex 6 and international best practice, aeroplanes with more than two turbine engines will have a maximum threshold time of 180 minutes. Operations to a maximum diversion time exceeding 180 minutes threshold time will be conducted in accordance with EDTO operations. The maximum diversion time determined by the most time-limited EDTO significant system, if any, identified in the AFM or OEM operations manual. This maximum diversion time will be reduced by an operational safety margin of not less than 15 minutes. For aeroplanes with more than two turbine engine, the cargo fire suppression system will be consider to be the time-limited EDTO significant system if there is no specified EDTO time-limited system. These EDTO operational standards will apply on or after 1 July 2015, the previous reference to the date of manufacture is no longer valid and has been removed.
The objectives of the project are to:
- Harmonise CAO 82 with ICAO's Annex 6 Part I EDTO and international best practice. Consequently, CASR Part 121 will reflect the new changes;
- Provide appropriate provisions that facilitate the use of advanced aeroplane design whilst ensuring aviation safety is maintained.
- Updates to the Air Operator Certification Manual (AOCM) if applicable.
This project was approved by Peter Boyd, Executive Manager Standards Development & Future Technology Division on 25 November 2011.
Project Leader: Miles Gore-Brown
Project Sponsor: Peter Boyd Executive Manager, Standards Division and Gerard Campbell Executive Manager, operations Division.