System Safety in EDTO Extended Range Operations is based, as it was in the case of the original ETOPS concept, on two fundamental principles: The inclusion of appropriate content in relevant personnel training programmes.ĮDTO flights are subject to a process of explicit approval which, as with the former Extended Range Twin Operations system, has both aeroplane type design and aeroplane operational requirements.The assurance to the extent possible for twin-engined aeroplanes only that an aerodrome will be available if its use as an alternate becomes necessary.The provision of comprehensive and current information on aerodromes to be used as alternates.The identification of alternate aerodromes.Operational control and dispatch procedures.Non-EDTO flights are expected, without any detailed specification, to be subject to flight planning principles which are additional to those for 'normal' operations in respect of: However, note that the FAA uses the one engine out speed as the basis for all aeroplane type EDTO approvals. ICAO uses the flying time at the one engine out speed in ISA and Still Air to convert Threshold Time to distance for aeroplanes with two engines but the all engines operating speed in ISA and Still Air for the same conversion for aeroplanes with more than two engines. The main change is that a distinction is drawn between such operations which do not exceed an established 'Threshold Time' defined as "the range, expressed in time, established by the State of the Operator to an en-route alternate aerodrome, whereby any time beyond it requires an EDTO approval from that State". The new ICAO guidanceĪnnex 6, and particularly Attachment D to that Annex, now contains guidance on extended range operations for all turbine-engined aeroplanes which are conducted beyond 60 minutes from a point where it is possible to fly to an en-route alternate aerodrome. EASA currently continues to use ETOPS as originally defined and the abbreviation 'LROPS' (Long Range OPerationS) for extended range operation by three and four-engined aircraft. Given this flexibility, the term 'ETOPS' has been retained by the FAA and others by redefining it as an abbreviation for 'ExTended range OPerationS' rather than as previously 'Extended range Twin OPerationS'. However since then, although the EDTO regime has been widely accepted, the term EDTO has not been universally adopted the continued use of ETOPS is explicitly allowed for in Annex 6 provided that EDTO concepts "are correctly embodied in the concerned regulation or documentation". This introduced the Extended Diversion Time Operations (EDTO) regime in place of ETOPS. As aeroplane reliability and range improved, it became clear that all multi turbine-engined aircraft were pushing the boundaries of flight away from nearby alternates to increasingly distant ones and a review of the existing arrangements for ETOPS began.Īfter many years of discussion about how to broaden the facilitation of international flights for all large transport aeroplanes which necessitated tracks with no close-by diversion aerodromes (or could be more efficiently routed with the use of these tracks), led in 2012 to changes to ICAO Annex 6 Part 1 under Amendment 36. ICAO Requirements for Extended Range Twin-engine Operations (ETOPS) have been in place since 1985, when they were introduced to apply an overall level of operational safety for twin-engined aeroplanes which was consistent with that of the modern three and four-engined aeroplanes then flying, to which no restrictions were applied. EXTENDED DIVERSION TIME OPERATIONS (EDTO) The Regulatory Context
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