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VirginFlyer
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Which NAAs No Longer Restrict Twin-engine EDTOs?

Tue Jun 16, 2009 9:28 am

In a recent thread - QF To Defer 787s (by NA Jun 9 2009 in Civil Aviation) - I wrote about Australia's current requirements for Extended Diversion Time Operations, which have replaced ETOPS requirements here.

Quoting VirginFlyer (Reply 47):
[EDTO is detailed in] CAO 82.0 [which] can be downloaded at http://www.casa.gov.au/wcmswr/_asset...ain/download/orders/cao82/8200.pdf. Sections 3B, 3BA, 3BB, 3BC and 3BD, and appendices 3, 4, 5 and 6 are the relvant sections.

In summary: operations by a twin turbine-engined aeroplane up to 180 minutes from an EDTO (extended diversion time operation) alternate aerodrome at 1 engine inoperative cruise speed in ISA and still air conditions may be permitted if certain conditions are met.

For operations beyond 180 minutes from an EDTO alternate aerodrome at 1 engine inoperative cruise speed in ISA and still air conditions for any aeroplane, the operator must meet the conditions for issue of an EDTO approval, and the aircraft must have serviceable for dispatch:

• an FQIS (fuel quantity indicating system)
• if it is required for EDTO - the APU (including electrical and pneumatic supply to its designated capability)
• a communication system, in addition to any mentioned in the AIP [Aeronautical Information Publication], capable of providing direct communication of landline voice quality between the flight crew and air traffic services, and the flight crew and the operator.

Additionally, for twin turbine-engined aircraft, the specific airframe/engine combination must already be authorised for operations up to 180 minutes from an EDTO (extended diversion time operation) alternate aerodrome at 1 engine inoperative cruise speed in ISA and still air conditions, and the auto throttle system must be serviceable for dispatch.

For operations beyond 240 minutes from an EDTO alternate aerodrome at 1 engine inoperative cruise speed in ISA and still air conditions for twin turbine-engined aeroplanes, approval may only be granted if the specific airframe/engine combination has been operating for a minimum of 24 months under an EDTO approval.

I know the FAA have made a similar move - US FAA To End Etops Restrictions (by DEVILFISH Jan 10 2007 in Tech Ops) - though I'm not familiar with the details (if someone who is familiar with them wants to summarise the FAA regs on this, that would be great!). In New Zealand, based on Advisory Circular AC121-1 as hosted on the CAA's website - http://www.caa.govt.nz/Advisory_Circulars/AC121-1.pdf - it would appear that the 180 minute diversion time limitation still exists for twin engine aircraft (although given the AC is 9 years old and noted as being interim, there may be further development that I'm not aware of).

I'm wondering which other National Aviation Authorities have similarly removed restrictions on EDTOs of twin engine aircraft in favour of general requirements for all EDTOs regardless of engine number, and whether there is an ICAO standard on this yet, or if it is still something that is evolving at NAA level?

V/F
"It is not for him to pride himself who loveth his own country, but rather for him who loveth the whole world. The earth is but one country, and mankind its citizens." - Bahá'u'lláh

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