civil aviation safety authority extended diversion time operations presented by mark sinclair, casa

CIVIL AVIATION SAFETY AUTHORITY

Extended Diversion Time OperationsPresented by Mark Sinclair, CASA


Extended Diversion Time Operations

• Applies to all turbine-engine aircraft• Flight time - 1 engine inoperative cruise

speed - from point on route to adequate aerodrome is > threshold time.

• Prior ETOPS • CAO 82.0 amended - new EDTO rules


EDTO vs ETOPS• EDTO

• Affects all aircraft • Alternates Aerodromes • Threshold 90 mins• Range circles 410nm - 60mins, 800nm-

120mins. • Same weather holding requirements• Window of suitability buffer not

applicable


EDTO Rules

• EDTO operations rules provided under• ICAO annex 6• CAO 82.0


Aeroplane Eligibility for EDTO

• EDTO approval eligible - must have EDTO type design approval in:

• Flight Manual or supp or

• Type Cert. Data Sheet or Supp Type Cert.


Threshold Time

• More than 19 passengers or max payload capacity exceeds 3410kg:• twin engine – 90 minutes; or• more than 2 engines – 180 mins


Route Distance Limitations

• Piston-engined aeroplanes• MTOW exceeds 5700 Kg • Engaged in charter or regular public

transport

• Limited route • no point > 60 mins • 1 eng inoperative cruise speed • from adequate aerodrome


Piston > 5700 Kg 60 min

Turbine < 19 passengers and > 5700 KgEDTO

180 min

Twin Turbine > 19 pax or > 3410 Kg payload

<75 min

EDTO (120, 180, 240)<90 min

60 min

Three, Four Turbine Engine (Passenger Operations Only)

EDTO180 min


Adequate Aerodrome

• CAO 82.0• Physical requirements • Provides facilities and services for

type • meteorological forecasts• authorised instrument approach


EDTO Alternate Aerodrome

• adequate aerodrome listed in AOC holder’s EDTO safety operational specifications

• inside Australian territory • outside Australian territory


ETP Critical Fuel Scenario

• CAO 82.0 s6.1 • EDTO flight cannot depart unless

fuelled to cover most limiting scenario•Depressurisation 2 engines•Depressurisation 1 engine•Failure 1 engine


Calculate ETP Critical Fuel Scenario

• ID most limiting scenario then include:• Fuel burn-off • 15 minutes hold at 1500ft• Fuel for and instrument approach and

landing• 5% wind speed factor • 5% PDA • Add fuel required by M.E.L / enroute icing


Earliest & Latest Times of Arrival

• Earliest ETA • add to ETD, interval dep point to ETP,

estimate elapsed time from critical point to EDTO Alternate Aerodrome.

• Latest ETA • add to ETD, interval dep point to ETP,

estimate elapsed time from that point back to EDTO Alternate Aerodrome.

• No 30 min buffers as with ETOPs


Window of Suitability

• time between earliest possible ETA and latest possible ETA, for specific EDTO Alternate Aerodromes.

• forecast weather conditions, must meet EDTO Dispatch Minima requirements for entire period.

• No 30min buffer in calculation


EDTO Dispatch Minimas• CAO82.0 Appendix 5 .Table 1 • New EDTO dispatch minima adds a

buffer based on:• accuracy of approach aid • ability to control aircraft • reliability of approach aid • and crew workload

• Note: only ILS precision approach

civil aviation safety authority extended diversion time operations presented by mark sinclair, casa

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