Download - 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
CIVIL AVIATION SAFETY AUTHORITY
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
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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
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EDTO Rules
• EDTO operations rules provided under• ICAO annex 6• CAO 82.0
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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.
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Threshold Time
• More than 19 passengers or max payload capacity exceeds 3410kg:• twin engine – 90 minutes; or• more than 2 engines – 180 mins
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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
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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
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Adequate Aerodrome
• CAO 82.0• Physical requirements • Provides facilities and services for
type • meteorological forecasts• authorised instrument approach
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EDTO Alternate Aerodrome
• adequate aerodrome listed in AOC holder’s EDTO safety operational specifications
• inside Australian territory • outside Australian territory
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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
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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
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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
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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
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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