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