1. Extended Diversion Time Operations
Presented by Mark Sinclair, CASA

2. 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

3. EDTO vs ETOPS EDTO Same weather holding requirements
Affects all aircraft
Alternates Aerodromes
Threshold 90 mins
Range circles 410nm - 60mins, 800nm-120mins.
Same weather holding requirements
Window of suitability buffer not applicable

4. EDTO Rules
EDTO operations rules provided under
ICAO annex 6
CAO 82.0

5. 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.

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

7. 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

8. Piston > 5700 Kg
60 min
Turbine < 19 passengers and > 5700 Kg
EDTO
180 min
Twin Turbine > 19 pax or > 3410 Kg payload
<75 min
EDTO (120, 180, 240)
<90 min
Three, Four Turbine Engine (Passenger Operations Only)

9. Adequate Aerodrome CAO 82.0 Physical requirements
Provides facilities and services for type
meteorological forecasts
authorised instrument approach

10. EDTO Alternate Aerodrome
adequate aerodrome listed in AOC holder’s EDTO safety operational specifications
inside Australian territory
outside Australian territory

11. 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

12. 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

13. 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

14. 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

15. 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