ETOPS/EDTO Planning Calculator
Calculate critical points and diversion requirements for extended operations.
ETOPS/EDTO Time Ratings
| Rating | Max Distance* | Application |
|---|---|---|
| 75 min | ~525 nm | Entry level ETOPS |
| 120 min | ~840 nm | Standard transatlantic |
| 180 min | ~1260 nm | Extended range |
| 240 min | ~1680 nm | Transpacific ops |
| 330 min | ~2310 nm | A350/787 capable |
*Based on 420 kts OEI TAS, no wind
Understanding ETOPS/EDTO
What is ETOPS/EDTO?
Extended-range Twin-engine Operational Performance Standards (ETOPS) - now called Extended Diversion Time Operations (EDTO) by ICAO - allows twin-engine aircraft to fly routes more than 60 minutes from a suitable airport. The approval time indicates the maximum diversion time to a suitable airport.
Equal Time Point (ETP)
The ETP is the point along the route where it takes equal time to reach either alternate airport. It's calculated considering winds and OEI performance.
ETP = D x (GS home) / (GS home + GS continue)
Where D = distance between alternates
Point of No Return (PNR)
The PNR is the point beyond which there is insufficient fuel to return to the departure airport. It's primarily fuel-based but affects ETOPS planning.
Critical Fuel Scenario
ETOPS fuel planning must account for the critical fuel scenario - typically engine failure at the most critical point, combined with depressurization requiring descent to 10,000 ft. This scenario has highest fuel consumption.