CL650/Operations Reference/EDTO & ETOPS
Introduction
EDTO—Extended Diversion Time Operations
ETOPS—Extended-range Twin-engine Operational Performance Standards
- FAA aircraft operating under Part 91 are not subject to EDTO/ETOPS rules.
- FAA aircraft operating under Part 135 with less than 19 seats can operate up to 180 minutes from a suitable diversion airport in still air conditions.
- EASA Part-NCC operations do not have a specific limitation.
- EASA Part-CAT operations allow aircraft with less than 19 seats to operate up to 120 minutes, and 180 minutes with regulatory approval. (CAT.OP.MPA.140 Maximum distance from an adequate aerodrome for two-engine airplanes without an ETOPS approval.)
Planning
The Challenger will cruise at FL200 and 350 kts TAS, single engine in ISA conditions. EDTO/ETOPS entry and exit points are therefore 350 nm from a suitable diversion airport as this represents 60 minutes of flying. The rules permit operation up to 700 nm from a suitable diversion at 120 minutes, or 1050 nm at 180 minutes. This is a planning consideration and calculated in still air.
In flight, Equal Time Points (ETPs) are calculated to deal with contingency scenarios. These are wind corrected and it will be common to find actual diversion times longer than 120/180 minutes. The Challenger 650 FMS cannot perform these calculations, but tools like SimBrief will generate ETP calculations, if required. For manual ETP planning, the following table may prove useful:
| Event | True Airspeed | Flight Level | Fuel Flow |
| Engine Failure | 350 | FL200 | 1000 kg/hr |
| Engine Failure and Depressurization | 380 | FL100 | 1370 kg/hr |
| Engine Failure and Depressurization | 320 | FL100 | 1000 kg/hr |
| Depressurization (Two Engine) | 380 | FL100 | 1300 kg/hr |
| Depressurization (Two Engine) | 320 | FL100 | 1100 kg/hr |