Originally Posted by
ElNull
If I'm 180-minute EDTO approved, and I have an engine failure right at the ETP, which is exactly 180 minutes from my selected alternates, am I actually required to fly the company’s OEI diversion speed (say .85/340) to remain within the approved 180-minute limit?
No, the ‘fixed speed’ is just used to define the area of ops and the fuel planning requirements. If things all go wrong in reality, then you can fly however you need to, according to the circumstances.