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ETOPS: Time Vs Distance  
User currently offlineTimz From United States of America, joined Sep 1999, 7224 posts, RR: 7
Posted (14 years 7 months 2 weeks 2 days 20 hours ago) and read 2495 times:

We all know there's 120-minute and 180-minute and 207-minute ETOPS, but I've never seen the official word on what speed is to be assumed when we convert the times to distances. Single-engine cruise on a 767 is supposedly 390-400 knots, but does the assumed speed vary from day to day? How much do other twins vary from 400 knots? Do different airlines all assume the same speed from a given type?

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