Re: ETOPS for north pole routes

From:         kls@ohare.Chicago.COM (Karl Swartz)
Organization: Chicago Software Works, Menlo Park, California
Date:         21 Oct 96 02:29:22 
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>>Assuming a ground speed of 900kmh (560 statute miles/hour), 180minutes
>>gives a range of roughly 2700 km.

>But ETOPS distances are based on single engine speeds, not normal speed. I
>don't know what the typical twin jet cruises at on what engine but for the
>light twins I fly, it is about 2/3 of normal cruise speed.

The ETOPS papers I've seen base their analysis on the Boeing 757, with
an engine out speed of 389 kts (448 statute miles per hour).  This is
the value I use for the ETOPS ranges in the great circle mapper, too.

Karl Swartz	|Home
Moderator of sci.aeronautics.airliners -- Unix/network work pays the bills