ETOPS Question

Date:         08 Sep 97 02:03:50 
From:         k_ish <kenish@ix.netcom.com>
Organization: Netcom
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I have a basic (hopefully not dumb) ETOPS question:

Why is there a time element to ETOPS, e.g. 180 minutes?  I have read a
number of very technical articles on ETOPS, and understand the myriad
factors determining ETOPS route of flight- but none of these articles
address my question.

It seems to me as long as you have enough range at the reduced ETOPS
TAS, there should be no time limit.

Thank you in advance for your replies;
Ken Ishiguro