Re: UA 777

Date:         07 Dec 98 23:19:25 
From: (Tjarko de Jong)
Organization: Delft University of Technology
References:   1 2
Next article
View raw article
  or MIME structure

On 30 Nov 98 03:07:44 , (H Andrew Chuang) wrote:

>In article <airliners.1998.1774@ohare.Chicago.COM>,
>MAC <> wrote:
>>Am I right in thinking that UA is suffering high costs because of 777
>>engine problems?
>>Out of 8 flights in the last year I have had 4 delays or cancellations
>>because of engine related I unlucky or typical?
>Perhaps you were just unlucky.  The engine dispatch reliability and
>inflight shutdown rate of the P&W engines on UA's B777s are very
>similar to those on other earlier twin-engine planes.  The former rate is
>well into the high 99% range, and the latter is comfortably below the
>ETOPS-required rate of 0.02 per 1,000 engine flight hours.  I don't mean
>to say the engines are problem free (because they are not), but I don't
>believe there are any serious abnormalities.

But the ETOPS rate is for in-flight shutdown, in order to keep this at an high
level you might need more preventive maintanance on the ground. Or more tests.