UPDATE 2-Test mishap forces Pratt to tweak new Airbus engine

Tue Jul 23, 2013 9:51pm EDT
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* Engine nozzle redesigned after cooling problem in test

* Pratt & Whitney says no impact on A320neo schedule, performance

* Airbus confident P&W will meet commitments on revamped jet

* Boeing says completes design for competing 737 MAX 8 aircraft

By Tim Hepher and Alwyn Scott

PARIS/NEW YORK, July 24 (Reuters) - Pratt & Whitney has redesigned a component of a jet engine being developed for Airbus's top-selling A320neo aircraft after tests revealed "distress" in the engine's hot core.

The problem highlights the strict timetable and performance thresholds in one of the aerospace industry's most closely watched developments, but both planemaker and engine designer said they did not expect any delays or drop in fuel savings.

Engine makers routinely push new engines to their physical limits, and well beyond normal operating conditions.

However, Pratt's latest engine is under close scrutiny because it represents the U.S. engine maker's return to the forefront of civil engine manufacturing in a lead role. It is also tied to many billions of dollars in airplane revenues.   Continued...