WASHINGTON - The FAA has ordered immediate inspections to prevent the
failure of a critical component on GE engines that power Boeing 787
Dreamliner jets, adding that failure of the component could cause
"possible loss of the airplane."
The order was issued after one
of the GE engines failed during a ground test in South Carolina and
cracks were found in the fan mid shaft of another engine of the same
type two weeks later.
"We are issuing this (directive) because
we evaluated all the relevant information and determined the unsafe
condition ... is likely to exist or develop in other products of the
same type design," says the FAA order, issued Friday.
The
order requires an inspection of the fan mid shaft on all GE GEnx-series
turbofan engines installed on 787 Dreamliners before their next flight.
Periodic re-inspections are required every 90 days or less to check for
possible cracking of the mid shaft.
"This condition, if not
corrected, could result in failure of the (fan mid shaft) resulting in
one or more engine failure(s) and possible loss of the airplane," the
FAA directive said.
Due to the urgency of the problem, the FAA
bypassed the usual 30-day public comment period before an airworthiness
directive takes effect.
"The FAA has found that the risk to the
flying public justifies waiving notice and comment prior to adoption of
this rule based on the reported engine failure, the crack find, and that
the root cause is still somewhat unknown," the FAA's directive said.
The
problem was first noticed when a GE engine failed on a new Dreamliner
as it was undergoing runway tests at the Charleston, S.C., airport on
July 28. Debris was ejected from the engine and fell on the runway,
sparking a small fire and forcing the airport to shut down for about an
hour.
Then on Aug. 14, an ultrasonic inspection on the same part in another 787's engine found cracking.
The
cause of the cracking is not yet determined, but according to the FAA
it "is likely due to environmentally assisted cracking; a type of
corrosive cracking that is time-dependent." The agency is requiring
repetitive inspections at an interval of not more than 90 days.
The FAA said it is working closely with General Electric to resolve the problem.
It
was not immediately clear how many Dreamliners have been equipped with
the GE GEnx-series engines. The FAA's directive said it will affect 11
engines installed on planes of U.S. registry.
The Dreamliner jet
is one of Boeing's most critical products. The company delivered the
first 787 last year following several years of design and production
delays. Airlines set record orders for the jet, as its lightweight,
high-tech design was expected to offer travelers more comfort, provide
airlines significant fuel savings and open up new routes.
Story: http://www.komonews.com
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