Thu, Oct 16, 2008
Engines Should Be Pulled From Service Pending Checks, Board
As a result of its ongoing investigation of an incident
involving a Pratt & Whitney PW2037 engine experiencing an
uncontained failure, the National Transportation Safety Board
issued an urgent recommendation Thursday to the Federal Aviation
Administration to require all Pratt & Whitney PW2037 engines be
removed from service for inspection of the second stage turbine
hubs when they have accumulated significantly fewer hours (10,880)
and/or cycles (4,392) than the incident engine.
On August 6, 2008, Delta Air Lines flight 624, a Boeing 757-232
equipped with PW2037 engines, experienced an uncontained failure of
the right engine’s high pressure turbine second stage hub at
McCarran International Airport in Las Vegas, NV.
According to the pilots, at the start of the takeoff roll they
heard a loud bang and observed that the right engine had lost
power. The pilots rejected the takeoff and the airplane returned to
the gate. All 166 passengers and the crew of four deplaned. There
was no fire or injuries.
Examination of the incident airplane’s right engine
revealed a hole in the bottom of the core cowl that was in line
with a hole through the engine’s high pressure turbine. The
inspection also revealed missing lugs and cracks in the turbine
hub. Additionally, the Safety Board learned that at least four
other PW2037 second stage turbine hubs have had cracks in the blade
retaining lugs. And, NTSB has also learned that, during a routine
overhaul, an American Airlines PW2037 second stage turbine hub with
cracks in two adjacent blade retaining lugs was reported. The
Safety Board has requested information on all of these
"These discoveries raise serious concerns and warrant immediate
action by the FAA," said NTSB Acting Chairman Mark V. Rosenker. "A
string of consecutively fractured blade retaining lugs could result
in the simultaneous release of multiple blades, which would exceed
the design capacity of the engine’s cases and result in an
uncontainment. Preventive safety measures must be taken."
The NTSB issued a second recommendation Thursday that would
require a continuing inspection schedule for the hubs until the
cause of previous instances of cracking is found and corrective
action is identified.
The Safety Board is still investigating this incident.
Also: Eclipse Improvements, AEA Urges NextGen GA Fund Adoption, FAA OKs External Cams, GA Accident Rate Declines The FAA has granted an STC to Cool City Avionics for the installati>[...]
Also: Chris Heintz, Lear 70/75 Certs, Beluga Birthday, Leap Frogs 9/11 Jump Cancelled, Lawyers Sue NTSB The Commercial Spaceflight Federation congratulates NASA and the winners of >[...]
Avidyne's Long-Awaited IFD540 Finally Gets A Chance To Show Its R9 Roots If you are looking for the bells and whistles of modern avionics you missed an opportunity if you were not >[...]
ASTM International ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of i>[...]
Basic empty weight includes the standard empty weight plus optional and special equipment that has been installed.>[...]