NTSB Issues Recommendations On GE CF34-3B1 Turbofans | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

** Airborne 08.22.14 ** HD iPad-Friendly -- Airborne 08.22.14 **
** Airborne 08.20.14 ** HD iPad-Friendly -- Airborne 08.20.14 **
** Airborne 08.18.14 ** HD iPad-Friendly -- Airborne 08.18.14 **

Thu, Mar 06, 2008

NTSB Issues Recommendations On GE CF34-3B1 Turbofans

Cites Two Recent Blade Failures On CRJ200s

The National Transportation Safety Board issued recommendations Wednesday to the Federal Aviation Administration to address a safety concern raised by two engine failures on Bombardier Canadair Regional Jet CRJ-200 aircraft. The Board states a flaw during the manufacturing process for fan blades led to the two engine failures, and the Board wants procedures set up to remove these blades before another incident occurs. A companion recommendation was sent to the Canadian government.

In both instances -- a July 27, 2006 engine failure on an Air Nostrum CRJ shortly after takeoff from Barcelona, Spain, and a May 24, 2007 engine failure on an Atlantic Southeast airlines CRJ while in cruise flight from Syracuse to Atlanta -- a fan blade on a General Electric CF34-3B1 turbofan engine fractured, causing a loud bang, severe vibration and in one case an engine fire. Both flight crews declared emergencies and landed safely with no injuries.

Examination of the blades showed that they failed due to a material defect introduced during the manufacturing process, according to NTSB investigators. The fan blades were manufactured by Teleflex Aerospace Manufacturing Group, located in Mexico. Teleflex has manufactured more than 28,000 of these blades.

"We are issuing this recommendation because we consider the safety risk associated with this condition to be unacceptably high," NTSB Chairman Mark V. Rosenker said.

The ASA fan blade failed after 4,717 cycles and 5,845 hours, which is very early in a blade's service life, the Board said.

The Board issued six recommendations to the FAA, including that it require GE Aviation to define a reasonable maximum time frame below 4,717 cycles since new for these Teleflex fan blades and require that the blades be removed from service before that limit is exceeded, to require GE to include additional testing in the manufacturing process for those blades, and to require GE to make modifications in its CF34-1/-3 engine design to ensure that high engine vibrations (such as can happen when a fan blade fractures) will not cause the engine to catch fire.

The Board also issued a recommendation to Transport Canada, that country's equivalent to the Department of Transportation, to require Bombardier to redesign the retention feature of the CRJ 100/-200 engine throttle gearbox to ensure that it can withstand the loads generated by a fan blade separation or similar event.

FMI: Read The Recommendations Here And Here (.pdf)

Advertisement

More News

Experimental SpaceX Vehicle Lost In TX Test Flight

As SpaceX Knows, That's Why They Call Them 'Test Flights' Initial Report by ANN Space Correspondent, Wes Oleszewski "So we're 5-for-5 testing on this Grasshopper. Wahoo! But, but t>[...]

Airborne 08.22.14: Russians Nix Global Gyro, Alphabets Fight FAA, F-16s Cracking

Also: Ferguson TFR, Soaring Company's S.O.S., High Altitude Balloons, Remembering Vicki Cruse An attempt to fly the first gyrocopter around the world by Norman Surplus has been foi>[...]

Aero-TV: Honoring Our Legacy - Recrafting Paul’s Game-Changing Baby Ace

A Bit Of History Lovingly Restored To The Sport Aviation World ANN's Michael Maya Charles had to search around at EAA AirVenture 2014 to find this story. The Aeroplane Factory buil>[...]

Airborne 08.22.14: Russians Nix Global Gyro, Alphabets Fight FAA, F-16s Cracking

Also: Ferguson TFR, Soaring Company's S.O.S., High Altitude Balloons, Remembering Vicki Cruse An attempt to fly the first gyrocopter around the world by Norman Surplus has been foi>[...]

ANN's Daily Aero-Linx (08.23.14)

National Association of Priest Pilots The stated purpose of is group is to promote the use of private aircraft as a practical, safe, and efficient tool of the apostolic work of a p>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2014 Web Development & Design by Pauli Systems, LC