Originally Posted by
Rob2160
Tell that to Sullenberger..
It sounds good in theory and I wish it were true in all cases but facts prove otherwise - foreign object ingestion can and does cause engine failures.
The FAA certification standard for a large bird strike (above 1.85Kg - 4.07lbs) in a turbine engine does not require the engine to continue producing power.
It only requires the damage to be contained within the engine and not result in further damage to the aircraft / airframe.
http://rgl.faa.gov/Regulatory_and_Gu.../ac33.76-1.pdf
Even forgetting about the engines, impact damage anywhere on the airframe can also result in a crash e.g. the Concorde - which was brought down by a 10lb piece of rubber hitting the wing.
Wrong standard. The AC which is voluntary only covers engines not required to be certified per CFR 33-77 AKA airliners. Per that standard a large bird is 8 pounds and the standard is as you say, but of course safe shutdown will not bring down a multiengine aircraft. For 5 pound birds as you say the standard is no more than a 50% loss of power. However, many engines exceed the standard and keep providing thrust with large 8 pound birds, and even if the engine shuts down it will not bring down a large multiengine aircraft. The miracle on Hudson flight flew through a large flock of geese probably larger than 8 pounds. But we were discussing sUAF which by definition weigh less than 5 pounds.
http://lessonslearned.faa.gov/ll_mai...41&LLTypeID=10