PPRuNe Forums - View Single Post - Why does CASA allow twin engine ETOPS operation at all?
Old 30th Jan 2018, 05:10
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Dark Knight
 
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Originally Posted by 601
I start the count - B777 at Heathrow.
However, considering the circumstances which caused the engine flame-outs a trimotor or 4 engined aircraft may have lost all.

The answer Dick is a question of probabilities. If one reviews the total components of an aircraft most are covered by MTBO (mean time between overhauls and/or MTBF (mean time between failure) determining when such component should be removed for inspection/overhaul or replacement.

Similarly ETOPS is based upon MTBAEF (mean time between all engine failure) predicated on statistical and operational data where the Actuaries consider and define probabilities which the Regulator makes the decision upon.

The total industry is based upon probabilities yet in 2017 we had a year without any airline fatalities.
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