Originally published at: NTSB Issues 'Urgent Warning' On CFM LEAP-1B Turbofans - AVweb
Alert is to ensure pilots are aware of and properly trained in emergency procedures.
What phenomenal engineering-when you have massive engine damage you get the added bonus of toxic pyrolized oil filling the cabin. And since the cabin pressure won’t change, the O2 masks stay safely tucked away, yet another money-saving feature for the budget conscious airline.
They are not pressure masks, they will not help in a smoke environment.
I would argue this is a non-issue. What happens if an older engine takes a bird strike, doesn’t have any sheer pins, so keeps spinning N1? Extreme vibration, the engine comes apart, and lights on fire. This can suck smoke into the cabin. It’s common practice to cut the bleeds on a dead engine. The only thing that needed clarification here is that although the Leap engines should die after a bird strike, they actually refuse to and keep running instead, in this case you should still cut the bleeds from your severely damaged, but not quite dead engine. Again, this would normally be common practice anyway, they just moved it up the QRH to higher priority.
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