coffin corner

[tothelineplz]

Something like that. But I find it hard to believe the slats and LE Flaps would be "torn off" as you put it. Maybe in Airport '77. I can't even begin to speculate about what happened. Just saying what I remember hearing. Airflow problems may exist if the flaps are extended above 20,000 feet. That's what the manual says. I suppose it would be directly proportionate to the amount of "smash" the crew had.

 

[tothelineplz]

By the way...flywithastick all you want but would you mind not quoting me without including the entire text. You remind me of a journalist. Thanks

To all readers:

Please insert the following sentence in FRONT of the quote by stickwhateverhisnameis...

I swear an aging captain once told me.

See how that changes the context? Please respect that and don't change the context of my posts. Thanks agani!

 

[Timebuilder]

Journalist. Ouch.

 

[flywithastick]

By the way Thanks To all readers:

Please change the context of my posts. Thanks agani!

Sure... no problem!

 

[tothelineplz]

Check that...not journalist...cartoon character...Johnny Bravo...WHATEVER!

 

[fulcrum]

hey dudes ! just an humble cfi's 2 cents
Coffin corner occurs at an aircrafts absolute ceiling where the speeds at which mach number buffet and prestall buffet occur are identical
stall speed is a function of IAS and Mach number is a function of the local speed of sound whic itself is a function of temperature
for a constant mach number the IAS decreases with altitude due to decreasing LSS to prevent the IAS from decresing to its stall speed the mach number must be increased
for a constant IAS the mach number increases with altitude due to decreasing LSS and temerature to a point where the IAS exceeds the critical mach number
to prevent the mach number from exceeding critical mach the IAS must be reduced which results in a decreasing mach number so there comes a point at the aircrafts absolute cieling where the aircraft can go no higher because it is bounded on one side by the low speed stall buffet and the other by the high speed buffett because the stall IAs and the critical mach values are equal
this is the coffin corner and it effects the altitude attainable by the aircraft,
usually there is a buffer built in and that is the difference betweeen the absolute and the maximum service ceiling
hope this helps
Fulcrum

 

[DeltaCrownFlyer]

Does coffin corner ever happen on commercial flights? It sounds terrible...