General > General Technical Chat
With Travel Halted, What Happens To The Planes?
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langwadt:

--- Quote from: jogri on August 09, 2020, 06:42:06 pm ---
--- Quote from: IanB on August 09, 2020, 06:17:13 pm ---
--- Quote ---which could result in a forced off-airport landing
--- End quote ---

I get the feeling this means "a crash"  :-\

--- End quote ---

No, this means a descent with descent rates that may or may not be fully approved for passenger flights by the airplane manufacturer, followed by a landing at a non-ICAO registered aerodrome. This procedure may be followed by an unscheduled rapid disassembly either during the descent phase or during the landing.

--- End quote ---

and airliner doesn't just fall out of the sky because it loses engine power

langwadt:

--- Quote from: peter-h on August 10, 2020, 07:38:32 pm ---Ignore it; he's playing with you.

That valve jamming is potentially a loss of much or most of the engine power, which is bad news if it happens in both engines at the same time. Google BA038 for example.

--- End quote ---

if the valve gets stuck the compressor stalls and the engine automatically shuts down and cannot be restarted
jogri:

--- Quote from: Rick Law on August 10, 2020, 07:31:02 pm ---Pardon my ignorance, what does "unscheduled rapid disassembly" means?  Is that some kind of airline lingo for the plane falling apart while descending for the landing?  If so, this euphemism totally obscure the reality here.

--- End quote ---

It's a term that is commonly used as an euphemism when a rocket decides to blow up. Afaik no airline uses this term (but SpaceX uses it to describe their landing failures), it's just a joke phrase like "the front fell off".
IanB:

--- Quote from: peter-h on August 10, 2020, 07:38:32 pm ---Ignore it; he's playing with you.
--- End quote ---


--- Quote from: jogri on August 10, 2020, 08:20:32 pm ---It's a term that is commonly used as an euphemism when a rocket decides to blow up.
--- End quote ---

 :palm:
sleemanj:

--- Quote from: WattsThat on August 10, 2020, 03:31:03 pm ---
--- Quote from: paulca on August 10, 2020, 09:24:45 am ---
--- Quote from: IanB on August 09, 2020, 06:17:13 pm ---
--- Quote ---which could result in a forced off-airport landing
--- End quote ---

I get the feeling this means "a crash"  :-\

--- End quote ---

Plausibly, but you'd be amazed at how far a full airliner can glide.... if it has altitude to do so.

--- End quote ---

No doubt you are referring to this example:

https://en.m.wikipedia.org/wiki/Gimli_Glider


--- End quote ---

Gimli might be the more famous, but Air Transat is way more pucker inducing...

https://en.m.wikipedia.org/wiki/Air_Transat_Flight_236

120km glide over the open ocean to the Azores (and they still had to lose excess altitude!).  A good example of how airliners are more like massive self launching sailplanes than we give them credit for.
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