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MrMD11 09-18-2012 02:26 AM

TWA Flight 841
 
This is a YouTube video that someone just recently posted onto YouTube. This video was a CBS Special that was originally filmed almost thirty years ago about TWA Flight 841.

Both my Father and Grandfather flew with Hoot Gibson while flying for TWA - both described Hoot as a class-act.

Hope you get a chance to watch the video below.

The Plane That Fell From The Sky (Full Version) TWA 841 - YouTube

neilc777 09-18-2012 04:52 AM

Re: TWA Flight 841
 
After all these years, you would think that Hoot would have owned up to he fact that he commanded flaps to 1. I never have and never will buy the "uncommanded deployment" line the crew fed the NTSB(neither did they). A failure in one actuator? Maybe. A simultaneous failure of four slat actuators causing all four slats to move, just as would happen if the handle was moved to the 1 detent? OoooooooK! Hoot said #7 failed, but never could offer an explanation of how 2,3, and 6 managed to deploy as well!

That said, it was still an amazing piece of flying and whatever problems he caused, he made up for them with superior airmanship.

Interesting to note that there was another disaster involving TWA 841. Weird.

doug seeley 09-19-2012 09:35 AM

Re: TWA Flight 841
 
The Plane That Fell From The Sky (Full Version) TWA 841 - YouTube[/QUOTE]

Great CBS program on YouTube - thanks for the link. Later, Doug

Kozmania 09-20-2012 01:05 AM

Re: TWA Flight 841
 
Quote:

Originally Posted by MrMD11 (Post 982363)
This is a YouTube video that someone just recently posted onto YouTube. This video was a CBS Special that was originally filmed almost thirty years ago about TWA Flight 841.

Both my Father and Grandfather flew with Hoot Gibson while flying for TWA - both described Hoot as a class-act.

Hope you get a chance to watch the video below.

The Plane That Fell From The Sky (Full Version) TWA 841 - YouTube

I've never seen this until now and didn't know much of the story behind this incident. Amazing what the crew was able to pull off but sad that we'll never know what actually happened at FL390. Thanks for posting, MrMD! A great find!

MrMD11 09-20-2012 11:45 PM

Re: TWA Flight 841
 
Quote:

Originally Posted by neilc777 (Post 982385)
That said, it was still an amazing piece of flying and whatever problems he caused, he made up for them with superior airmanship.

Based on the video, I don't see how you can automatically draw a conclusion that "he caused" the situation that that flight found itself in. An erased voice recorder, in this case proved to be a double-edged sword - it could imply guilt or it could prove innocence as well.

neilc777 09-21-2012 04:34 AM

Re: TWA Flight 841
 
Quote:

Originally Posted by MrMD11 (Post 982872)
Based on the video, I don't see how you can automatically draw a conclusion that "he caused" the situation that that flight found itself in. An erased voice recorder, in this case proved to be a double-edged sword - it could imply guilt or it could prove innocence as well.


I didn't have to watch the video as I've read the NTSB Report on TWA 841 some time ago. I've drawn my conclusions based on the report as well as my own personal knowledge(I'm an airline mechanic with some 727 experience);with a little logic and common sense throw in for good measure.

If you have time, I do recommend perusing the report. A good place to start is section 1.17.1 and 1.17.2 if you're unfamiliar with the 727's flap/slat system. The latter section probably debunks something I'm sure your video alleges - namely that failures of slat actuators are commonplace. While that is somewhat true, the failures always occur with intended slat movement(ie slats don't retract/extend when commanded, essentially causing slat disagree) and never cause uncommanded slat movement. Section 2.4, pg 23 of the report outlines what it takes to cause an uncommanded extension of a slat/slats.

My personal theory, which agrees with 95% of the report:

In cruise, the pilots employed a well known trick that increases fuel efficiency. Said trick is: 1)pulling the leading devices circuit breakers to keep the slats from extending because 2) the flaps are then set to the 1, or 2 position. At this setting, the flaps don't droop at all, they only increase wing area, providing more lift.

Either the wrong combination of breakers were pulled(more likely), or they were inadvertently reset by the FE(less likely) because the #2,3,6 and 7 slats extended with the flaps. Upon realizing the gaffe, the pilots quickly selected flaps back to zero. Slats 2,3, and 6 retracted but 7 remained extended due the aerodynamic stresses exacerbating a pre-existing misrig of the slat, causing to it to jam. The increased aerodynamic forces in the dive ripped the slat away as the airplane was doing approximately the speed of sound. Immediately after landing, the CVR was erased.

I have no dog in this fight and I'm not one prone to conspiracy theories. To the contrary, I'm a skeptic and this incident is a good application of Occams Razor.


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