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Colombian fatal 19th March 2023
https://www.dailymail.co.uk/news/art...area-Choc.html
A Colombian military helicopter carrying four service members went down Sunday afternoon, killing all individuals on board, President Gustavo Petro confirmed. Horrifying video posted to social media on Sunday shows the moments the helicopter falls from the sky and into the trees in the Quibdó area in Chocó. The officers on board who were later identified by the country's leader were doing supply work in the area when the aircraft went down due to unknown reasons. 'It is with sadness that I am sorry to report that there were no survivors in the plane crash in Quibdó,' President Petro tweeted out. 'I accompany the families of the CT. Hector Jerez, TE. Julieth Garcia, SS. Johan Orozco and SS. Ruben Leguizamon in this painful moment. We will not leave them alone,' he said in a translated tweet. According to Colombian outlet Vanguardia, the Public Force helicopter crashed around 4pm as the aircraft was flying over the residential area. President Petro confirmed shocking video of the crash on Twitter, telling his nearly seven million followers he had authorized police to move into the area. 'A few minutes ago, an Army helicopter crashed in Quibdó while carrying out supply tasks,' Petro wrote. 'I have given the order to the authorities to move immediately to the area to deal with the emergency and investigate the causes of what happened,' he continued. Less than an hour and a half later, President Petro shared the news of the deaths and the names of those killed while offering their family his thoughts. After the crash, Petro ordered local authorities to continue their investigations. In one video posted to social media Sunday afternoon, the helicopter is seen falling from the sky as the aircraft spins. Another view of the incident shows residents nearby watching in shock and horror as the helicopter falls to the ground. Commander of the Titán Joint Task Force Hector Alfonso Candelario told local press outlets that the crash was a 'tragic accident.' According to Candelario, the aircraft was 'totally incinerated' after hitting the ground. Two bodies were immediately found while officials looked for the other two Army members. |
Tragic. Obviously a very sudden and total loss of yaw control.
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Not good.
But out of interest, does this not come under the heading of an accident or close call? All fixed wing accidents whether a microlight or a 747 appear there, but helos…. It appears not. Having flown both breeds, either will hurt just the same and the lessons from one or the other may just be the vital key to stop another one. Me |
Me,
Here's you a hint..... Rotorheads A haven for helicopter professionals to discuss the things that affect them |
And in the usual thorough manner, the Oz TV report said it was "an engine failure".
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I’m guessing the engine failed at some point.
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TRG departure, Aviation Safety News shows the TRG AND BLADES a long way from the wreckage
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The loss of the whole TR assembly in flight will cause a non trivial CG shift.
Spoiler
Looked like it all happened in a hurry. And then there's the whole "what was that?" moment when it came off and things went pear shaped. Has anyone here flown a Huey, or 212 or similar variant, where the whole darned Tail Gear Box came off? |
Has anyone here flown a Huey, or 212 or similar variant, where the whole darned Tail Gear Box came off? The T/R was pulled to an extreme pitch angle, huge yaw, the blade flapped so far it contacted the pylon and a piece of one blade broke off. The imbalance was so bad, the whole 90 deg gearbox and remaining blades departed the scene. Massive yaw, and big nose down from losing 90 lbs from 30' back. The disc stayed level, however, so with the big change in fuselage attitude, there was a big mast bump, the main rotor separated and on its way out, sliced through the left side of the cabin (and the test pilot), removed the tailboom as well, and the remains fell 1500' inverted to the ground, loss of four lives. The original problem was never solved, and I consider myself fortunate that I was the last person to fly that machine and survive. |
Originally Posted by Ascend Charlie
(Post 11406352)
13 August 1981, Williamtown NSW. A UH-1B Huey was undergoing a test flight to try to determine a problem from a few days prior. For an unknown reason, the cable that operates the T/R pitch change came off its pulley, and wrapped around the T/R drive shaft - in D and H models, this cable was not near the driveshaft.
The T/R was pulled to an extreme pitch angle, huge yaw, the blade flapped so far it contacted the pylon and a piece of one blade broke off. The imbalance was so bad, the whole 90 deg gearbox and remaining blades departed the scene. Massive yaw, and big nose down from losing 90 lbs from 30' back. The disc stayed level, however, so with the big change in fuselage attitude, there was a big mast bump, the main rotor separated and on its way out, sliced through the left side of the cabin (and the test pilot), removed the tailboom as well, and the remains fell 1500' inverted to the ground, loss of four lives. The original problem was never solved, and I consider myself fortunate that I was the last person to fly that machine and survive. |
The US Army no doubt has lots of accident reports about such matters....with probably the AH-1G having more than a fair number of them.
The Huey had Tail Boom and tail rotor gearbox problems (both 42 and 90 degree) down through the early years. I always tried to load the aircraft to as rearward CG as possible with the thought in mind of having as such a loss of cast iron. I know of one fellow that had a 90 degree failure were the entire tail rotor departed but left one blade stuck straight through the Tail Fin from the right side with the butt end sticking out on the right side and the tip sticking out the other. He flew the machine to a safe landing. Key reaction has to be full down collective and careful movement of the cyclic while rolling the Throttle to Idle....and hope you have a fair bit of airspeed when it happens.....or be at a standard low hover. Cyclic movement must be done without causing the Main Rotor striking the tail boom. The shift in CG has to be tremendous and that alone is going to cause a lot of problems. If you can regain control of the aircraft and maintain forward flight, even with a large side slip situation......an approach can be made by use of collective and rotor rpm. I would suggest a shallow approach maintaining airspeed until very low to the landing surface then gradually slow the aircraft until as slow as possible before touching down. Practice using the throttle to vary rotor rpm ahead of time....long before the actual experience pays off in gold. |
Originally Posted by Lonewolf_50
(Post 11406338)
Has anyone here flown a Huey, or 212 or similar variant, where the whole darned Tail Gear Box came off?
NTSB Bell 412 TR GB Loss GOM |
Flatiron
Can’t find the report but Flatiron lost a TGB in the 90s
The CP was on the controls when GB departed The PIC had the insight to block and push forward the cyclic. |
https://cimg2.ibsrv.net/gimg/pprune....c3479596c2.jpg
Here`s one I prepared earlier..58 yrs ago,this month..in Borneo.. t/rotor and g/box departed whilst formating at about 70-80 kts; sudden `Bang` ,and found I was looking at the jungle about 90* to stbd,and with the stick on the aft limit.Put out a `Mayday`,as I thought I`d collided with the other a/c,put the lever down,and spotted a clearing on a small hilltop.Shut down the engine and F/L on the hill,burst a main tyre,which probably stopped the a/c from rolling back,as it had been difficult to `flare,due reduced back stick..A reward was offered to anyone of the locals/friendlies finding bits..95% recovered in a couple of days,;problem was the hub-blade spindle had a long fatigue crack due to poor quality thread cutting at manufacture.A/c was flying again 2 weeks later.....Just a few days after Ihad another F/LDG after engine failure... |
ARDU was looking at an issue on that aircraft, had you guys had an anomaly on the prior flights? The Huey was given a full D Servicing to try to find what happened, no fault found. I took it up to do a Post-D test, followed the checklist, it was the smoothest B in the fleet. I suggested that a REAL test pilot be found to run some tests. A test pilot, passing through Willy at the time, on the way to do a course in Canberra, was given the job, and he was the poor fella in the left seat next day. Subsequent thoughts were that the original bunting problem was caused by the horizontal stabiliser stalling - no more downforce, so over she went. |
This accident:
https://cimg5.ibsrv.net/gimg/pprune....617f1ed0a0.png Almost identical pictures of a separated tail rotor gearbox in an accident 3 years ago: Compressive Creep and the Loss of a UH-1H's Tail Rotor - Aerossurance https://cimg9.ibsrv.net/gimg/pprune....1e1e4dd32e.png |
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