South Africa - Aircraft Stalls as Skydivers Prepare to Jump
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South Africa - Aircraft Stalls as Skydivers Prepare to Jump
Didn't see this one posted, apologies if it's a repeat:
Quote: "Incident info released for general information and educational purposes to the aviation community by videographer Bernard Janse van Rensburg, with the full knowledge of the drop zone operations.
The Beechcraft C90 King Air was trimmed up for the exit procedure at an altitude of 16000’ AGL for the second load of a planned 20x jump event. We opened the door and began the climb out. As is normal, the skydive team was fully focused on achieving correct positioning and exit timing. This intense focus on task resulted in many of the skydivers missing the tell-tale signs of an imminent stall.
From the videographer exit position (outside, most tail-ward end of the jumper line) I felt the plane 'slip' once and then twice after which I knew something was wrong and decided to let go of the now banking aircraft. This all happened inside of just a few seconds. Those on the outside of the door and immediately inside of the door followed. With 9 of us initially in the sky, there were still 5 skydivers inside of the aircraft.
The moment was surreal and I could not believe what I was seeing. Everything happened in slow-motion and I remember thinking 'am I really seeing the plane spinning nose down next to us'. After the spin, the aircraft started to veer underneath us but luckily did not make contact. As the aircraft started to recover from the stall (still unstable) one further skydiver exited, leaving 4 skydivers and the pilot in the aircraft.
After I was satisfied that the aircraft had recovered (it is a fascinating and unusual thing to see your jump aircraft below you in freefall), I searched the sky for my team and found them building the pre-planned formations in a safe and normal manner. The aircraft returned and landed safely on the runway. The incident was promptly reported to the South African CAA and PASA national safety and training officer. The next day the jump team made adjustments to their exit procedure following discussion with the pilot and no further incidents or near-incidents were experienced."
Quote: "Incident info released for general information and educational purposes to the aviation community by videographer Bernard Janse van Rensburg, with the full knowledge of the drop zone operations.
The Beechcraft C90 King Air was trimmed up for the exit procedure at an altitude of 16000’ AGL for the second load of a planned 20x jump event. We opened the door and began the climb out. As is normal, the skydive team was fully focused on achieving correct positioning and exit timing. This intense focus on task resulted in many of the skydivers missing the tell-tale signs of an imminent stall.
From the videographer exit position (outside, most tail-ward end of the jumper line) I felt the plane 'slip' once and then twice after which I knew something was wrong and decided to let go of the now banking aircraft. This all happened inside of just a few seconds. Those on the outside of the door and immediately inside of the door followed. With 9 of us initially in the sky, there were still 5 skydivers inside of the aircraft.
The moment was surreal and I could not believe what I was seeing. Everything happened in slow-motion and I remember thinking 'am I really seeing the plane spinning nose down next to us'. After the spin, the aircraft started to veer underneath us but luckily did not make contact. As the aircraft started to recover from the stall (still unstable) one further skydiver exited, leaving 4 skydivers and the pilot in the aircraft.
After I was satisfied that the aircraft had recovered (it is a fascinating and unusual thing to see your jump aircraft below you in freefall), I searched the sky for my team and found them building the pre-planned formations in a safe and normal manner. The aircraft returned and landed safely on the runway. The incident was promptly reported to the South African CAA and PASA national safety and training officer. The next day the jump team made adjustments to their exit procedure following discussion with the pilot and no further incidents or near-incidents were experienced."
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The next day the jump team made adjustments to their exit procedure following discussion with the pilot
Gnome de PPRuNe
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I believe on one occasion Martin Caidin inadvertently spun his Ju-52 while parachutists swarmed out onto the wing (it survived to delight joyriders with Lufthansa for many years and I regret not managing to get a seat on flights out of London City before it became grounded...)
I believe on one occasion Martin Caidin inadvertently spun his Ju-52 while parachutists swarmed out onto the wing (it survived to delight joyriders with Lufthansa for many years and I regret not managing to get a seat on flights out of London City before it became grounded...)
Wow - kudos to the pilot for there being a 'next day' drop !
A good two or two and a half turns of spin and some interesting wing rocks during recovery - perhaps because the pilot was pulling hard to try to stay within the flap limits as (presumably) the flaps motored up.
A good two or two and a half turns of spin and some interesting wing rocks during recovery - perhaps because the pilot was pulling hard to try to stay within the flap limits as (presumably) the flaps motored up.
Memory is foggy about the details, but there was a crash like this near Seattle back in the late 1980s - IIRC a couple of the jumpers still managed to get out after the aircraft went into a spin, but most were killed in the resultant crash.
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due to one engine spooling up more quickly than the other..
As for the DC-3, they have stall characteristics which must be understood, and trained, as the design precedes today's standards for handling. I have errantly done exactly what that video shows, during stall testing of a modified turbine DC-3, yes, it's a thing. Again, everyone crowded at the back of the cabin is terribly destabilizing, and a DC-3 is particularly vulnerable to this!
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The added challenge of spins in more "sleek" airplanes is that they build up speed very quickly on the way down. The vertical attitude, combined with the buildup of speed causes pilots to want to recover too early, though too late will assure an exceedance. I did a spin program on a modified Cessna Grand Caravan, and without the G meter I installed for the testing, I would have certainly exceeded Vne during the post recovery dive. A "normal" spin recovery in the Grand Caravan at forward C of G and near gross weight was 2.5G pull, and just about Vne, meaning that not pulling the 2.5 would have assured exceeding Vne. The aft C of G spins were an entirely different thing!
The King Air had almost full aileron by the time the jumpers got ready to leave . Hence the left wing stalling more than the right inducing the roll over spin entry . Usually close to a stall in a King air you get a lot of buffeting and loss of lift before any change in attitude . Interesting to watch the rolling moment as the left wing is more stalled by the aileron than the right wing .
Airspeed is life
Airspeed is life
Loss of control on the jump run is some thing that should be foremost in the pilots mind. It's not a unknown event, pilot might like to think how he is going to get out as well if all turns to worms, it's why these days he has to wear a parachute, not the case in my day.
Skydiving accident.
https://www.atsb.gov.au/publications...101903_001.pdf
Video of the above accident taking place, note the height when the pilot gets out.
Skydiving accident.
https://www.atsb.gov.au/publications...101903_001.pdf
Video of the above accident taking place, note the height when the pilot gets out.
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it's why these days he has to wear a parachute,
It would be very difficult to egress a plane with no pilot door or hatch . Getting out while being thrown about might take a lot of altitude and having a plan of what if’s . How to use your legs in a g load situation as your arms might not have enough strength to pull you out .
The first king air video shows a tenth person exiting northbound as the plane is recovering heading east .
EFS
The first king air video shows a tenth person exiting northbound as the plane is recovering heading east .
EFS
Drain Bamaged
Pure pilot bashing....
I went very, very close to stall a Beech 18 one time during a jump run and for the exact same reason, way too many far back.
It's a strange feeling when you push your elevator all the way forward to its stop and the aircraft is doing the exact opposite.
Last edited by ehwatezedoing; 4th Nov 2021 at 14:38.