I diskusjonen som følger under, glemmes en C-130 som havarerte under ganske identiske omstendigheter i 2002:
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Wings Fold On
Ag Plane By - December 12, 2021 What appears to be a practice or demonstration drop by a Brazilian
Embraer EMB-202A Ipanema ended with the wings folding and the pilot surviving
with serious, but not life-threatening, injuries. The Ipanema is an aerial
application plane but this aircraft appears to dump its load rather than
spray it. In the crash sequence, the airplane flies
the centerline of a rough air strip and starts jettisoning a load of liquid
from the belly rather than the application nozzles on the wings. About
halfway through the drop, the aircraft pitches up and the wings fold. Authorities
are undoubtedly investigating. Sjekk video her: https://tinyurl.com/2778v8e5 5
COMMENTS
Looks
like a high-speed run. As the load is dropped the pilot pushes to maintain
altitude, airspeed exceeds the manoeuvring speed and voila, wings depart with
the merest hint of g. A smattering of fatigue may also have been a factor.
Almost analogous to the Phantom pilot at Abingdon, doing a loop he attempted
to re-position on the display line by pushing at the top while inverted – the
airspeed increased to a value which made it impossible for the loop to be
completed successfully, which it wasn’t! What
a tribute to the integrity of the cockpit! IMHO,
you guys have been scammed. Remember the video of the aerobatic pilot who
lost a wing in flight and somehow landed safely? As we now know, the airplane
in that flight sequence was a model. Having been a serious aerobatic
competitor, I cannot imagine a set of circumstances where one wing, LET ALONE
BOTH, fail upwards. Metal fatigue coincidentally reaching a critical point on
both wings at the exact same time? The climb had just begun prior to the
failure, it was not an extreme maneuver, and I doubt that more than a couple
of G’s would have been placed on the airplane. In an ag plane that’s built
for abuse, there’s no way that 2 G’s is going to fold a wing, let alone,
coincidentally, both at the same time. Re exceeding maneuvering speed, it’s
not the speed itself that is dangerous. It’s when ‘full deflection of
controls is applied. There’s no way that the fairly mild initiation of the
climb involved full deflection. Utility aircraft are designed to withstand
4.4 G’s. It would have had to have been an almost immediate pullup to
vertical. o Elevators are in neutral position throughout.
Excellent call, Marshall. I
agree with Marshall Friedman that things don’t quite seem quite right about
this accident. The maneuver during which the wings folded did not appear to
be extreme and should not have overloaded the airframe; however, both wings of
an airplane can fail simultaneously if subjected to a severe overload.
Additionally, depending on the structural design of the airplane, the failure
of one wing could induce the failure of the other; however, I would think
that simultaneous failure is rare indeed. Unless the wreckage shown in the
video is the result of another crash, I’m guessing that this was a real event
involving a real airplane.
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