Historic Northrop Flying Wing Crashed After Doing A "Barrel Roll" According To NTSB (Updated) - N-9M in front of the Planes Of Fame hangar.jpg ...

https://www.thedrive.com/the-war-zon...to-ntsb-report

The tragic loss of the only Northrop N-9M flying wing in existence and its pilot
Dave Vopat that occurred on April 22nd in Norco, California happened after the
aircraft executed a barrel roll. You can read our past coverage on the crash and
the history of the ultra-rare N-9M here.


The National Transportation Safety Board's preliminary report on the incident
reads as such:

On April 22, 2019, about 1210 Pacific daylight time, a Northrop N9M airplane,
N9MB, was destroyed when it impacted terrain near Norco, California. The airline
transport pilot was fatally injured. The airplane was registered to and operated
by the Planes of Fame Air Museum under the provisions of Title 14 Code of
Federal Regulations Part 91. Visual meteorological conditions prevailed, and no
flight plan was filed for the personal flight. The local flight originated from
the Chino Airport, Chino, California, about 1202.

Multiple witnesses located near the accident site reported observing the
airplane flying on a northeastern heading at a low altitude when it performed a
"barrel roll." Several witnesses reported that after the maneuver, the airplane
"wobbled [from] side to side" before the airplane's canopy separated. Shortly
after, the airplane entered a steep right turn, and descended into the ground in
a nose low attitude.

Examination of the accident site revealed that the airplane impacted the
outpatient housing yard of the California Rehabilitation Center. The debris path
was about 474 ft in length, 200 ft wide, and oriented on a magnetic heading of
about 124°. All major structural components of the airplane were observed within
the wreckage debris path.

The wreckage was recovered to a secure location for further examination.

Flying wings have notorious stability issues. It wasn't until digital
fly-by-wire flight control systems became a reality that the concept could be
implemented in an operational fashion in the form of the B-2A Spirit.

I have never heard of the N-9M, an antique that was built in the 1940s, doing
barrel rolls at air shows, although that is based on seeing the performance
myself and watching videos of it in the past. Such a maneuver in that airframe
sounds excessively risky, especially if it hadn't been a staple maneuver that
had been repeated many times over at altitude and cleared for air show routines
in the past. The low altitude environment that the aircraft was flying in the
time of the crash would have offered nearly zero chance of a safe recovery after
a departure from controlled flight.

What we don't know for certain at this time is if the maneuver was intentional
or if some unknown circumstance caused a maneuver similar to a barrel roll
before the aircraft departed completely from controlled flight.

The N-9M was scheduled to be a star attraction of the Planes Of Fame air show in
Chino this weekend. We will keep you up to date as more information from the
crash investigation is released.

Author's Note 5/3/19 3:40pm PDT—

I have received some very interesting correspondence about this tragic crash.
Some who are close to the aircraft and its operators have noted that they have
never heard of aerobatics of this kind being done in the aircraft and especially
not at low-level. That is similar to my observations and knowledge about the
aircraft and its operations as noted in the article. In addition, some believe
that a catastrophic issue, like an engine failure while at a high power setting
or a flight control issue, may have caused a maneuver that looked like a barrel
roll, but was totally unintentional. Under such circumstances, it is possible
the pilot partially recovered the aircraft before it flew into the ground. In
other words, the pilot did everything they could to stabilize the situation, but
it just wasn't enough and the aircraft crashed.

Any of these possibilities could very well be true, but all we have to go off of
at this time is the preliminary NTSB report. The final report may take months or
even longer to materialize and may not be fully conclusive in nature.
Regardless, I think it is worth stressing these possibilities along with what
the report directly states.



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