FIRST THINGS FIRST, it’s important to employ my usual post-crash disclaimer: When planes go down, initial speculation is often misguided and wrong. Early clues that appear straightforward and revealing turn out to be complicated and unclear.

All we know for certain is that China Eastern flight 5735 was cruising at 29,000 feet when something went disastrously awry. The jetliner, with 132 people aboard, fell into a high-speed plunge. Radar reports show that it leveled off briefly at around 8,000 feet, began a brief climb, then fell into a second plunge from which it never recovered, disintegrating into hilly terrain near the city of Wuzhou. There were no survivors.

The severity of the plunges, which were tracked by air traffic control radar, together with harrowing security camera footage showing the stricken jet in a vertical dive, offer some of those clues that we need to be careful with. Whatever went wrong, it happened quickly and catastrophically. There was no distress call.

This tells us a lot, but also it tells us nothing. Any number of things is possible, from a bomb to a flight control system somehow gone haywire. One cause being thrown around is “structural failure.” Did some portion of the tail or a stabilizer separate from the aircraft? Perhaps. But if so, why? Design flaw, faulty repair, explosive decompression? There can be layers to these things.

That the descent was temporarily arrested is the most interesting part. It suggests the pilots were able to maintain or regain some semblance of control, at least briefly. This lessens the probability of certain scenarios — a bombing or major structural failure, for example, the results of which tend to be a more consistent sort of plummet. Yet nothing can be ruled out entirely. A friend of mine even came up with a pilot suicide hypothesis that, although extremely unlikely, is nonetheless plausible

The plane was a Boeing 737-800. The -800 is one of the “Next Generation” (NG) 737 variants. It first flew in 1997, and today is one of the most popular jetliners in the world.

The 737-800 is not equipped with the stall avoidance system that led to the 737 MAX crashes a few years ago, but the jet has had a few problems over the years:

In 2005, a group of former Boeing employees filed a lawsuit claiming that some Next Generation 737s had been manufactured with defective parts. These parts, it was contended, may have contributed to the fuselage breakups of a Turkish Airlines 737 outside Amsterdam in 2009, and the nonfatal runway overrun of an American Airlines 737 in Jamaica that same year. The ex-employees lost their case, as well as their appeal. Investigators, including the NTSB, found no link between faulty parts and structural failure.

In 2019, fatigue cracks were discovered in the wing-fuselage attachment sections of approximately five percent of the global 737NG fleet, leading to a series of mandated inspections and repairs. But this applies primarily to older -800s that have exceeded a particular number of flight hours and cycles (takeoffs and landings). The airplane that crashed in China was only seven years-old.

A rudder defect was blamed for at least two 737 disasters in the 1990s, plus a number of nonfatal incidents. These were earlier-generation variants, however, and the plane’s rudder servo system was redesigned.

You might also come across articles highlighting the high number of incidents and accidents involving 737s over the decades. Be wary of how these numbers are presented (usually as raw totals, without meaningful statistical context), keeping in mind that more 737s have been built than any other jet.

And so, there’s nothing at this point to suggest flight 5735 was brought down by a design flaw or potential negligence on the part of the manufacturer. And while I’ve never been much a fan of the 737, it’s not because I consider the plane unsafe. No matter, the wolves are out for Boeing, and have been since the MAX crashes. With the company’s reputation in tatters, this couldn’t have come at a worse time, regardless of who or what is to blame.

“Boeing Faces New Upheaval After Crash of Chinese Airliner,” read a headline in yesterday’s New York Times. “No fault has been found,” the article continues, “but the company, which has been trying to overcome a recent legacy of design and production troubles, is likely to get scrutinized.”

It certainly will be. But let’s maybe not go that route until the facts are in. We live in a time when everyone wants quick and concise answers, I know. But air crash investigations take months, sometimes years. Even then, we don’t always learn the whole story.

NOTES AND WHATNOT:

— China’s domestic airline market is roughly as large as that of the United States. Once much maligned, the country’s aviation safety record has improved considerably over the last two decades and is now considered among the safest. China’s last major accident was a decade ago.

— In the old days, China had only one airline: the Civil Aviation Administration of China (CAAC), which was second only to Aeroflot in size. And like Aeroflot, it was eventually broken up, splintering off dozens of smaller independent carriers. One of those was China Eastern. Based in Shanghai, China Eastern is today the country’s second-largest airline, just behind China Southern, with a fleet of some 600 aircraft and a route structure extending to Europe and North America.

— We can thank the security-industrial complex for these furtive glimpses of crashing planes we’d otherwise never see. Pentagon, etc. Now this one.

— Those puffs of smoke visible in the video look to me like engine compressor stalls. Jet engines will not function properly in a vertical dive, effectively hiccuping.

— One upon a time, a plane crash in a foreign country killing 132 people would have been a relatively minor news story. What happened is obviously tragic, but the amount of attention that crashes receive nowadays helps underscore how rare they’ve become.

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