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NTSB Report: Cargo Plane That Crashed Near Anahuac Appears To Have Hit Turbulence

According to the report, “small vertical accelerations” suggest Atlas Air Flight 3591 entered turbulence soon after the pilots had descended to avoid a band of precipitation as they approached Bush Intercontinental  Airport.

This photo shows an aerial view of the debris field left by Atlas Air Flight 3591.

A preliminary report from the National Transportation Safety Board (NTSB) about the deadly plane crash that occurred near Anahuac on February 23 indicates the aircraft appears to have hit turbulence a minute before it entered a steep descent that ended when the plane smashed into Trinity Bay.

According to the report, “small vertical accelerations” suggest Atlas Air Flight 3591 entered turbulence soon after the pilots had descended to avoid a band of precipitation as they approached Houston’s Bush Intercontinental  Airport. The three people aboard the aircraft, two pilots and a passenger, died in the accident.

Seconds after leveling off around 6,200 feet, the cargo plane’s engines surged to “maximum thrust” and it briefly pointed its nose 4 degrees up, according to flight data. The jet then rapidly swung to point 49 degrees downward and began its drop toward the muddy bay, the federal agency said.

NTSB spokesman, Keith Holloway, said the agency is still investigating the underlying cause of the sharp change in pitch. It’s a move that alarmed aviation experts.

“Obviously, going 49 degrees nose down is beyond a radical move,” said Todd Curtis, a former Boeing safety engineer who runs AirSafe.com. “That’s not something an airplane should be doing, especially at that altitude.”

Curtis said it remains unclear whether a problem with the plane’s systems or human action was primarily to blame for the crash. If it’s a technical issue, he said, that could warrant a broader review of the widely-used Boeing aircraft.

The NTSB previously said cockpit audio suggests the pilots lost control while passing over Trinity Bay, about 40 miles east of Bush Intercontinental Airport.

Before the crash, the plane’s stick shaker, which warns of an imminent engine stall, did not activate, according to the NTSB. That means it’s unlikely the pilots pointed the nose down to avoid stalling.

As the plane dropped, the agency said, it accelerated to 495 mph and gradually pulled up to a 20-degree descent. Curtis said this suggests the crew were trying to pull out of steep fall.

The jet, which had been carrying cargo from Miami for Amazon and the US Postal Service, disintegrated upon impact with the shallow bay.

The NTSB said investigators found one of the plane’s engines and some landing gear west of the rest of the debris, which was spread over 350 yards of the swampy area.

Tidal waters carried some parts of the plane and much of its cargo south, and some wreckage was recovered up to 20 miles (32 kilometers) from the crash site, according to the NTSB.

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