NTSB: Cloud Shot Up Vertically Before Severe Turbulence On Hawaiian Airlines Airbus A330 - Simple Flying

The United States National Transportation Safety Board (NTSB) released a preliminary report on Friday, January 13, stating that a 'cloud shot up vertically' in front of Hawaiian Airlines flight HA35 on December 18, resulting in 25 injuries onboard.

HA35 was a direct flight from Phoenix Sky Harbor International Airport (PHX) to Honolulu's Daniel K. Inouye International Airport (HNL) carrying 291 passengers and crew. On December 18, just after 10:00, the flight encountered severe turbulence. The aircraft that bore the brunt of the turbulence was an Airbus A330-200 (registration N393HA) received minor damage.

Hawaiian Airlines Airbus A330-243 N373HA

Photo: Vincenzo Pace I Simple Flying

Six serious injuries

Of the 25 injured onboard, 6 had severe injuries, ranging from severe head injuries, lacerations, and bruising, and some had a loss of consciousness. Included in those transported to the hospital was a 14-month-old child. At the time of the incident, the seatbelt sign was activated. However, some passengers were not buckled in.

Conflicting reports state that between 20-35 passengers were injured, and the NTSB has since confirmed the correct number was 25.

Photo: Vincenzo Pace | Simple Flying

Like a 'smoke plume.'

Operating between 37,000 to 38,000 feet, flight conditions were reported as 'smooth' with clear skies ahead and above. The weather radar was on and displayed no severe weather. Within a matter of seconds, a cloud shot up vertically, reported by the NTSB 'like a smoke plume,' and there was no time for the aircraft to change course.

The captain immediately contacted the lead flight attendant to identify that turbulence could be expected. Within 1-3 seconds, the aircraft encountered severe turbulence that would soon lead to multiple injuries.

Source: GCMap

Postaccident examination

Following the accident, an examination of the region's weather identified an occluded frontal system with an associated upper-level trough headed toward Hawaii. Weather radar imagery depicted strong turbulence within the vicinity of HA35.

The US National Weather Service (NWS) had issued a significant warning for thunderstorms in the region, however, before the incident, no other aircraft reported any cause for concern, and no strong turbulence was encountered.

Hawaiian Airlines A330-200 at Honolulu International Airport's Reef Runway Diamond head

Photo: Hawaiian Airlines

Mass casualty emergency

The incident happened 40 minutes before the aircraft's scheduled arrival. Emergency medical services and the American Medical Response responded quickly to Honolulu's Daniel K. Inouye International Airport to meet the arriving aircraft.

N393HA

The nine-year-old A330-200 involved was removed from service briefly. Resuming operations as HA821 from Honolulu to Tokyo Narita International Airport (NRT) on January 6.

Sources: WFTV9

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NTSB: Cloud Shot Up Vertically Before Severe Turbulence On Hawaiian Airlines Airbus A330 - Simple Flying
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