DCA26LA167

NTSB accident investigation · Boeing 787-9 · Pacific Ocean (Pacific Ocean) · March 29, 2026

Accident · Serious injuriesClass 4 · LimitedFinal report
Date
March 29, 2026
Place
Pacific Ocean (Pacific Ocean)
Injuries
1 serious, 164 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
N23994Boeing 787-9
Defining event
Enroute-cruise: Turbulence encounter
Weather
Visual (VMC) · Day
Status
Completed · report August 20, 2026
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Major Investigations Division
Parties
FAA
Case key
202721

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

An unanticipated encounter with clear air turbulence while in cruise flight.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Turbulence: clear air turbulenceEnvironmental issues › Conditions/weather/phenomena · Effect on personnelBoeing 787-9: 1 caseAll aircraft: 78 casesProbable cause
Knowledge: knowledge of meteorologic condPersonnel issues › Experience/knowledge · Flight crewBoeing 787-9: 2 casesAll aircraft: 30 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

On March 29, 2026, about 1456 pacific daylight time (PDT), United Airlines flight 115, encountered moderate turbulence while in cruise flight at FL300 en route to Faa’a (Tahiti) International Airport (NTAA) Papeete, French Polynesia. Of the 164 passengers and crew onboard, one flight attendant sustained a serious injury. The flight was operating under Title 14 Code of Federal Regulations Part 121 as a regularly scheduled international passenger flight from San Francisco International Airport (SFO), San Francisco, California to NTAA. According to the flight crew, dispatch had planned the flight at FL300 due to forecast turbulence between FL320 and FL380 off the California coast. After departure, the flight attendants remained seated until the airplane reached cruise altitude at FL300 and conditions were deemed suitable to begin cabin service. During the first 90 minutes of flight, the airplane encountered intermittent light turbulence, resulting in multiple communications with dispatch and periodic illumination of the seatbelt sign. Dispatch advised that the greatest turbulence risk was expected between latitudes 34°N and 30°N. About 95 minutes after departure, the airplane encountered a jolt of moderate clear air turbulence with no corresponding returns displayed at altitude on the onboard weather radar. The sudden encounter with moderate turbulence resulted in two flight attendants falling. The flight crew immediately directed the flight attendants to be seated and notified dispatch of the turbulence encounter. Dispatch advised that the airplane had recently crossed the subtropical jet stream, a condition unknown to the flight crew at the time. Shortly thereafter, the cockpit was informed that a flight attendant had been injured. Following notification of the injury, the flight crew coordinated with dispatch and MedLink and requested emergency medical services to meet the airplane upon arrival. A physician traveling onboard evaluated the injured flight attendant and recommended diagnostic imaging upon landing. The flight attendant was subsequently transported to a hospital, where they were diagnosed with a serious injury. At the time of the flight’s turbulence encounter there were no active inflight weather advisories or company issued advisories for the area.

Aircraft

Registration
N23994
Reported as
Boeing 787-9
Category
Airplane
Serial number
68622
Built
2025
Airframe hours
4,347
Engines
GE GENX-1B76AP2G01, 76,100 lbs thrust, turbo fanGE GENX-1B76AP2G01, 76,100 lbs thrust, turbo fan
Damage
No damage
Flight
Part 121
Operator
United Airlines Inc
Registered owner
United Airlines Inc
Airworthiness certificate
Standard, Transport
Departed
San Francisco, CA
Destination
Tahiti, OF
Flight plan
IFR
Equipment
ADS-B, Electronic multifunction display, Electronic primary flight display, Onboard weather, Satellite tracking device, Stall warning system, Electronic flight bag or handheld device, Data recorder, Auto-pilot, Angle of attack indicator

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew · 3

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
63
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 1, With waivers/limitations
Last flight review
February 6, 2026
Seat
Left
Restraint
Lap only
Flight hours
14,500 total · 800 in this make and model · 10,000 as pilot in command · 149 in the last 90 days · 66 in the last 30 days · 0 in the last 24 hours
Role
Co-pilot
Age
31
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
March 7, 2026
Restraint
Lap only
Flight hours
5,680 total · 145 in this make and model · 1,331 as pilot in command · 145 in the last 90 days · 65 in the last 30 days
Role
Other flight crew
Flight hours
10,118 total

Weather

Conditions
Visual (VMC) · Day

Docket · 2

The files NTSB released with the investigation on August 20, 2026, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.8 MB in all.

FAA reports on this event · 2

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.