United B752 enroute on Sep 19th 2024, TCAS resolution, two passengers injured

Last Update: March 28, 2025 / 11:07:41 GMT/Zulu time

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Incident Facts

Date of incident
Sep 19, 2024

Classification
Accident

Airline
United

Flight number
UA-2428

Departure
Newark, United States

Destination
San Francisco, United States

Aircraft Registration
N12125

Aircraft Type
Boeing 757-200

ICAO Type Designator
B752

A United Boeing 757-200, registration N12125 performing flight UA-2428 from Newark,NJ to San Francisco,CA (USA), was enroute when the crew responded to a TCAS resolution advisory. The aircraft continued to San Francisco for a safe landing on runway 28L.

The FAA reported the aircraft was enroute when the crew responded to a TCAS resolution advisory. One passenger received serious, another minor injuries as result of the maneouver. The occurrence was rated an accident. The timestamp of 18:07Z provided by the FAA suggests, the aircraft was enroute at FL380 over Wyoming, however, no altitude deviation can be seen in FAA radar or ADS-B data at that time.

The airline reported the aircraft was descending towards San Francisco when it needed to slow the descent for another aircraft below. Two passengers were taken to a hospital, one of them had not been in his/her seat.

On Mar 28th 2025 the NTSB released their final report concluding the probable cause of the accident was:

The abrupt pitch control input by the flight crew in response to a TCAS resolution advisory resulted in two serious passenger injuries.

The NTSB analysed:

United Airlines (UA) flight 2428 received a traffic alert and collision avoidance system (TCAS) resolution advisory (RA) while descending to flight level FL310 when enroute to San Francisco International Airport (SFO), San Francisco, California. Two passengers were seriously injured, and two cabin crewmembers sustained minor injuries as a result of the aircraft response to the TCAS alert. The flight was a regularly scheduled domestic passenger flight from Newark Liberty International Airport (EWR), Newark, New Jersey to SFO.

UA2428 was instructed by air traffic control to descend and maintain FL310 for their arrival into SFO. About 500 ft above level off at FL310, the crew received a TCAS traffic alert “traffic, traffic” for an aircraft crossing 1,500 feet below to which, the first officer, as pilot flying, reduced vertical speed on the mode control panel in response. A TCAS RA then immediately annunciated for the same traffic. The pilot flying responded by disengaging the autopilot and auto throttle and pitched the aircraft up following the pitch guidance on the primary flight display. Flight data show pitch increased by about 3° over 1 second and the aircraft descent arrested. Vertical acceleration ranged from 2.3 to 0.6 (g) over 2 seconds during the maneuver.

The seatbelt sign had been turned on in the cabin shortly prior to the TCAS annunciation, however passengers still remained in the lavatories at the time of the maneuver. Two flight attendants were in the forward galley cleaning in preparation for the initial descent announcement. These two flight attendants fell to the floor during the maneuver and sustained minor injuries. There were two passengers in the aft lavatories at the time of the maneuver.

One passenger flew upwards and landed forward fracturing the L2 spinal vertebrae. The other passenger was exiting the lavatory when he flew upwards and landed on his leg resulting in a fractured ankle.

Following the event, the aircraft landed uneventfully. Paramedics met the aircraft at the gate and transported the passengers to the hospital for treatment.
Aircraft Registration Data
Registration mark
N12125
Country of Registration
United States
Date of Registration
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Manufacturer
BOEING
Aircraft Model / Type
757-224
Number of Seats
Agp Subscribe to unlock
ICAO Aircraft Type
B752
Year of Manufacture
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Serial Number
jj m Subscribe to unlock
Aircraft Address / Mode S Code (HEX)
J mebA Subscribe to unlock
Engine Count
I Subscribe to unlock
Engine Manufacturer
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Engine Model
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Engine Type
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Pounds of Thrust
LAhmb Subscribe to unlock
Main Owner
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Incident Facts

Date of incident
Sep 19, 2024

Classification
Accident

Airline
United

Flight number
UA-2428

Departure
Newark, United States

Destination
San Francisco, United States

Aircraft Registration
N12125

Aircraft Type
Boeing 757-200

ICAO Type Designator
B752

This article is published under license from Avherald.com. © of text by Avherald.com.
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