Boeing 737-322 N313UA

Summary

On 1 August 2000 at about 03:15 local time, a Boeing 737-322 registered N313UA was involved in an accident near Chicago, Illinois, United States. 118 people were on board and one was seriously injured. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

1 August 2000 at 03:15

Classification

Accident

Location

Chicago, Illinois, United States

Coordinates

Not recorded

Aircraft

Boeing 737-322

Registration

N313UA

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Boston → Unknown

Aircraft damage

Not recorded

Weather

VMC

Light

Night/Dark

NTSB number

CHI00LA269

1 person was seriously injured.

the evasive maneuver performed by the pilot. A factor was the activation of the collision avoidance system.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

A passenger sustained a serious in-flight injury during an evasive maneuver following a Traffic Alert and Collision Avoidance System (TCAS) warning approximately 20 minutes prior to landing. The weather did not support the presence of clear air turbulence. In a written statement, the copilot stated, "However, shortly thereafter while continuing our descent into Chicago, the Traffic Alert and Collision Avoidance System (TCAS) alerted us to a potential conflict with an aural 'TRAFFIC, TRAFFIC' warning, the EHSI [Electronic Horizontal Situation Indicator] displayed a visual warning as well. ... Almost immediately after the initial Traffic Advisory (TA), a subsequent 'CLIMB, CLIMB, CLIMB' aural warning was issued at approximately 14,000 feet as well as visual warnings on the EHSI and the EADI [Electronic Attitude Director Indicator]. ... The TCAS Resolution Advisory 'RA' commanded a pitch attitude of approximately 5 degrees nose up. Within one minute the TCAS 'CLEAR OF CONFLICT' aural warning was issued and the captain reestablished a descent while I notified ATC [Air Traffic Control] of the RA and our resumption of the descent. ... The captain contacted the flight attendants to ascertain the condition of the passengers and cabin crew. He was informed that one passenger hurt his ankle during the avoidance maneuver, but was not in need of immediate medical assistance." The doctor who treated the passenger stated, "Radiographs were take[n] 01 August 2000 and were significant for a left fibular fracture."

Quoted verbatim from the NTSB record.