CEN10LA189

NTSB accident investigation · Embraer ERJ 170-100 SE · Runnells, IA · April 3, 2010

Accident · Serious injuriesLimited investigationFinal report
Date
April 3, 2010, 06:38 local (11:38 UTC)
Place
Runnells, IA
Injuries
1 serious, 29 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
N869RWEmbraer ERJ 170-100 SE
Defining event
Enroute-cruise: Clear air turbulence encounter
Weather
Visual (VMC) · Day
Status
Completed · report August 12, 2010
Report
Approved by Office Director
NTSB office
Central Region
Parties
Republic Airlines, Federal Aviation Administration - Milwaukee FSDO
FAA report
20100403031959A
Case key
75649

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

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Probable cause

A clear air turbulence encounter during cruise flight, during which an unrestrained cabin flight attendant sustained a hip fracture.

Findings · 1

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 personnelAll aircraft: 78 casesProbable cause

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

The flight crew had been advised by air traffic control that there were multiple reports of light-to-moderate turbulence along the intended route of flight. While in cruise flight at 31,000 feet, the captain noted a change in wind direction and speed and subsequently asked the cabin flight attendants to be seated. Shortly after the captain's request, the airplane encountered moderate turbulence before the flight attendants were able to fasten their lap belts. One of the flight attendants was thrown from her seat and sustained a hip fracture and a head contusion. According to flight recorder data, the maximum and minimum vertical accelerations during the turbulence event were 1.902 g and -0.199 g, respectively. The flight continued to its intended destination without further incident. The flight was met by paramedics who transported the injured flight attendant to a local hospital for treatment.

Factual narrative

On April 3, 2010, at 0638 central daylight time, an Embraer ERJ 170-100 SE, N869RW, operated as Republic Airlines Flight 1501, encountered moderate clear-air turbulence while in cruise flight at 31,000 feet (FL 310) over Runnells, Iowa. A cabin flight attendant, who was seated but unrestrained, sustained a hip fracture and a head contusion during the turbulence encounter. The commercial flight was being operated under the provisions of 14 Code of Federal Regulations (CFR) Part 121 while on an instrument flight plan. The remaining flight crewmembers and 26 passengers were not injured. The flight departed Eppley Field (KOMA), Omaha, Nebraska, at 0540 and was enroute to General Mitchell International Airport (KMKE), Milwaukee, Wisconsin. According to Republic Airlines, air traffic control had issued multiple advisories for light-to-moderate turbulence during the accident flight. The flight encountered light-to-moderate turbulence between 29,000 feet and its assigned cruise altitude of 31,000 feet. While in cruise flight, the captain noted a change in wind direction/speed and subsequently asked the cabin flight attendants to be seated. Shortly after the captain’s request, the airplane encountered moderate turbulence before the flight attendants were able to fasten their lap belts. The injured flight attendant was thrown from her seat and sustained a hip fracture and a head contusion. According to flight recorder data, the maximum and minimum vertical accelerations during the turbulence event were 1.902 g and -0.199 g, respectively. The flight continued to its intended destination without further incident. The flight was met by paramedics who transported the injured flight attendant to a local hospital for treatment.

Aircraft

Registration
N869RW
Reported as
Embraer ERJ 170-100 SE
Category
Airplane
Serial number
17000133
Airframe hours
9,495
Engines
General Electric CF34-8E5, 14,510 lbs thrust, turbo fanGeneral Electric CF34-8E5, 14,510 lbs thrust, turbo fan
Damage
No damage
Flight
Part 121
Operator
Republic Airlines, doing business as Midwest Airlines
Registered owner
Shuttle America Airlines
Airworthiness certificate
Standard, Transport
Last inspection
Continuous airworthiness · February 21, 2010
Departed
KOMA · Omaha, NE
Destination
KMKE · Milwaukee, WI
Flight plan
IFR

Flight crew · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
37
Injuries
None
Certificates
Commercial, Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
September 1, 2009
Seat
Left
Flight hours
7,500 total · 2,500 in this make and model
Role
Co-pilot
Age
30
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
January 18, 2010
Seat
Right
Flight hours
2,650 total · 1,200 in this make and model · 800 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Wind
220° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
37 °F, dew point 30 °F
Altimeter
29.78 inHg
Observed at
KDSM, 14 nm away

Docket · 1

The files NTSB released with the investigation on May 26, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.1 MB in all.

FAA reports on this event · 1

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