DEN08LA055

NTSB accident investigation · de Havilland DHC-8-202 · Denver, CO · February 3, 2008

Accident · Serious injuriesLimited investigationFinal report
Date
February 3, 2008, 06:59 local (13:59 UTC)
Place
Denver, CO
Injuries
1 serious, 1 minor, 20 uninjured
Damage
No damage
Phase of flight
Enroute
Aircraft
N444YVde Havilland DHC-8-202
Defining event
Enroute-descent: Clear air turbulence encounter
Weather
Visual (VMC) · Day
Status
Completed · report April 30, 2008
Report
Approved by Office Director
Parties
FAA Flight Standards District Office
FAA report
20080203010389A
Case key
67543

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

The encounter with severe turbulence causing serious injury to the flight attendant.

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 · Not specifiedDehavilland DHC-8-202: 1 caseAll 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 was descending from 14,000 feet to 13,000 feet when it encountered severe turbulence. The FASTEN SEATBELTS sign was reportedly illuminated. The captain called the flight attendant on the intercom, but she did not answer. An emergency medical technician (EMT), who was a passenger on the flight, answered and reported the flight attendant was lying on the floor unconscious. The EMT and an off-duty United flight attendant tended to the injured flight attendant. The captain declared an emergency and the airplane landed at its destination. The flight attendant was transported to a hospital with serious injuries.

Factual narrative

On February 3, 2008, at 0659 mountain standard time, a de Havilland DHC-8-202, N444YV, operated by Mesa Airlines as flight 7106 and piloted by an airline transport certificated pilot, was not damaged when it encountered severe turbulence approximately 35 miles northwest of Denver, Colorado. Visual meteorological conditions prevailed at the time of the accident. The scheduled domestic passenger flight was being conducted under the provisions of Title 14 CFR Part 121, and an instrument flight rules flight plan had been filed. The flight attendant was seriously injured and the captain sustained minor injuries. There were no injuries to the first officer and 19 passengers aboard the flight. The flight originated at Casper, Wyoming, approximately 0545, and was en route to DEN.

According to Mesa Airlines, the flight was descending on the RAMMS 5 STAR (Standard Terminal Arrival Route) and was encountering "light chop." The FASTEN SEATBELTS sign was illuminated. Approximately 5 miles inside RAMMS intersection, as the flight was descending from 14,000 feet to 13,000 feet, it encountered severe turbulence. The captain called the flight attendant on the intercom, but she did not answer. An emergency medical technician (EMT), who was a passenger on the flight, answered and reported the flight attendant was lying on the floor unconscious. The EMT and an off-duty United flight attendant tended to the injured flight attendant. The captain declared an emergency and the airplane landed at Denver. The flight attendant was transported to a hospital where she underwent surgery for several fractured vertebrae. It was later determined that the captain had suffered a slight concussion.

Aircraft

Registration
N444YV
Reported as
de Havilland DHC-8-202
Category
Airplane
Serial number
444
Engine
Pratt & Whitney Canada PW123D, 2,000 horsepower, turbo prop
Damage
No damage
Flight
Part 121
Operator
Mesa Airlines, Inc.
Registered owner
Wells Fargo Bank Northwest NA Trustee
Airworthiness certificate
Standard, Transport
Last inspection
Continuous airworthiness · February 1, 2008
Departed
CPR · Casper, WY
Destination
DEN · Denver, CO
Flight plan
IFR

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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
34
Injuries
Serious
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Medical
Class 1, With waivers/limitations
Last flight review
January 1, 2008
Seat
Left
Flight hours
3,700 total · 1,700 in this make and model · 250 in the last 90 days · 125 in the last 30 days · 2 in the last 24 hours
Role
Co-pilot
Age
25
Injuries
None
Certificate
Commercial
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
September 1, 2007
Seat
Right
Flight hours
1,052 total · 699 in this make and model · 287 as pilot in command · 232 in the last 90 days · 73 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 12 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
18 °F, dew point 7 °F
Altimeter
29.64 inHg
Observed at
DEN, 35 nm away

FAA reports on this event · 1

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