- Date
- September 6, 2011, 12:09 local (17:09 UTC)
- Place
- Cape Coral, FL
- Injuries
- 1 serious, 141 uninjured
- Damage
- No damage
- Phase of flight
- Enroute
- Aircraft
- N936WNBoeing 737 7H4
- Defining event
- Enroute-descent: Turbulence encounter
- Weather
- Visual (VMC) · Day
- Status
- Completed · report February 23, 2017
- Report
- Approved by Office Director
- NTSB office
- Major Investigations Division
- Case key
- 82964
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 encounter with convective turbulence during the descent.
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.
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 September 6, 2011, at about 1209 EDT, Southwest Airlines flight 983, a B737-700, N936WN, encountered turbulence enroute from Chicago Midway International Airport (MDW), Chicago, Illinois, to Fort Lauderdale-Hollywood International Airport (FLL), Fort Lauderdale, Florida. Of the five crew members and 137 passengers on board, one flight attendant received seriously injuries. The airplane was not damaged. According to flight crew statements, air traffic control informed them to expect turbulence from thunderstorms in mid to south Florida. In preparation for the possibility of turbulence, the captain called the flight attendants (FA) and advised them to close the galleys and to be seated and that they would likely be able to complete the cabin cleanup after clearing the weather at 10,000 feet. The flight deviated west of the weather and mostly smooth conditions were experienced for about 20 minutes during the descent. As the flight descended below about 14,000 feet, the flight momentarily encountered "large bumps" and two FAs were thrown to the floor after having just gotten out of their jump seats to finish cleaning up the aft galley. As a result, one FA experienced severe pain in her leg and was unable to complete her duties for the remainder of the flight. The captain was immediately informed of the injured FAs condition and medical assistance was requested to meet the airplane at the gate. After an uneventful landing, the FA was transported to the hospital and diagnosed with a broken leg.
Factual narrative
On September 6, 2011, at about 1209 EDT, Southwest Airlines flight 983, a B737-700, N936WN, encountered turbulence enroute from Chicago Midway International Airport (MDW), Chicago, Illinois, to Fort Lauderdale-Hollywood International Airport (FLL), Fort Lauderdale, Florida. Of the five crew members and 137 passengers on board, one flight attendant received serious injuries. The airplane was not damaged. According to flight crew statements, air traffic control informed them to expect turbulence from thunderstorms in mid to south Florida. In preparation for the possibility of turbulence, the captain called the flight attendants (FA) and advised them to close the galleys and to be seated and that they would likely be able to complete the cabin cleanup after clearing the weather at 10,000 feet. The flight deviated west of the weather and mostly smooth conditions were experienced for about 20 minutes during the descent. As the flight descended below about 14,000 feet, the flight momentarily encountered "large bumps" and two FAs were thrown to the floor after having just gotten out of their jump seats to finish cleaning up the aft galley. As a result, one FA experienced severe pain in her leg and was unable to complete her duties for the remainder of the flight. The captain was immediately informed of the injured FAs condition and medical assistance was requested to meet the airplane at the gate. After an uneventful landing, the FA was transported to the hospital and diagnosed with a broken leg.
Aircraft
- Registration
- N936WN
- Reported as
- Boeing 737 7H4 (7H4)
- Category
- Airplane
- Serial number
- 36643
- Built
- 2009
- Airframe hours
- 8,317
- Engines
- CFM Intl CFM56-7B24/3, 24,000 lbs thrust, turbo fanCFM Intl CFM56-7B24/3, 24,000 lbs thrust, turbo fan
- Damage
- No damage
- Flight
- Part 121
- Operator
- Southwest Airlines
- Registered owner
- Southwest Airlines Co
- Airworthiness certificate
- Standard, Transport
- Last inspection
- Continuous airworthiness · April 25, 2011
- Departed
- KMDW · Chicago, IL
- Destination
- KFLL · Fort Lauderdale, FL
- Flight plan
- IFR
- Equipment
- Stall warning system, Data recorder, Auto-pilot
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
- 58
- Injuries
- None
- Certificates
- Airline transport, Flight instructor
- Airplane ratings
- Single-engine land, Multi-engine land, Single-engine sea
- Instrument ratings
- Airplane
- Medical
- Class 1, Without waivers/limitations
- Seat
- Left
- Restraint
- 5-point
- Flight hours
- 18,500 total · 12,500 in this make and model · 13,500 as pilot in command · 245 in the last 90 days · 87 in the last 30 days · 7 in the last 24 hours
- Role
- Co-pilot
- Age
- 38
- Injuries
- None
- Certificate
- Airline transport
- Airplane ratings
- Multi-engine land, Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, With waivers/limitations
- Last flight review
- November 7, 2010
- Seat
- Right
- Restraint
- 5-point
- Flight hours
- 12,852 total · 3,382 in this make and model · 7,506 as pilot in command · 164 in the last 90 days · 46 in the last 30 days · 0 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 230° at 4 knots
- Lowest ceiling
- 5,000 ft broken
- Temperature
- 81 °F, dew point 72 °F
- Altimeter
- 29.89 inHg
- Turbulence
- Moderate
- Observed at
- KRSW, 27 nm away
Docket · 1
The files NTSB released with the investigation on February 23, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 498 KB in all.