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NTSB Report
May 29, 1991 · Douglas DC-9-32 · N933ML
Kansas City, MO
Overview
Report Status
Probable Cause
Event Type
Incident
Date
May 29, 1991
Injury Outcomes
6 injuries (6 minor injuries), 40 uninjured
Location
Kansas City, MO
Aircraft
Douglas DC-9-32
Tail Number
N933ML
Operator
Midway Airlines
Injuries
Minor
NTSB Number
CHI91IA175
THE INCIDENT AIRPLANE ENCOUNTERED CLEAR AIR TURBULENCE WHILE FLYING IN VISUAL METEOROLOGICAL CONDITIONS AT 10,000' MSL. THE AIRPLANE WAS NOT DAMAGED DURING THE ENCOUNTER AND THE SEAT BELT SIGN WAS ON. SHORTLY AFTER THE ENCOUNTER THE CAPTAIN WAS ADVISED BY THE CABIN CREW THAT THERE HAD BEEN INJURIES IN THE CABIN DURING THE TURBULENCE. THE FLIGHT CONTINUED TO ITS DESTINATION WHERE IT WAS MET BY PARAMEDICS. SIX PERSONS, THREE FLIGHT ATTENDANTS AND THREE PASSENGERS, WERE TRANSPORTED TO A LOCAL HOSPITAL, TREATED FOR MINOR INJURIES AND RELEASED. ONE PASSENGER SEAT BELT SEPARATED FROM ITS ATTACHMENT POINT ON THE SEAT FRAME. EXAMINATION OF THE SEAT BELT SHOWED A DISTORTED KEEPER CLIP ON THE HOOK ASSEMBLY.
NTSB Probable Cause
INADEQUATE DESIGN BY THE MANUFACTURERS. FACTORS ASSOCIATED WITH THE INCIDENT ARE INADEQUATE CERTIFICATION/APPROVAL BY THE FEDERAL AVIATION ADMINISTRATION AND CLEAR AIR TURBULENCE.
Full Narrative
THE INCIDENT AIRPLANE ENCOUNTERED CLEAR AIR TURBULENCE WHILE FLYING IN VISUAL METEOROLOGICAL CONDITIONS AT 10,000' MSL. THE AIRPLANE WAS NOT DAMAGED DURING THE ENCOUNTER AND THE SEAT BELT SIGN WAS ON. SHORTLY AFTER THE ENCOUNTER THE CAPTAIN WAS ADVISED BY THE CABIN CREW THAT THERE HAD BEEN INJURIES IN THE CABIN DURING THE TURBULENCE. THE FLIGHT CONTINUED TO ITS DESTINATION WHERE IT WAS MET BY PARAMEDICS. SIX PERSONS, THREE FLIGHT ATTENDANTS AND THREE PASSENGERS, WERE TRANSPORTED TO A LOCAL HOSPITAL, TREATED FOR MINOR INJURIES AND RELEASED. ONE PASSENGER SEAT BELT SEPARATED FROM ITS ATTACHMENT POINT ON THE SEAT FRAME. EXAMINATION OF THE SEAT BELT SHOWED A DISTORTED KEEPER CLIP ON THE HOOK ASSEMBLY.
Flight
Event TypeIncident
Event Time13:00 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftDouglas DC-9-32
Tail NumberN933ML
Aircraft CategoryAir
OperatorMidway Airlines
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsP&W · JT8D · Turbofan
Seats85
People & Injuries
Injury Summary6 injuries (6 minor injuries), 40 uninjured
Fatal0
Serious0
Minor6
Uninjured40
Total46
Crew 1First Class
Conditions
ConditionsUnknown
LightDaylight
Wind200° @ 11 kt
Visibility10 sm
CeilingNone
Altimeter29.00 inHg
Observation Time17:50
Weather SourceWFAC