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NTSB Report
September 17, 1992 · Mcdonnell Douglas MD-11 · N90187
Yuma, AZ
Overview
Report Status
Probable Cause
Event Type
Incident
Date
September 17, 1992
Injury Outcomes
No injuries (8 uninjured)
Location
Yuma, AZ
Aircraft
Mcdonnell Douglas MD-11
Tail Number
N90187
Operator
Mcdonnel Douglass
Injuries
None
Aircraft Damage
Minor
NTSB Number
LAX92IA390
MCDONNELL DOUGLAS INSTRUMENTED A FLIGHT TEST MD11 TO EXPLORE TWO PREVIOUS IN SERVICE INCIDENTS OF CENTER MAIN BODY LANDING GEAR DRAG LINK FAILURES. THE TEST PROTOCOL WAS DESIGNED TO REPLICATE THE KNOWN CIRCUMSTANCES OF THE TWO IN SERVICE FAILURES. DURING THE LANDING ON THE TEST FLIGHT, A FAILURE OF THE DRAG LINK WAS INDUCED, WHICH ALLOWED THE CENTER MAIN BODY GEAR TO FOLD AFT DAMAGING THE WHEEL WELL AND ADJACENT SKIN PANELS. EXAMINATION OF THE INSTRUMENTATION DATA REVEALED THAT THE DRAG LINK FAILURE WAS THE RESULT OF A DYNAMIC INSTABILITY OF THE CENTER BODY GEAR DUE TO AN UNFAVORABLE INTERACTION BETWEEN THE CENTER BODY LANDING GEAR AND THE BRAKE CONTROL SYSTEM (INCLUDING THE ANTI SKID AND AUTO BRAKE SUB SYSTEMS). AS A CORRECTIVE ACTION, THE MANUFACTURER DEVELOPED A MODIFICATION TO THE ANTI SKID CONTROL UNIT.
NTSB Probable Cause
AN UNSTABLE INTERACTION BETWEEN THE CENTER BODY MAIN LANDING GEAR AND THE BRAKE SYSTEM.
Full Narrative
MCDONNELL DOUGLAS INSTRUMENTED A FLIGHT TEST MD11 TO EXPLORE TWO PREVIOUS IN SERVICE INCIDENTS OF CENTER MAIN BODY LANDING GEAR DRAG LINK FAILURES. THE TEST PROTOCOL WAS DESIGNED TO REPLICATE THE KNOWN CIRCUMSTANCES OF THE TWO IN SERVICE FAILURES. DURING THE LANDING ON THE TEST FLIGHT, A FAILURE OF THE DRAG LINK WAS INDUCED, WHICH ALLOWED THE CENTER MAIN BODY GEAR TO FOLD AFT DAMAGING THE WHEEL WELL AND ADJACENT SKIN PANELS. EXAMINATION OF THE INSTRUMENTATION DATA REVEALED THAT THE DRAG LINK FAILURE WAS THE RESULT OF A DYNAMIC INSTABILITY OF THE CENTER BODY GEAR DUE TO AN UNFAVORABLE INTERACTION BETWEEN THE CENTER BODY LANDING GEAR AND THE BRAKE CONTROL SYSTEM (INCLUDING THE ANTI SKID AND AUTO BRAKE SUB SYSTEMS). AS A CORRECTIVE ACTION, THE MANUFACTURER DEVELOPED A MODIFICATION TO THE ANTI SKID CONTROL UNIT.
Flight
Event TypeIncident
Event Time22:20 MST
Nearest AirportYUMAINTL (0nm N)
Runway21
Runway Length13299 ft
Runway Width200 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas MD-11
Tail NumberN90187
Aircraft CategoryAir
DamageMinor
OperatorMcdonnel Douglass
Operating RulePart 91
Engines3
Engine TypeTurbofan
Engine DetailsP&W · PW4460 · Turbofan · 60000
People & Injuries
Injury SummaryNo injuries (8 uninjured)
Fatal0
Serious0
Minor0
Uninjured8
Total8
Crew 1Age 47 · First Class
Conditions
ConditionsVMC
LightBright Night
WindCalm
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO