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NTSB Report
May 24, 1989 · Boeing 727-247 · N296WA
Denver, CO
Overview
Report Status
Probable Cause
Event Type
Incident
Date
May 24, 1989
Injury Outcomes
No injuries (121 uninjured)
Location
Denver, CO
Aircraft
Boeing 727-247
Tail Number
N296WA
Operator
Delta Air Lines
Injuries
None
Aircraft Damage
Minor
NTSB Number
DEN89IA124
THE LEFT MAIN LANDING GEAR COLLAPSED AS THE AIRCRAFT WAS PULLED FORWARD SLIGHTLY TO BRING THE NOSEWHEEL OFF THE CHOCKS PRIOR TO PUSHBACK. INSPECTION DISCLOSED A FRACTURE OF THE FORWARD TRUNNION BEARING SUPPORT FITTING (P/N 65-16206-11) AND HEAVY SURFACE CORROSION. MICROSCOPIC EXAMINATION DISCLOSED EXTENSIVE INTERGRANULAR STRESS CORROSION, AND A CRACK THAT HAD DEVELOPED 0.1 INCHES INBOARD FROM THE FORWARD EDGE OF THE BORE, WHICH HAD PROPAGATED APPROXIMATELY 2.1 INCHES AFT INTO THE BORE SURFACE. THE FINAL FRACTURE RESULTED FROM DUCTILE SEPARATION.
NTSB Probable Cause
FAILURE OF THE LEFT MAIN LANDING GEAR FORWARD TRUNNION BEARING SUPPORT FITTING DUE TO A CRACK INITIATING AT THE FORWARD EDGE OF THE BORE AND PROPAGATING BY INTERGRANULAR STRESS CORROSION INTO THE BORE SURFACE THAT RESULTED IN AN EVENTUAL DUCTILE FRACTURE.
Full Narrative
THE LEFT MAIN LANDING GEAR COLLAPSED AS THE AIRCRAFT WAS PULLED FORWARD SLIGHTLY TO BRING THE NOSEWHEEL OFF THE CHOCKS PRIOR TO PUSHBACK. INSPECTION DISCLOSED A FRACTURE OF THE FORWARD TRUNNION BEARING SUPPORT FITTING (P/N 65-16206-11) AND HEAVY SURFACE CORROSION. MICROSCOPIC EXAMINATION DISCLOSED EXTENSIVE INTERGRANULAR STRESS CORROSION, AND A CRACK THAT HAD DEVELOPED 0.1 INCHES INBOARD FROM THE FORWARD EDGE OF THE BORE, WHICH HAD PROPAGATED APPROXIMATELY 2.1 INCHES AFT INTO THE BORE SURFACE. THE FINAL FRACTURE RESULTED FROM DUCTILE SEPARATION.
Flight
Event TypeIncident
Event Time08:05 MDT
Nearest AirportStapelton Int'L (0nm N)
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 727-247
Tail NumberN296WA
Aircraft CategoryAir
DamageMinor
OperatorDelta Air Lines
Operating RulePart 121
Engines3
Engine TypeTurbofan
Engine DetailsP&W · JT8D-15 · Turbofan · 15000
Seats157
People & Injuries
Injury SummaryNo injuries (121 uninjured)
Fatal0
Serious0
Minor0
Uninjured121
Total121
Crew 1Age 50 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind90° @ 8 kt
Visibility60 sm
CeilingNone
Temperature / Dew Point68 F / 30 C
Altimeter29.00 inHg
Observation Time14:24
Weather SourceWFAC