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NTSB Report
January 3, 1986 · Boeing 737-2H4 · N86SW
Dallas, TX
Overview
Report Status
Preliminary report
Event Type
Incident
Date
January 3, 1986
Injury Outcomes
No injuries (44 uninjured)
Location
Dallas, TX
Aircraft
Boeing 737-2H4
Tail Number
N86SW
Injuries
None
Aircraft Damage
Minor
NTSB Number
FTW86MA030
THIS INCIDENT OCCURRED WHEN THE NO. 2 ENGINE EXPERIENCED AN AFT ENGINE MOUNT CONE BOLT FAILURE AND THE SUBSEQUENT FAILURE OF THE SECONDARY SUPPORT LINK (STAINLESS STEEL CABLE). THE FAILURE OF BOTH AFT ENGINE SUPPORT ASSEMBLIES DURING THE TAKEOFF ROLL ALLOWED THE AFT SECTION OF THE ENG TO HANG DOWN TO WITHIN 4' OF THE GROUND. AS A RESULT, THE NO.2 THRUST REVERSER ACTUATOR ASSEMBLY DRUG THE RUNWAY ON ROTATION. IN ADDITION, ONE LEADING EDGE FLAP AND THE FORWARD ENGINE FAIRING WERE SLIGHTLY DAMAGED. THE ACFT SUBSEQUENTLY RETURNED TO THE ARPT AND LANDED WITHOUT FURTHER INCIDENT. METALLURGICAL EXAMINATION OF THE CONE BOLT REVEALED THAT IT FAILED AS A RESULT OF FATIGUE, MOST PROBABLY DUE TO IMPROPER INSTALLATION OF THE BOLT, SPECIFICALLY, THAT IT WAS UNDER TORQUED WHEN THE OPERATOR RE-INSTALLED THE ENG. THE SAFETY CABLE FAILED AS A RESULT OF OVERSTRESS, PROBABLY INDUCED WHEN THE ACFT ENCOUNTERED A ROUGH STRETCH OF RUNWAY DURING THE TAKEOFF ROLL.
Full Narrative
THIS INCIDENT OCCURRED WHEN THE NO. 2 ENGINE EXPERIENCED AN AFT ENGINE MOUNT CONE BOLT FAILURE AND THE SUBSEQUENT FAILURE OF THE SECONDARY SUPPORT LINK (STAINLESS STEEL CABLE). THE FAILURE OF BOTH AFT ENGINE SUPPORT ASSEMBLIES DURING THE TAKEOFF ROLL ALLOWED THE AFT SECTION OF THE ENG TO HANG DOWN TO WITHIN 4' OF THE GROUND. AS A RESULT, THE NO.2 THRUST REVERSER ACTUATOR ASSEMBLY DRUG THE RUNWAY ON ROTATION. IN ADDITION, ONE LEADING EDGE FLAP AND THE FORWARD ENGINE FAIRING WERE SLIGHTLY DAMAGED. THE ACFT SUBSEQUENTLY RETURNED TO THE ARPT AND LANDED WITHOUT FURTHER INCIDENT. METALLURGICAL EXAMINATION OF THE CONE BOLT REVEALED THAT IT FAILED AS A RESULT OF FATIGUE, MOST PROBABLY DUE TO IMPROPER INSTALLATION OF THE BOLT, SPECIFICALLY, THAT IT WAS UNDER TORQUED WHEN THE OPERATOR RE-INSTALLED THE ENG. THE SAFETY CABLE FAILED AS A RESULT OF OVERSTRESS, PROBABLY INDUCED WHEN THE ACFT ENCOUNTERED A ROUGH STRETCH OF RUNWAY DURING THE TAKEOFF ROLL.
Flight
Event TypeIncident
Event Time07:22 CST
Nearest AirportLove Field (0nm N)
Runway31R
Runway Length7753 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 737-2H4
Tail NumberN86SW
Aircraft CategoryAir
DamageMinor
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsP&W · JT-8D-9A · Turbofan · 14500
Seats128
People & Injuries
Injury SummaryNo injuries (44 uninjured)
Fatal0
Serious0
Minor0
Uninjured44
Total44
Crew 1Age 45 · First Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point37 C / 30 C
Altimeter30.00 inHg
Observation Time13:50
Weather SourceWFAC