NTSB Identification: FTW86MA030.
The docket is stored on NTSB microfiche number 31683.
Scheduled 14 CFR SOUTHWEST AIRLINES CO.
Incident occurred Friday, January 03, 1986 in DALLAS, TX
Aircraft: BOEING 737-2H4, registration: N86SW
Injuries: 44 Uninjured.

NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ENGINE INSTALLATION,SUSPENSION MOUNTS..FAILURE,PARTIAL

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ENGINE INSTALLATION,SUSPENSION MOUNTS..FATIGUE

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ENGINE INSTALLATION,SUSPENSION MOUNTS..SEPARATION

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ENGINE INSTALLATION,SUSPENSION MOUNTS..OVERLOAD

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ENGINE INSTALLATION,SUSPENSION MOUNTS..UNDERTORQUED

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

MAINTENANCE,INSTALLATION..IMPROPER..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

AIRPORT FACILITIES,RUNWAY/LANDING AREA CONDITION..ROUGH/UNEVEN

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