NTSB Identification: LAX82FA195
Scheduled 14 CFR Part 121: Air Carrier operation of UNITED AIRLINES
Accident occurred Wednesday, May 26, 1982 in SAN FRANCISCO, CA
Probable Cause Approval Date: 05/26/1983
Aircraft: DOUGLAS DC10-10, registration: N1833U
Injuries: 25 Minor,113 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

DURING THE INITIAL PUSHBACK FROM THE GATE PRIOR TO ENG START A LOUD NOISE WAS HEARD & THE ACFT NOSE SLOWLY SETTLED ONTO THE TUG THAT WAS PERFORMING THE PUSHBACK. THE CAPTAIN ORDERED THE ACFT EVACUATED USING THE EMERGENCY SLIDES. THE UPPER JAW OF THE TOWBAR HAD FAILED DUE TO EXTENSIVE STRESS-CORROSION CRACKING. THIS FAILURE RESULTED IN THE TOWBAR IMPACTING THE NOSE LANDING GEAR CAUSING A FAILURE OF THE NOSE GEAR LOWER DRAG LINK UPPER CLEVIS. THE NOSE GEAR THEN COLLAPSED & THE ACFT SETTLED ONTO THE TUG.

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

AIRPORT FACILITIES,RAMP FACILITIES..FAILURE,TOTAL


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