Summary
On August 27, 1990, a Boeing 747-422 (N174UA) was involved in an accident near Los Angeles, CA. The accident resulted in 23 minor injuries, with 320 people uninjured out of 343 aboard. The aircraft sustained minor damage.
The National Transportation Safety Board determined the probable cause of this accident to be: THE FAILURE OF THE MANUFACTURER TO ENSURE THAT THE LANDING GEAR SELECTOR VALVES AND THEIR ASSOCIATED DRUM LINK ASSEMBLIES WERE PROPERLY INSTALLED PRIOR TO DELIVERY OF THE AIRCRAFT. A FACTOR IN THE ACCIDENT WAS THE LACK OF INFORMATION AVAILABLE TO THE CREW CONCERNING THE SECONDARY ALTERNATE GEAR EXTENSION PROCDURE.
This accident is documented in NTSB report LAX90IA305. AviatorDB cross-references NTSB investigation data with FAA registry records to provide comprehensive safety information for aircraft N174UA.
Accident Details
Probable Cause and Findings
THE FAILURE OF THE MANUFACTURER TO ENSURE THAT THE LANDING GEAR SELECTOR VALVES AND THEIR ASSOCIATED DRUM LINK ASSEMBLIES WERE PROPERLY INSTALLED PRIOR TO DELIVERY OF THE AIRCRAFT. A FACTOR IN THE ACCIDENT WAS THE LACK OF INFORMATION AVAILABLE TO THE CREW CONCERNING THE SECONDARY ALTERNATE GEAR EXTENSION PROCDURE.
Aircraft Information
Registered Owner (Historical)
Data Source
Data provided by the National Transportation Safety Board (NTSB). For more information on this event, visit the NTSB Records Search website. NTSB# LAX90IA305