|Title:||Loss of Control and Impact with Pacific Ocean, Alaska, Airlines Flight 261, McDonnell Douglas MD-83, N963AS, About 2.7 Miles North of Anacapa Island, California, January 31, 2000|
|Micro summary:||This McDonnell Douglas MD-83 experienced an in-flight upset and crashed.|
|Event Time:||2000-01-31 at 1621 PST|
|Publishing Agency:||National Transportation Safety Board (NTSB)|
|Site of event:||2.7 miles north of Anacapa Island, California|
|Departure:||Licenciado Gustavo Diaz Ordaz, Puerto vallarta, Mexico|
|Destination:||Seattle-Tacoma International Airport, Seattle, Washington, USA|
|Airplane Type(s):||McDonnell Douglas DC-9-83 (MD-83)|
|Type of flight:||Revenue|
|Executive Summary:||Abstract: This report explains the accident involving Alaska Airlines flight 261, a McDonnell Douglas MD-83, which crashed into the Pacific Ocean about 2.7 miles north of Anacapa Island, California. Safety issues discussed in this report include lubrication and inspection of the jackscrew assembly, extension of lubrication and end play check intervals, jackscrew assembly overhaul procedures, the design and certification of the MD-80 horizontal stabilizer trim control system, Alaska Airlines' maintenance program, and Federal Aviation Administration (FAA) oversight of Alaska Airlines. Safety recommendations are addressed to the FAA.|
Executive Summary On January 31, 2000, about 1621 Pacific standard time, Alaska Airlines, Inc., flight 261, a McDonnell Douglas MD-83, N963AS, crashed into the Pacific Ocean about 2.7 miles north of Anacapa Island, California. The 2 pilots, 3 cabin crewmembers, and 83 passengers on board were killed, and the airplane was destroyed by impact forces. Flight 261 was operating as a scheduled international passenger flight under the provisions of 14 Code of Federal Regulations Part 121 from Lic Gustavo Diaz Ordaz International Airport, Puerto Vallarta, Mexico, to Seattle-Tacoma International Airport, Seattle, Washington, with an intermediate stop planned at San Francisco International Airport, San Francisco, California. Visual meteorological conditions prevailed for the flight, which operated on an instrument flight rules flight plan.
The National Transportation Safety Board determines that the probable cause of this accident was a loss of airplane pitch control resulting from the in-flight failure of the horizontal stabilizer trim system jackscrew assembly's acme nut threads. The thread failure was caused by excessive wear resulting from Alaska Airlines' insufficient lubrication of the jackscrew assembly.
Contributing to the accident were Alaska Airlines' extended lubrication interval and the Federal Aviation Administrationís (FAA) approval of that extension, which increased the likelihood that a missed or inadequate lubrication would result in excessive wear of the acme nut threads, and Alaska Airlines' extended end play check interval and the FAA's approval of that extension, which allowed the excessive wear of the acme nut threads to progress to failure without the opportunity for detection. Also contributing to the accident was the absence on the McDonnell Douglas MD-80 of a fail-safe mechanism to prevent the catastrophic effects of total acme nut thread loss.
The safety issues discussed in this report include lubrication and inspection of the jackscrew assembly, extension of lubrication and end play check intervals, jackscrew assembly overhaul procedures, the design and certification of the MD-80 horizontal stabilizer trim control system, Alaska Airlines' maintenance program, and FAA oversight of Alaska Airlines. Safety recommendations are addressed to the FAA.
|Learning Keywords:||Operations - Maintenance|
|Operations - Uncontrolled Flight into Terrain|
|Systems - Elevator, Stabilizer, Rudder, Ailerons|
|Other - Certification|
|Other - Regulatory Oversight|
|Consequence - Hull Loss|
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