NTSB's Final Report on Alaska Air 261 Published | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

** Airborne 04.14.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 04.14.14 **
** Airborne 04.11.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 04.11.14 **
** Airborne 04.09.14--CLICK HERE! ** HD iPad-Friendly Version--Airborne 04.09.14 **

Fri, Jan 17, 2003

NTSB's Final Report on Alaska Air 261 Published

The NTSB has published an exhaustive final report on its investigation into the fatal crash of Alaska Air 261 on January 31, 2000. The accident occured about 2.7 Miles North of Anacapa Island, California and involved a McDonnell Douglas MD-83, N963AS. 

The NTSB's executive summary states that, "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 Administration’s (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."

FMI: http://www.ntsb.gov/publictn/2002/AAR0201.htm

Advertisement

More News

Aero-TV: Active Winglets -- Tamarack Aerospace Partners with Cessna

Innovative Aerodynamic Technologies Produce Game-Changing Results At the NBAA 2013 convention, ANN CEO and Editor-In-Chief, Jim Campbell had a chance to talk with Tamarack Aerospac>[...]

ANN's Daily Aero-Linx (04.16.14)

Seawings The largest flying boat reference web site and home of the flying boat -- in detail -- on the web; specializes in providing information for the scale modeler in the form o>[...]

ANN's Daily Aero-Term (04.16.14): Density Altitude

Pressure altitude corrected for nonstandard temperature. Density altitude is used in computing the performance of an aircraft and its engines.>[...]

Aero-News: Quote Of The Day (04.16.14)

“This upgrade is an important step in laying the foundation for the NextGen system, which provides controllers a much more precise view of the airspace, gives pilots much mor>[...]

ANN FAQ: ANN's News Portal Syndication Program

Get A Customized ANN News Portal For YOUR Website! As we promised, the ever-so-busy software geeks at ANN have been working overtime on a number of cool new tools and toys... and t>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2014 Web Development & Design by Pauli Systems, LC