|Title:||Crashed short, Alaska Airlines, Inc., Boeing 727, N2969G, Near Juneau, Alaska, September 4, 1971|
|Micro summary:||This Boeing 727 crashed while executing a non-precision approach to Juneau.|
|Event Time:||1971-09-04 at 1215 PDT|
|Publishing Agency:||National Transportation Safety Board (NTSB)|
|Site of event:|
|Departure:||Yakutat, Alaska, USA|
|Destination:||Juneau International Airport, Juneau, AK|
|Airplane Type(s):||Boeing 727|
|Type of flight:||Revenue|
|Executive Summary:||Alaska Airlines Flight 1866, a Boeing 727, N2969G, crashed during an instrument approach to Juneau Municipal Airport, Juneau, Alaska, at approximately 1215 PDT, on September 4, 1971.|
The flight had been cleared for a Localizer Directional Aid (LDA) approach to Runway 8 and had reported passing the final approach fix (Barlow Intersection). This intersection is located 10.2 nautical miles west of the airport. No further communications were heard from the flight.
The aircraft struck a slope in the Chilkat Mountain range at about the 2,500-foot level, 18.5 miles west of the airport, and approximately on the inbound localizer course. All 104 passengers and the seven crewmembers were injured fatally. The aircraft was destroyed by impact and isolated postcrash fires.
The National Transportation Safety Board determines that the probable cause of this accident was a display of misleading navigational information concerning the flight's progress along the localizer course which resulted in a premature descent below obstacle clearance altitude. The oriqin or nature of the misleading navigational information could not be determined. The Board further concludes that the crew did not use all available navigational aids to check the flight's progress along the localizer nor were these aids required to be used. The crew also did not perform the required audio identification of the pertinent navigational facilities.
Following this accident, the Board recommended (NTSB Safety Recommendation A-72-14) to the Federal Aviation Administration (FAA) that the public instrument approach procedure for the LDA approach to Juneau, Alaska, Airport be amended to reflect the addition of Distance Measuring Equipment (DME) a s a source of determining the location of fixes on the final approach course of the localizer.
The Administrator has concurred with this recommendation and the appropriate approach charts for the Juneau Airport have been amended to reflect these changes.
The Board further recommends that the FAA continue tests and research in to the effects of possible extraneous harmonics generated by a Coppler VOR transmitter on airborne navigational receivers and associated instrument displays.
|Learning Keywords:||Operations - Airspace - Non-Precision Approach|
|Operations - Charting/Databases|
|Operations - Controlled Flight Into Terrain|
|Systems - Navigation Systems|
|Consequence - Hull Loss|
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