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Safety Recommendation Details

Safety Recommendation A-93-142
Details
Synopsis: ON MARCH 31, 1993, THE NO.2 ENGINE AND ENGINE PYLON SEPARATED FROM JAPAN AIRLINES, INC., FLIGHT 46E, A BOEING 747-121, THAT HAD BEEN WET-LEASED FROM EVERGREEN INTERNATIONAL AIRLINES, INC., SHORTLY AFTER DEPARTURE FROM ANCHORAGE INTERNATIONAL AIRPORT, ANCHORAGE, ALASKA. THE ACCIDENT OCCURRED ABOUT 1234 ALASKA STANDARD TIME. THE FLIGHT WAS A SCHEDULED CARGO FLIGHT FROM ANCHORAGE TO CHICAGO-O'HARE INTERNATIONAL AIRPORT, CHICAGO, ILLINOIS. ON BOARD THE AIRPLANE WERE THE FLIGHTCREW, CONSISTING OF THE CAPTAIN, THE FIRST OFFICER, AND THE SECOND OFFICER, AND TWO NONREVENUE COMPANY EMPLOYEES. THE AIRPLANE WAS SUBSTANTIALLY DAMAGED DURING THE SEPARATION OF THE ENGINE. NO ONE ON BOARD THE AIRPLANE OR ON THE GROUND WAS INJURED.
Recommendation: THE NTSB RECOMMENDS THAT THE NATIONAL WEATHER SERVICE: USE THE WSR-88D DOPPLER WEATHER RADAR SYSTEM AT ANCHORAGE, ALASKA, TO DOCUMENT MOUNTAIN-GENERATED WIND FIELDS IN THE ANCHORAGE AREA AND TO DEVELOP IN GREATER DETAIL LOW ALTITUDE TURBULENCE FORECASTS.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: ANCHORAGE, AK, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA93MA033
Accident Reports: In-Flight Engine Separation Japan Airlines, Inc., Flight 46E Boeing 747-121, N473EV
Report #: AAR-93-06
Accident Date: 3/31/1993
Issue Date: 11/15/1993
Date Closed: 4/15/1998
Addressee(s) and Addressee Status: United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service (Closed - Acceptable Action)
Keyword(s): Weather, Turbulence

Safety Recommendation History
From: NTSB
To: United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service
Date: 4/15/1998
Response: As of January 1, 1996, the Alaska Aviation Weather Unit has routinely used the WSR-88D facility at Kenai, Alaska. This facility has enhanced the capability to provide accurate and timely warnings of and to investigate severe turbulence events in the Anchorage area. Based on the NWS's actions, Safety Recommendation A-93-142 is classified "Closed--Acceptable Action."

From: United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service
To: NTSB
Date: 11/17/1997
Response: Since our initial response to this Safety Recommendation, there have been two significant changes affecting NWS aviation services in Alaska. As of January 1, 1996, the aviation forecast responsibility for Alaska was consolidated in the Alaska Aviation Weather UNIT (AAWU). AAWU meteorologists are fully dedicated to providing warnings to the aviation community. During the same period, the WSR-88D system became operational. The WSR-88D facility at Kenai, Alaska, is routinely used by the AAWU meteorologists to discriminate area of potentially hazardous turbulence induced by the Chugach Mountain Range and has enhanced the capability to provide accurate and timely warnings of severe turbulence in the Anchorage bowl. Additionally, the NWS has been working with the University of Alaska (at Fairbanks) and the Research Applications Program, National Center for Atmospheric Research, in efforts to investigate severe turbulence events along the Chugach Mountain Range. Output developed from a mesoscale model based on data surrounding the Evergreen accident was extremely beneficial. The gained information has been incorporated into daily AAWU operations.

From: United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service
To: NTSB
Date: 7/31/1997
Response: This is to acknowledge receipt of your letter of June 2, 1997, concerning the National Transportation Safety Board's Safety Recommendations A-86-79, A-86-81, A-93-142, and A-95-52. These recommendations resulted from various carrier accidents occurring from 1985 through 1994, namely, the Delta Air Lines Flight 191 crash at Dallas/Fort Worth, Texas (August 2, 1985); the Evergreen International Airlines Flight 46E accident at Anchorage, Alaska (March 31, 1993); and the USAir Flight 1016 crash at Charlotte, North Carolina (July 2, 1995). As indicated in your letter, the National Weather Service has previously responded to all of the Safety Recommendations. So that each recommendation gets the.attention it deserves, we will need additional time to review the cases'listed above. Accordingly, as discussed in the July 25th telephone conversation between Mr. James Daneher of your staff and Mr. Robert Kuessner of this office, we expect to provide you with a coordinated response on each of the Safety Recommendations September 30, 1997.

From: NTSB
To: United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service
Date: 6/2/1997
Response: OUR RECORDS INDICATE THAT ALTHOUGH THE BOARD INITIALLY RECEIVED A REPONSE FROM YOUR AGENCY CONCERNING THESE RECOMMENDATIONS, WE HAVE NOT SINCE RECEIVED ACKNOWLEDGMENT THAT THSE RECOMMENDATIONS HAS BEEN IMPLEMENTED. IF WE DO NOT RECEIVE A RESPONSE FROM YOU WITHIN 45 DAYS, THIS RECOMMENDATION WILL BE CLASSIFIED "CLOSED--UNACCEPTABLE ACTION."

From: NTSB
To: United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service
Date: 4/25/1994
Response: THE BOARD NOTES THAT THE ANCHORAGE WEATHER SERVICE FORECAST OFFICE (WSFO), IN CONJUCTION WITH THE UNIVERSITY OF ALASKA, HAS INITIATED A COMPREHENSIVE STUDY TO INVESTIGATE SEVERE TURBULENCE EVENTS ALONG THE CHUGACH MOUNTAIN RANGE. ADDITIONALLY, THE NATIONAL CENTER FOR ATMOSPHERIC RESEARCH'S RESEARCH APPLICATIONS PROGRAM WILL FOCUS ON THE WSR-88D CAPABILITIES FOR ASSISTING IN THE DETECTION, MONITORING, & FORECASTING OF SEVERE TURBULENCE ALONG THE CHUGACH MOUNTAIN RANGE. PLEASE KEEP THE BOARD INFORMED OF ANY SIGNIFICANT DEVELOPMENTS IN THESE AREAS. PENDING FURTHER INFO CONCERNING THE WSR-88D DOPPLER WEATHER RADAR SYSTEM, THE BOARD CLASSIFIES A-93-142 "OPEN--ACCEPTABLE RESPONSE."

From: United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service
To: NTSB
Date: 2/22/1994
Response: THE ANCHORAGE WEATHER SERVICE FORECAST OFFICE (WSFO), IN CONJUCTION WITH THE UNIVERSITY OF ALASKA HAS INITIATED A COMPREHENSIVE STUDY TO INVESTIGATE SEVERE TURBULENCE EVENTS ALONG THE CHUGACH MOUNTAIN RANGE. ADDITIONALLY, THE NATIONAL CENTER FOR ATMOSPHERIC RESEARCH'S RESEARCH APPLICATIONS PROGRAM WILL FOCUS ON THE WSR-88D CAPABILITIES FOR DETECTING, MONITORING AND FORECASTING SEVERE TURBULENCE ALONG THE CHUGACH MOUNTAIN RANGE.