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Safety Recommendation Details

Safety Recommendation A-77-068
Details
Synopsis: THE NATIONAL TRANSPORTATION SAFETY BOARD HAS NOTED WITH CONCERN YOUR RECENT ISSUANCE OF AMENDMENT 121-134, ADDITIONAL WEATHER INFORMATION, TO THE FEDERAL AVIATION REGULATIONS. AS YOU KNOW, THIS AMENDMENT REQUIRES THAT DOMESTIC AND FLAG AIR CARRIERS ADOPT AN APPROVED SYSTEM FOR OBTAINING FORECASTS AND REPORTS OF ADVERSE WEATHER CONDITIONS THAT MAY AFFECT SAFETY OF FLIGHT WHILE EN ROUTE AND AT EACH AIRPORT TO BE USED. PRIOR TO A FLIGHT, THE AIRCRAFT DISPATCHER WOULD BE REQUIRED TO PROVIDE THE PILOT-IN-COMMAND WITH ALL AVAILABLE WEATHER REPORTS AND FORECASTS OF WEATHER CONDITIONS FOR EACH ROUTE TO BE FLOWN AND EACH AIRPORT TO BE USED. DURING A FLIGHT, THE AIRCRAFT DISPATCHER WOULD BE REQUIRED TO PROVIDE THE PILOT-IN-COMMAND WITH ANY ADDITIONAL AVAILABLE INFORMATION OF METEOROLOGICAL CONDITIONS THAT MIGHT AFFECT SAFETY OF FLIGHT.
Recommendation: FORMULATE RULES AND PROCEDURES FOR THE TIMELY DISSEMINATION BY AIR TRAFFIC CONTROLLERS OF ALL AVAILABLE SEVERE WEATHER INFORMATION TO INBOUND AND OUTBOUND FLIGHTCREWS IN THE TERMINAL AREA.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: New Hope, GA, United States
Is Reiterated: Yes
Is Hazmat: No
Is NPRM: No
Accident #: DCA77AA015
Accident Reports: Southern Airways, Inc., DC-9-31, N1335U
Report #: AAR-78-02
Accident Date: 4/4/1977
Issue Date: 10/28/1977
Date Closed: 4/17/1981
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s): Air Traffic Control, Weather, Weather Equipment/Products/Reports

Safety Recommendation History
From: NTSB
To: FAA
Date: 4/17/1981
Response: The ntsb agrees that the introduction of the cwsus and the llwsas are responsive to a-77-68. Consequently, we shall list this recommendation as closed--acceptable action. While closing this recommendation, however, we urge that you continue to monitor and refine the cwsus and llwsass to assure that the facilities and procedures involved are adequate to meet the requirements. As you know, our investigation of the air wisconsin accident near valley, nebraska, on june 12, 1980, revealed that available sever weather informa-tion in theminneapolis artcc (wmp artcc) was not disseminated to the crew of the air wisconsin flight. This was the case even though a cwsu was in place and operational at the zmp artcc at the time. Similarly, in our investigation of the eastern airlines b-727 incident at the atlanta hartsfield international airport on august 12, 1979, we found that the llwsas installed at the airport has several shortcomings. In view of the above, we would appreciate your keeping us informed of actions taken or contemplated to improve the cwsu and low-level wind shear alert programs.

From: FAA
To: NTSB
Date: 4/7/1981
Response: FAA LTR: CURRENTLY, THE FAA HAS 21 CENTER WEATHER SERVICE UNITS (CWSU) IN PLACE AND OPERATIONAL WITH PROCEDURES ESTABLISHED TO DISSEMINATE WEATHER INTELLIGENCE TO TERMINAL FACILITIES WITHIN THE ARTCC'S AREA OF RESPONSIBILITY. ADDITIONALLY, WE HAVE, IN PROGRESS, TWO PROGRAMS DESIGNED TO PROVIDE A MORE TIMELY METHOD OF WEATHER DISSEMINATION. IN THE INTERIM, WE HAVE AUTHORIZED ALL REGIONS TO SUPPLEMENT HANDBOOK 7210.2, PARAGRAPHS 820C AND 1220B, SIGNIFICANT METEOROLOGICAL INFORMATION (SIGMET) DISSEMINATION, WHEN THE SHARING OF SOME SIGMET RESPONSIBILITY TO OTHER AIR TRAFFIC FACILITIES WOULD ASSIST IN A MORE TIMELY DISSEMINATION OF SIGMET'S. WE HAVE ALSO TASKED THE REGIONS TO REVIEW THEIR RESPECTIVE CENTER SIGMET DISSEMINATION PROCEDURES FOR WAYS TO REDUCE DELAYS AND TO ENSURE THE TIMELY DISTRIBUTION OF SIGMET INFORMATION.

From: NTSB
To: FAA
Date: 12/9/1980
Response: From the aircraft accident report of Air Wisconsin, Inc. Swearingen SA-226 Metro, N650S in Valley, Nebraska on June 12, 1980. The Board adopted this report on 12/9/1980. As a result of this investigation, the Safety Board reiterates the following recommendations: A-75-51, A-77-63, A-77-68, and A-78-1.

From: FAA
To: NTSB
Date: 8/13/1980
Response: FAA LTR: WE ARE CONFIDENT THAT THE INTRODUCTION OF THE CWSU'S AND THE LOW LEVEL WIND SHEAR ALERT SYSTEMS ARE RESPONSIVE TO AND SATISFY RECOMMENDATION A-77-68.

From: NTSB
To: FAA
Date: 6/6/1980
Response: Your response (1/11/78) indicated that the faa had a draft plan for analyzing and disseminating severe weather data in terminal system areas and that the final plan would include a means of delivery that could be accomplished without derogating the controllers' primary responsibility for preventing midair collisions. We were subsequently advised through staff sources that the draft report mentioned in your letter of january 11, 1978, had been approved and that an faa weather program manager had been established to execute formation and public docket record, we would now like to be advised of the present status of this recommendation.

From: FAA
To: NTSB
Date: 1/11/1978
Response: FAA LTR: THE FAA HAS A DRAFT PLAN FOR ANALYZING AND DISSEMINATING SEVERE WEATHER DATA IN TERMINAL AREAS. THE FINAL PLAN WILL INCLUDE A MEANS OF DELIVERY THAT CAN BE ACCOMPLISHED WITHOUT DEROGATING THE CONTROLLERS' PRIMARY RESPONSIBILITY WHICH IS THE PREVENTION OF MIDAIR COLLISIONS.