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Safety Recommendation Details

Safety Recommendation A-83-020
Details
Synopsis: ON JULY 9, 1982, PAN AMERICAN WORLD AIRWAYS FLIGHT 759 CRASHED AFTER TAKING OFF FROM RUNWAY 10 AT NEW ORLEANS INTERNATIONAL AIRPORT, KENNER, LOUISIANA. WHEN FLIGHT 759 TOOK OFF, THERE WERE ISOLATED HEAVY SHOWERS OVER THE AIRPORT AND TO THE EAST OF THE AIRPORT ALONG THE AIRPLANE'S INTENDED DEPARTURE PATH. LOW LEVEL WIND SHEAR CONDITIONS HAD BEEN DETECTED BY THE AIRPORT'S LOW LEVEL WIND SHEAR ALERT SYSTEM (LLWSAS), AND THE SYSTEM HAD ALARMED SEVERAL TIMES, THE LAST TIME ABOUT 4 MINUTES BEFORE FLIGHT 759'S TAKEOFF. THE SYSTEM WAS NOT ALARMING AT THE TIME THE TAKEOFF CLEARANCE WAS ISSUED; HOWEVER, A WIND SHEAR ADVISORY WAS BROADCAST 2 SECONDS AFTER THE ACCIDENT.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: MAKE THE NECESSARY CHANGES TO DISPLAY LOW LEVEL WIND SHEAR ALERT SYSTEM WIND OUTPUT DATA AS LONGITUDINAL AND LATERAL COMPONENTS TO THE RUNWAY CENTERLINE.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Kenner, LA, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA82AA028
Accident Reports: Pan American World Airways, Inc., Clipper 759, Boeing 727-235, N4737
Report #: AAR-83-02
Accident Date: 7/9/1982
Issue Date: 3/25/1983
Date Closed: 6/18/1990
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s): Low Level Windshear, Weather, Wind

Safety Recommendation History
From: NTSB
To: FAA
Date: 6/18/1990
Response: (PER GREEN SHEET A-90-83 THRU -85) The Safety Board acknowledges the successful demonstration of the enhanced LLWAS at Denver Stapleton Airport. The enhanced LLWAS uses a display in the air traffic control tower to provide controllers with runway- Data Source: NTSB Recommendations to FAA and FAA Responses oriented wind components and with microburst and windshear warnings. The FAA intends to modify 17 systems to this configuration. The Safety Board understands that about $50 million would be required to upgrade the remaining systems to the expanded sensor network needed to provide component wind analysis. The Safety Board urges the FAA to review other airports served by air carrier aircraft in microburst- probable areas to establish priorities for additional installations. Particular consideration should be given to those airports not scheduled for TDWR coverage. (Recommendation A-83-20, issued March 25, 1983, is reclassified as "Closed-- Acceptable Action.")

From: FAA
To: NTSB
Date: 10/27/1988
Response:

From: FAA
To: NTSB
Date: 5/26/1988
Response: The LLWAS at Denver Stapleton International Airport was expanded to incorporate additional sensors, new controller displays, and modified software. Based on a series of computer simulations and analyses coupled with recommendations from a Government-industry advisory group, new formats and products were developed for the LLWAS at Denver Stapleton International Airport. The expanded LLWAS was operationally tested in the summer of 1987 and was commissioned in January 1988. The expanded system provides longitudinal wind components expressed in speed loss or gain. Additionally, the system allows the controller to advise the pilot on the type and location of wind shear in protected zones. A program has been established to upgrade all of the current LLWAS locations. I believe that this action is fully responsive to this safety recommendation, and I plan no further additional actions. I urge the Safety Board to classify this safety recommendation as "closed."

From: FAA
To: NTSB
Date: 9/16/1986
Response:

From: NTSB
To: FAA
Date: 9/16/1986
Response: In the course of the Safety Board's investigation of an accident involving Delta Air Lines flight 191 at Dallas/Fort Worth International Airport, Texas, on August 2, 1985, the Safety Board has performed a detailed review of all Safety Recommendations, currently classified as open, issued to the FAA on the subject of windshear. Also addressed in this review were three Safety Recommendations that discussed the timely detection of severe weather, though not specifically related to windshear or microbursts. The Safety Board's review included past FAA responses, evaluation of the FAA's letters of September 24, 1985, and May 5, 1986, and our analysis of the FAA's Integrated Wind Shear Program Plan. A more descriptive review of the FAA's responses to these Safety Recommendations and of the program plan is contained in appendix H of the Safety Board's report of the Delta flight 191 accident. The open Safety Recommendations reviewed by the Safety Board are as follows: A-74-13 A-76-34 A-77-63 A-80-118 A-83-15 A-83-18 A-83-19 A-83-20 A-83-21 A-83-22 A-83-23 A-83-24 A-83-25 A-85-26 A-85-27 The Safety Board has carefully reviewed the Integrated Wind Shear Program Plan and the two letters from the FAA mentioned above and finds that the actions concurrently being taken and planned by the FAA will comply with the intent of all of the above Safety Recommendations when implemented. Therefore, all of the above-listed Safety Recommendations have been classified as "Open--Acceptable Action" pending completion of the FAA's planned actions. The Safety Board appreciates the FAA's actions to improve windshear detection and avoidance, and in the dissemination of information on windshear.

From: NTSB
To: FAA
Date: 10/1/1985
Response: We are pleased to note that the FAA Technical Center is examining the feasibility of modifying LLWAS to display output data as longitudinal and lateral components to the runway center line. Pending the FAA's further response to this recommendation, it has been classified as "Open--Acceptable Action."

From: FAA
To: NTSB
Date: 4/2/1985
Response: FAA LTR: THE FAA TECHNICAL CENTER IS EXAMINING THE CAPABILITY OF LLWAS TO OUTPUT AS LONGITUDINAL AND LATERAL COMPONENTS TO THE RUNWAY CENTER LINE. AFTER THE DATA IS EXAMINED, A DECISION WILL BE MADE AS TO IMPLEMENTING THIS TYPE OF REPORT WITH THE LLWAS. WE ANTICIPATE THAT THIS DECISION WILL BE MADE BEFORE JULY 1, 1985.

From: NTSB
To: FAA
Date: 5/29/1984
Response: The planned evaluation by the FAA of various displays of wind sensor information during the New Orleans International Airport test program is responsive to this recommendation. Pending the review of the results of this evaluation by the Safety Board, Safety Recommendation A-83-20 will be maintained in an "Open--Acceptable Action" status.

From: FAA
To: NTSB
Date: 7/21/1983
Response: FAA LETTER: AN EVALUATION PROGRAM WILL BE CONDUCTED USING AN ENHANCED LLWSAS AT NEW ORLEANS AIRPORT. AS PART OF THIS PROGRAM, FAA WILL EVALUATE VARIOUS DISPLAYS OF WIND SENSOR INFORMATION. THE CURRENT STUDY ON WIND SHEAR BEING CONDUCTED BY THE NATIONAL ACADEMY OF SCIENCE IS ALSO EXAMINING POSSIBLE IMPROVEMENTS TO THE LLWSAS. THE RESULTS OF THE NEW ORLEANS ENHANCED LLWSAS EVALUATION WILL BE USED TO DEFINE IMPROVEMENTS TO THE LLWSAS IN USE IN THE FIELD.