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Safety Recommendation Details

Safety Recommendation A-96-136
Details
Synopsis: ON 11/12/95, AT 0056 EASTERN TIME (EST), AMERICAN AIRLINES (AAL) FLIGHT 1572, A MCDONNELL DOUGLAS MD-80, REGISTERED IN THE UNITED STATES AS N566AA, STRUCK TREES ON A RIDGE LINE NORTHEAST OF THE AIRPORT, IN EAST GRANBY, CONNECTICUT, WHICH IS ABOUT 2.54 MILES FROM THE END OF RUNWAY 15, AT BRADLEY INTERNATIONAL AIRPORT (BDL) WINDSOR LOCKS, CONNECTICUT. THE TREE STRIKE OCCURRED DURING AN INSTRUMENT APPROACH TO RUNWAY 15 IN DARKNESS & IN VARIABLE WIND CONDITIONS. BOTH ENGINES SUBSEQUENTLY LOST POWER FOLLOWING INGESTION OF TREE LIMBS, BUT THE FLIGHTCREW WAS ABLE TO CONTINUE THE FLIGHT TO THE AIRPORT. THE AIRPLANE WAS SUBSTANTIALLY DAMAGED DURING THE EMERGENCY LANDING. ONE OF THE 72 PASSENGERS RECEIVED A MINOR INJURY DURING THE EMERGENCY EVACUATION, & NONE OF THE FIVE CREWMEMBERS WAS INJURED IN THE ACCIDENT. THE FLIGHT, WHICH WAS OPERATING UNDER 14 CODE OF FEDERAL REGULATIONS PART 121, ORIGINATED AT O"HARE INTERNATIONAL AIRPORT, CHICAGO, ILLINOIS, ABOUT 2 HOURS BEFORE THE ACCIDENT.
Recommendation: THE NTSB RECOMMENDS THAT THE FAA: DEVELOP A PLAN TO PHYSICALLY CHECK & CORRECT LOW LEVEL WINDSHEAR ALERT SYSTEM (LLWAS) WIND SENSOR ALIGNMENT IN A TIMELY MANNER.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: EAST GRANBY, CT, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA96MA008
Accident Reports: Collision with Trees on Final Approach American Airlines Flight 1572, McDonnell Douglas MD-83, N566AA
Report #: AAR-96-05
Accident Date: 11/12/1995
Issue Date: 12/3/1996
Date Closed: 11/17/1998
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s): Low Level Windshear, Weather, Wind

Safety Recommendation History
From: NTSB
To: FAA
Date: 11/17/1998
Response: A-96-136 ASKED THE FAA TO DEVELOP A PLAN TO PHYSICALLY CHECK & CORRECT LOW-LEVEL WINDSHEAR ALERT SYSTEM (LLWAS) WIND SENSOR ALIGNMENT IN A TIMELY MANNER. THESE ACTION ADDRESS THE INTENT OF A-96-136. THEREFORE THE RECOMMENDATION IS CLASSIFIED "CLOSED--ACCEPTABLE ACTION."

From: FAA
To: NTSB
Date: 8/17/1998
Response: (Letter Mail Controlled 8/24/98 4:42:07 PM MC# 981053) THE FAA HAS REDUCED BOTH THE INTERVAL BETWEEN CHECKS OF LOW LEVEL WIND SHEAR ALERT SYSTEM (LLWAS), WIND SENSOR ACCURACY & THE AMOUNT OF TIME BETWEEN THE IDENTIFICATION OF AN ALIGNMENT PROBLEM & ITS CORRECTION. ON 12/15/97, THE FAA ISSUED CHANGE 8 TO ORDER 6560.13D, MAINTENANCE OF AVIATION METEOROLOGICAL SYSTEMS & MISCELLANEOUS AIDS. PAGE 18, ITEM 30-1, REQUIRES THAT A DATA DUMP TO MAGNETIC TAPE BE ACCOMPLISHED ON LLWAS-2 EQUIPMENT (EXCEPT THOSE INTERFACED WITH A TERMINAL DOPPLER WEATHER RADAR) EVERY 30 DAYS. THE DATA DUMP WAS PREVIOUSLY REQUIRED EVERY 90 DAYS. THE MAGNETIC TAPE IS ANALYZED & USED AS THE BASIS FOR A MONTHY REPORT OF LLWAS PERFORMANCE. THE REPORT DOCUMENTS THE ANALYSIS PERIOD, POSSIBLE PROBLEM AREAS, AIRPORT & TAPE IDENTIFICATIONS, & AFFECTED STATIONS & SECTORS. THE REPORT IS PROVIDED TO THE APPROPRIATE FAA OFFICE RESPONSBILE FOR THE MAINTENANCE OF THE EQUIPMENT WITH INSTRUCTIONS THAT NOTIFICATION OF CORRECTION ACTION MUST BE RECEIVED WITHIN 30 DAYS.

From: NTSB
To: FAA
Date: 6/26/1997
Response: A-96-136 ASKED THE FAA TO DEVELOP A PLAN TO PHYSICALLY CHECK & CORRECT LOW LEVEL WINDSHEAR ALERT SYSTEM (LLWAS) WIND SENSOR ALIGNMENT IN A TIMELY MANNER. PENDING THE REVISION OF THE REPORTING & ERROR CORRECTION PROCEDURES, A-96-136 IS CLASSIFIED "OPEN--ACCEPTABLE RESPONSE."

From: FAA
To: NTSB
Date: 2/24/1997
Response: DEVELOP A PLAN TO PHYSICALLY CHECK & CORRECT LOW LEVEL WINDSHEAR ALERT SYSTEM (LLWAS) WIND SENSOR ALIGNMENT IN TIMELY MANNER.