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Safety Recommendation Details

Safety Recommendation A-89-125
Details
Synopsis: ABOUT 0901 CENTRAL DAYLIGHT TIME ON AUGUST 31, 1988, DELTA AIR LINES, INC., FLIGHT 1141, CRASHED SHORTLY AFTER LIFTING OFF FROM RUNWAY 18L AT THE DALLAS-FORTH WORTH INTERNATIONAL AIRPORT (DFW), TEXAS. THE AIRPLANE, A BOEING 727-232, U.S. REGISTRY N473DA, WAS A REGULARLY SCHEDULED PASSENGER FLIGHT AND WAS EN ROUTE TO SALT LAKE CITY, UTAH.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: PERFORM A DIRECTED ENGINEERING STUDY OF THE TAKEOFF WARNING SYSTEM(S) IN THE BOEING 727 MODEL AIRPLANES, WITH SPECIAL EMPHASIS ON THE TAKEOFF WARNING SYSTEM THROTTLE SWITCH INSTALLATION. THE STUDY SHOULD EVALUATE THE RELIABILITY, MAINTAINABILITY, AND METHODS TO IMPROVE THE DESIGN OF THE SYSTEM.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: DALLAS/FT WORTH, TX, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA88MA072
Accident Reports: Delta Air Lines, Inc., Boeing 727-232, N473DA
Report #: AAR-89-04
Accident Date: 8/31/1988
Issue Date: 1/9/1990
Date Closed: 11/19/1990
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 11/19/1990
Response: The Safety Board notes that the FAA established a special team to study the TOCWS and as a result issued Airworthiness Directives (AD) 90-03-18 and 89-22-09. We trust that the actions required by the ADs will help prevent attempted takeoffs of airplanes in improper configurations and with takeoff systems inoperative. This safety recommendation is now classified as "Closed--Acceptable Action."

From: NTSB
To: FAA
Date: 10/22/1990
Response: Based on the FAA's action to issue an Airworthiness Directive (AD-90-03-18), Safety Recommendations A-89-125 and -126 are classified as "Open--Acceptable Response." The Safety Board awaits an update from the FAA about its review of the design features of the B-727 takeoff warning system and an opportunity to review the proposed Advisory Circular (AC) 25.703.1, which will provide guidance material for the design and approval of future takeoff warning systems.

From: FAA
To: NTSB
Date: 8/6/1990
Response: THE FAA ESTABLISHED A SPECIAL TEAM TO CONDUCT A STUDY OF THE TAKEOFF CONFIGURATION WARNING SYSTEMS (TOCWS) INSTALLED ON A NUMBER OF TRANSPORT CATEGORY AIRPLANE MODELS. THE STUDY INCLUDED A REVIEW OF THE DESIGNS OF TAKEOFF WARNING SYSTEMS, THE REGULATORY REQUIREMENTS, AND THE FAA POLICIES GOVERNING THE DESIGNS OF THESE SYSTEMS. THIS RECOMMENDATION RESULTED IN THE ISSUANCE OF AD 90-03-18 TO CORRECT NUISANCE WARNING DEFICIENCIES AND AD 88-22-09 TO CORRECT MAINTENANCE INTERVAL DEFICIENCIES. THE FAA ALSO FOUND THE 727 & 737 TOCWS THROTTLE SWITCH ASSEMBLIES TO EXHIBIT ACCEPTABLE RELIABILITY

From: FAA
To: NTSB
Date: 4/12/1990
Response: "THE FAA ESTABLISHED A SPECIAL TEAM TO CONDUCT A STUDY OF THE TAKEOFF CONFIGURATION WARNING SYSTEMS (TOCWS) INSTALLED ON A NUMBER OF TRANSPORT CATEGORY AIRPLANE MODELS.-- THE STUDY INCLUDED A REVIEW OF THE DESIGNS OF TAKEOFF WARNING SYSTEMS, THE REGULATORY REQUIREMENTS, AND THE FAA POLICIES GOVERNING THE DESIGNS OF THESE SYSTEMS. THIS RECOMMENDATION CULMINATED IN THE ISSUANCE OF AD 90-03-81. THE TEAM ALSO DETERMINED THAT, ALTHOUGH THE DESIGNS OF THE VARIOUS TOCW'S WERE FOUND TO BE ACCEPTABLE FROM THE PRESPECTIVE OF RELIABILITY, SOME OPERATORS' MAINTENANCE CHECK INTERVALS WERE EXCESSIVE FOR THE DESIGN OF THE SYSTEM. AD 89-22-09, WAS ISSUED TO CORRECT THIS DEFICIENCY. BASED ON THE ABOVE INFORMATION, THE FAA, IN CONJUCTION WITH THE BOEING COMPANY, WILL REVIEW THE DESIGN FEATURES ON THE BOEING 727 TAKEOFF WARNING SYSTEM THROTTLE SWITCH ASSEMBLY AND ITS ASSOCIATED MAINTENANCE MANUALS AND SERVICE BULLETINS. I WILL KEEP THE BOARD APPRISED."