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Safety Recommendation Details

Safety Recommendation A-89-126
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: ISSUE AN AIRWORTHINESS DIRECTIVE TO REQUIRE MODIFICATION OF THE TAKEOFF WARNING SYSTEM IN THE BOEING 727 MODEL AIRPLANES BASED UPON THE RESULTS OF THE DIRECTED ENGINEERING STUDY.
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: 12/11/1991
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 12/11/1991
Response: The Safety Board notes that the FAA has issued AD 90-03-18, effective March 7, 1990. This AD addresses nuisance (false) warnings during reduced engine taxi and requires that the takeoff configuration warning system (TOCWS) be modified to include engine pressure ratio logic information in series with the existing throttle angle arming logic. The FAA also issued AD 88-22-09 effective November 10, 1988, mandating that an operational and functional check be performed on the TOCWS at intervals not to exceed 200 flight hours. Based on the above information, Safety Recommendation A- 89-126 is classified "Closed--Acceptable Action." However, the Safety Board requests a copy of Advisory Circular 25.703-1, which will provide guidance material for the design and approval of future TOCWSs.

From: FAA
To: NTSB
Date: 6/17/1991
Response: THE FAA ISSUED AD 90-03-18, EFFECTIVE 3/7/90, TO ADDRESS NUISANCE (FALSE) WARNINGS DURING REDUCED ENGINE TAXI. THIS AD REQUIRES THAT THE TAKEOFF CONFIGURATION WARNING SYSTEM (TOCWS) BE MODIFIED TO INCLUDE ENGINE PRESSURE RATIO LOGIC INFORMATION IN SERIES WITH THE EXISTING THROTTLE ANGLE ARMING LOGIC. THE FAA ALSO ISSUED AD 88-22-09, EFFECTIVE 11/10/88, TO MANDATE THAT AN OPERATIONAL AND FUNCTIONAL CHECK BE PERFORMED ON THE TOCWS AT INTERVALS NOT TO EXCEED 200 FLIGHT HOURS. THIS ESSENTIALLY CUT IN HALF THE 400-HOUR "A" CHECK RECOMMENDED BY THE BOEING COMPANY FOR THE BOEING 727 SERIES AIRPLANES.

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: 4/12/1990
Response: "THE FAA ISSUED AD 90-03-18 (DOCKET NO. 88-NM-158), EFFEC TIVE MARCH 7, 1990. THIS AD ADDRESSES NUISANCE (FALSE) WARNINGS DURING REDUCED ENGINE TAXI, AND REQUIRES THAT THE TOCWS BE MODIFIED TO INCLUDE ENGINE PRESSURE RATIO LOGIC INFORMATION IN SERIES WITH THE EXISTING THROTTLE ANGLE LOGIC. THE FAA ALSO ISSUED AD-88-22-09 EFFECTIVE NOVEMBER 10, 1988, MANDATING THAT AN OPERATIONAL AND FUNCTIONAL CHECK BE PERFORMED ON THE TOCWS AT INTERVALS NOT TO EXCEED 200 FLIGHT HOURS. AS AN ENCHANCEMENT TO THE AD'S MENTIONED ABOVE, THE FAA RECENTLY DRAFTED AC 25.703-1, "TAKEOFF CONFIGURATION WARNING SYSTEM," WHICH PROVIDES GUIDANCE MATERIAL FOR THE DESIGN AND APPROVAL OF FUTURE TOCWS'S."