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Safety Recommendation Details

Safety Recommendation A-86-085
Details
Synopsis: ON AUGUST 2, 1985, AT 1805:52 CENTRAL DAYLIGHT TIME, DELTA AIR LINES (DELTA) FLIGHT 191, A LOCKHEED L-1011-385-1, N726DA, CRASHED WHILE APPROACHING TO LAND ON RUNWAY 17L AT THE DALLAS/FORT WORTH INTERNATIONAL (DFW) AIRPORT, TEXAS. WHILE PASSING THROUGH THE RAIN SHAFT BENEATH A THUNDERSTORM, FLIGHT 191 ENTERED A MICROBURST WHICH THE PILOT WAS UNABLE TO TRAVERSE SUCCESSFULLY. THE AIRPLANE STRUCK THE GROUND ABOUT 6,300 FEET NORTH OF THE APPROACH END OF RUNWAY 17L, HIT A CAR ON A HIGHWAY NORTH OF THE RUNWAY KILLING THE DRIVER, STRUCK TWO WATER TANKS ON THE AIRPORT, AND BROKE APART. EXCEPT FOR A SECTION OF THE AIRPLANE CONTAINING THE AFT FUSELAGE AND EMPENNAGE, THE REMAINDER OF THE AIRPLANE DISINTEGRATED DURING THE IMPACT SEQUENCE, AND A SEVERE FIRE ERUPTED DURING THE IMPACT SEQUENCE. OF THE 163 PERSONS ABOARD, 134 PASSENGERS AND CREWMEMBERS WERE KILLED; 26 PAS SENGERS AND 3 CABIN ATTENDANTS SURVIVED.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE TO CORRECT THE DESIGN DEFICIENCY OF HEATH TECHNA JUMPSEATS (PART NO. MPD 241100) THAT PERMIT THE SEATBELT WEBBING TO CHAFE AGAINST THE SEATPAN RETRACTION SPRING.
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 #: DCA85AA031
Accident Reports: Delta Air Lines, Inc., Lockheed L-1011-385-1, N726DA
Report #: AAR-86-05
Accident Date: 8/2/1985
Issue Date: 9/3/1986
Date Closed: 1/19/1989
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 1/19/1989
Response: Thank you for your letter in further response to the National Transportation Safety Board's Safety Recommendation A-86-85, concerning wear found on Heath Techna flight and jumpseat seatbelt webbing. The Safety Board finds that the airworthiness directive enclosed with your letter meets the requirements of Safety Recommendation A-86-85. We have, therefore, classified this safety recommendation as "Closed--Acceptable Action."

From: FAA
To: NTSB
Date: 9/1/1988
Response: ON JULY 21, 1988, THE FAA ISSUED AN AD APPLICABLE TO CERTAIN LOCKHEED MODEL L-1011-385 SERIES AIRPLANES. THIS AD REQUIRES PERIODIC INSPECTION OF FLIGHT ATTENDANT SEAT BELTS AND SHOULDER HARNESSES FOR ANY WEAR, FRAYING, OR STRETCHING OF THE BELT WEBBING. THE AD ALSO REQUIRES THE INSTALLATION OF SHROUDS TO REDUCE THE OCCURRENCE OF CHAFING OF THE BELT WEBBING AGAINST THE SEATPAN RETRACTION SPRING. I HAVE ENCLOSED A COPY OF THE AD FOR THE BOARD'S INFORMATION. I CONSIDER THE FAA'S ACTION COMPLETED AND PLAN NO FURTHER ACTION.

From: NTSB
To: FAA
Date: 4/25/1988
Response: The Safety Board is pleased to learn that the FAA has issued a Notice of Proposed Rulemaking (NPRM) (Docket No. 87-NM-140-AD) applicable to certain Lockheed Model L- 1011-385 series airplanes. This proposed airworthiness directive (AD) will require the inspection of restraint systems at flight attendant seats, removal of defective restraints, and the modification of the seat restraint and guide mechanism. The Safety Board is responding to this NPRM. Pending issuance of the AD, Safety Recommendation A-86-85 remains classified as "Open--Acceptable Action."

From: FAA
To: NTSB
Date: 3/17/1988
Response: THE FAA ISSUED A NPRM, DOCKET NO. 87-NM-140-AD, APPLICABLE TO CERTAIN LOCKHEED MODEL L-1011-385 SERIES AIRPLANES. THIS NPRM PROPOSES TO REQUIRE THE INSPECTION OF RESTRAINT SYSTEMS AT FLIGHT ATTENDANT SEATS, REMOVAL OF DEFECTIVE RESTRAINTS, AND THE MODIFICATION OF THE SEAT RESTRAINT AND GUIDE MECHANISM.

From: NTSB
To: FAA
Date: 8/21/1987
Response: The Safety Board is pleased to learn that the FAA is in the process of developing a Notice of Proposed Rulemaking which will require the modification of the Heath Techna jumpseats in order to prevent chafing of the seatbelt webbing. Pending completion of the FAA's rulemaking effort, Safety Recommendation A-86-85 has been classified as "Open--Acceptable Action."

From: FAA
To: NTSB
Date: 7/16/1987
Response: THE FAA HAS COMPLETED ITS EVALUATION OF THE DESIGN OF HEALTH TECHNA JUMPSEATS AND HAS CONCLUDED THAT THE MODIFICATION OF THE JUMPSEAT IS APPROPRIATE AND NECESSARY TO PREVENT CHAFING OF THE SEATBELT WEBBING. UPON APPROVAL OF A DESIGN CHANGE, THE FAA WILL ISSUE A NOTICE OF PROPOSED RULEMAKING PROPOSING TO MAKE THE MODIFICATION MANDATORY.

From: NTSB
To: FAA
Date: 3/19/1987
Response: It is the Safety Board's opinion that the installation of occupant restraints in combination with the Heath Techna jumpseats leads to unacceptable chafing of the seatbelt webbing against the seatpan retraction spring. While an Airworthiness Directive applicable solely to the Heath Techna jumpseat may not be appropriate, it would appear that an AD applicable to the Lockheed L-1011 restraint system jumpseat design would be an appropriate course of action. Therefore, the Safety Board believes that the results of the FAA's evaluation of possible corrective actions to prevent the seatbelt webbing from chafing against the seatpan retraction spring of the Heath Techna jumpseats should lead to the creation of an AD. Pending further correspondence on this issue, Safety Recommendation A-86-85 has been classified as "Open--Unacceptable Action."

From: FAA
To: NTSB
Date: 11/18/1986
Response: THE FAA AGREES WITH THE INTENT OF THIS RECOMMENDATION, BUT DOES NOT BELIEVE THAT AN AIRWORTHINESS DIRECTIVE IS REQUIRED. THE FAA IS CURRENTLY EVALUATING THE DESIGN AND INSTALLATION OF THE HEATH TECHNA JUMPSEATS, AND HAS ESTABLISHED THAT THE SEATBELT IS NOT PART OF THE TYPE DESIGN OF THE JUMPSEAT. INSTEAD, IT IS INSTALLED BY THE AIRPLANE MANUFACTURER AT THE TIME OF SEAT INSTALLATION. FOR THIS REASON, AN AD APPLICABLE TO THE HEATH TECHNA JUMPSEAT IS NOT APPROPRIATE. THE FAA WILL, HOWEVER, EVALUATE POSSIBLE CORRECTIVE ACTIONS ON THE PART OF THE AIRPLANE MANUFACTURER.