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Safety Recommendation Details

Safety Recommendation A-79-041
Details
Synopsis: THE NATIONAL TRANSPORTATION SAFETY BOARD INVESTIGATION OF THE AMERICAN AIRLINES DC-10 ACCIDENT AT CHICAGO'S O'HARE INTERNATIONAL AIRPORT ON MAY 25, 1979, HAS DISCLOSED THAT THE NO. 1 ENGINE AND PYLON SEPARATED FROM THE AIRCRAFT DURING THE TAKEOFF ROLL. ALTHOUGH THE EXACT TRAJECTORY OF THE ENGINE AFTER SEPARATION HAS NOT BEEN DETERMINED, THE EVIDENCE INDICATES THAT THE ENGINE AND PYLON ROTATED UP AND OVER THE WING.
Recommendation: ISSUE IMMEDIATELY AN EMERGENCY AIRWORTHINESS DIRECTIVE TO INSPECT ALL PYLON ATTACH POINTS ON ALL DC-10 AIRCRAFT BY APPROVED INSPECTION METHODS. (URGENT)
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Chicago, IL, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA79AA017
Accident Reports: American Airlines, Inc., DC-10, N110AA
Report #: AAR-79-17
Accident Date: 5/25/1979
Issue Date: 5/27/1979
Date Closed: 9/27/1979
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 9/27/1979
Response: We note that on may 23, 1979, the faa issued a telegraphic ad requiring actions to ensure the integrity of the wing engine pylon to wing attachment. We also note that on may 29, 1979, and June 4, 1979, the faa issued telegraphic amendments to this AD requiring additional inspections. We further note that on June 11, 1979, the FAA issued genot n8320.234 directing principal maintenance inspectors to review pylon and wing attach area inspection procedures of their assigned operators. We consider FAA's actions to be fully responsive to recommendation A-79-41, which is now classified as Closed--Acceptable Action.

From: FAA
To: NTSB
Date: 8/23/1979
Response: FAA LTR: A TELEGRAPHIC AIRWORTHINESS DIRECTIVE (AD) REQUIRING THE RECOMMENDED INSPECTION WAS ISSUED MAY 28, 1979. AMENDMENTS TO THIS AD WERE ISSUED MAY 29 AND JUNE 4, 1979. WE BELIEVE THAT THIS AD COMPLIES WITH THE INTENT OF THE RECOMMENDATION. IN ADDITION, WE INITIATED A NUMBER OF OTHER ACTIONS. THESE INCLUDED INCREASED FAA MONITORING OF AD COMPLIANCE, GROUNDING U.S. REGISTERED DC-10 AIRPLANES, SUSPENSION OF THE DC-10 TYPE CERTIFICATE, ISSUANCE OF TWO ORDERS OF INVESTIGATION INVOLVING EVALUATION OF THE DC-10 MANUFACTURER'S TYPE CERTIFICATION DATA AND OPERATORS' AIRWORTHINESS PROCEDURES, AND ISSUANCE OF A SPECIAL FEDERAL AVIATION REGULATION PROHIBITING OPERATION OF FOREIGN REGISTERED DC-10 AIRPLANES FROM OPERATING IN U.S. AIRSPACE EXCEPT FOR NON-REVENUE DEPARTURES. ON JUNE 11, 1979, WE ISSUED GENOT N8320.234 DIRECTING PRINCIPAL MAINTENANCE INSPECTORS TO REVIEW PYLON AND WING ATTACH AREA INSPECTION PROCEDURES OF THEIR ASSIGNED OPERATORS, AND TO AMEND THE MAINTENANCE OPERATIONS SPECIFICATIONS TO REQUIRE INSPECTIONS OF THE BOEING 747, LOCKHEED 1011, AND THE A-300 ENGINE PYLONS.