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Safety Recommendation Details

Safety Recommendation A-89-092
Details
Synopsis: ON FEBRUARY 24, 1989, UNITED AIRLINES, INC., (UAL), FLIGHT 811, A BOEING 747-122, N4713U, WITH 3 FLIGHT CREWMEMBERS, 15 CABIN CREWMEMBERS, AND 337 PASSENGERS ON BOARD, EXPERIENCED AN EXPLOSIVE DECOMPRESSION AS A RESULT OF THE IN-FLIGHT LOSS OF THE RIGHT FORWARD LOWER LOBE CARGO COMPARTMENT DOOR AND A PART OF THE RIGHT CABIN FUSELAGE. FLIGHT 811 WAS EN ROUTE FROM LOS ANGELES, CALIFORNIA, TO SYDNEY, AUSTRALIA (SYD) WITH INTERMEDIATE STOPS IN HONOLULU, HAWAII (HNL) AND AUCK LAND, NEW ZEALAND (AKL). IT WAS A REGULARLY SCHEDULED FLIGHT CONDUCTED UNDER THE PROVISIONS OF 14 CODE OF FEDERAL REGULATIONS (CFR) PART 121.
Recommendation: THE NTSB RECOMMENDS THAT THE FAA: ISSUE AN AIRWORTHINESS DIRECTIVE (AD) TO REQUIRE THAT THE MANUAL DRIVE UNITS AND ELECTRICAL ACTUATORS FOR BOEING 747 CARGO DOORS HAVE TORQUE LIMITING DEVICES TO ENSURE THAT THE LOCK SECTORS, MODIFIED PER AD-88-12-04, CANNOT BE OVERRIDDEN DURING MECHANICAL OR ELECTRICAL OPERATION OF THE LATCH CAMS.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Reconsidered
Mode: Aviation
Location: HONOLULU, HI, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA89MA027
Accident Reports: Explosive Decompression - Loss of Cargo Door in Flight, United Airlines Flight 811 Boeing 747-122, N4713U
Report #: AAR-92-02
Accident Date: 2/24/1989
Issue Date: 8/23/1989
Date Closed: 4/16/1990
Addressee(s) and Addressee Status: FAA (Closed - Reconsidered)
Keyword(s):

Safety Recommendation History
From: FAA
To: NTSB
Date: 11/3/1989
Response: The FAA evaluated this safety recommendation and has determined that Boeing 747 cargo doors with lock sectors, modified in compliance with Airworthiness Directive (AD) 88-12-04, cannot be overridden during mechanical or electrical operation of the latch cams because the latch cam actuators incorporate at least one torque-limiting device. Based on this information, the FAA does not plan to issue an AD as requested by this safety recommendation.