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Safety Recommendation Details

Safety Recommendation A-72-097
Details
Synopsis: THE NATIONAL TRANSPORTATION SAFETY BOARD IS INVESTIGATING AN ACCIDENT INVOLVING AN AMERICAN AIRLINES MCDONNELL DOUGLAS DC-10-10, N103AA, WHICH OCCURRED SHORTLY AFTER TAKEOFF FROM DETROIT METROPOLITAN-WAYNE COUNTY AIRPORT ON JUNE 12, 1972. THE AFT LEFT-HAND CARGO DOOR OPENED WHILE THE AIRCRAFT WAS AT APPROXIMATELY 12,000 FEET. THE CABIN FLOOR OVER THIS CARGO COMPARTMENT THEN FAILED AS A RESULT OF DEPRESSURIZATION LOADING, AND THE FLOOR DROPPED PARTIALLY INTO THE CARGO COMPARTMENT. THIS DISPLACEMENT OF THE FLOOR CAUSED SERIOUS DISRUPTION OF THE CONTROL CABLES WHICH ARE ROUTED THROUGH THE FLOOR BEAMS TO THE EMPENNAGE CONTROL SYSTEMS AND THE ENGINE CONTROLS. WITH THE EXCEPTION OF THE RIGHT RUDDER PEDAL CABLE, ALL OF THE CABLES ON THE LEFT SIDE OF THE FUSELAGE BROKE. THE CABLE RUNS ON THE RIGHT SIDE WERE ALSO DAMAGED -- THE CABLE GUIDES TORE FROM THEIR ATTACHMENTS TO THE FLOOR BEAMS, AND THE CABLES WERE DEFLECTED DOWNWARD BY THE FLOOR STRUCTURE.
Recommendation: REQUIRE A MODIFICATION TO THE DC-10 CARGO DOOR LOCKING SYSTEM TO MAKE IT PHYSICALLY IMPOSSIBLE TO POSITION THE EXTERNAL LOCKING HANDLE AND VENT DOOR TO THEIR NORMAL DOOR LOCKED POSITIONS UNLESS THE LOCKING PINS ARE FULLY ENGAGED.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Windsor, On, Canada
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: CHI72AC099
Accident Reports: American Airlines, Inc., McDonnell Douglas DC-10-10, N103AA
Report #: AAR-73-02
Accident Date: 6/12/1972
Issue Date: 7/6/1972
Date Closed: 8/8/1972
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 6/1/1975
Response: Closed--Acceptable Action.

From: NTSB
To: FAA
Date: 12/11/1974
Response: The safety board is aware of your continued efforts toward modifying the dc-10 cargo compartment doors to insure the integrity of fuselage pressure containment. However, the safety board believes that critical control systems must be protected against a loss of cargo compartment pressurization, which may occur for any reason. Therefore, we are specifically interested in corrective actions to strengthen the passenger compartment floor, to vent or partially vent the aft cargo com- partment, and to isolate or otherwise protect critical systems which pass through the passenger compartment floor structure. The safety board would appreciate a status report on actions taken or contemplated by the FAA to implement Safety Recommendation A-72-98.

From: FAA
To: NTSB
Date: 7/7/1972
Response: 7/7/72 - RESPONSE FROM THE FAA TO SAY THAT OPERATORS OF DC-10-10 AIRPLANES ARE CURRENTLY PERFORMING 100 HOUR FUNCTIONAL CHECKS ON THE CARGO DOOR SYSTEM AND WILL INCORPORATE NECESSARY MODIFICATIONS IN ACCORDANCE WITH MCDONNELL DOUGLAS SERVICE BULLETINS 52-57 AND A52-35WITHIN 300 HOURS. THESE MODIFICATIONS PERTAIN TO IMPROVEMENTS IN THE INSPECTION AND OPERATION OF LOCKING AND VENT MECHANISMS. ADDITIONAL MODIFICATIONS TO THE CARGO DOOR LOCKING AND PRESSURIZATION SYSTEMS ARE BEING CONSIDERED AS PART OF A CONTINUED INVESTIGATION EFFORT. WHILE A PRELIMINARY INVESTIGATION INDICATES THAT IT MAY NOT BE FEASIBLE TO PROVIDE COMPLETE VENTING BETWEEN CABIN AND CARGO COMPARTMENTS, THE BOARD'S RECOMMENDATIONS WILL BE CONSIDERED WITH RESPECT TO FURTHER ACTION CONTEMPLATED. A-72-97 CLOSED