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Safety Recommendation Details

Safety Recommendation A-74-041
Details
Synopsis: DURING ITS PRELIMINARY INVESTIGATION OF THE ACCIDENT INVOLVING TRANSWORLD AIRLINES, FLIGHT 742, ON AUGUST 28, 1973, THE NATIONAL TRANSPORTATION SAFETY BOARD SUBMITTED SAFETY RECOMMENDATIONS A-73-76THROUGH 78. IN YOUR INITIAL RESPONSE TO THESE RECOMMENDATIONS, YOU STATED THAT ADDITIONAL ACTION WOULD BE TAKEN AFTER THE INVESTIGATION WAS COMPLETED.
Recommendation: ISSUE AN AIRWORTHINESS DIRECTIVE WHICH: (A) SPECIFIES NEW TOLERANCES FOR THE VERTICAL DIMENSIONS OF THE BOEING 707/720 STABILIZER TO ELEVATOR FAIR AT THE ELEVATOR HINGE LINE; (B) DESCRIBES PROCEDURES FOR MEASURING AND ESTABLISHING PROPER DIMENSIONS; (C) REQUIRES THAT ALL BOEING 707/720 AIRCRAFT BE INSPECTED, AT THE NEXT SCHEDULED MAINTENANCE VISIT, FOR THE PROPER DIMENSIONAL RELATIONSHIP OF THE STABILIZER TO ELEVATOR FAIR AT THE ELEVATOR HINGE LINE IN ACCORDANCE WITH THE PROCEDURES ESTABLISHED, AND (D) REQUIRES THOSE AIRCRAFT FOUND TO HAVE AN OUT-OF-TOLERANCE CONDITION TO BE MODIFIED ACCORDINGTO PRESCRIBED PROCEDURES.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Los Angeles, CA, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: LAX74AL019
Accident Reports: Trans World Airlines, Inc., Boeing 707-331B, N8705T
Report #: AAR-74-08
Accident Date: 8/28/1973
Issue Date: 5/15/1974
Date Closed: 2/20/1975
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 2/20/1975
Response: Closed--acceptable action.

From: FAA
To: NTSB
Date: 5/22/1974
Response: RESPONSE FROM THE FAA TO SAY THAT AN AD COVERING THE FOLLOWING TECHNICAL AREAS IS CURRENTLY BEING PREPARED FOR EARLY ADOPTION: (A) NEW TOLERANCES FOR THE VERTICAL DIMENSIONS OF THE BOEING 707/720 STABILIZER TO ELEVATOR FAIR AT THE ELEVATOR HINGE LINE. (B) PROCEDURES FOR MEASURING AND ESTABLISHING PROPER DIMENSIONS. (C) REQUIREMENT FOR ALL BOEING 707/720 AIRCRAFT TO BE INSPECTED FOR THE PROPER DIMENSIONAL RELATIONSHIP OF THE STABILIZER TO ELEVATOR FAIR AT THE ELEVATOR HINGE LINE IN ACCORDANCE WITH THE ESTABLISHED PROCEDURES. THE TIME OF INSPECTION MAY NOT BE AT THE NEXT SCHEDULED MAINTENANCE VISIT, AS YOU RECOMMEND, SINCE THIS TIME DIFFERS BETWEENOPERATORS. HOWEVER, A TIME OF INSPECTION WILL BE ESTABLISHED TO ACHIEVE TIMELY COVERAGE, AND MAY BE EXPRESSED IN TERMS OF FLIGHT HOURS. (D) REQUIREMENT THAT THOSE AIRCRAFT FOUND TO HAVE AN OUT-OF- TOLERANCE CONDITION TO BE MODIFIED IN ACCORDANCE WITH PRESCRIBED PROCEDURES, AND WITHIN A SPECIFIED TIME PERIOD.(B) 10/30/74 - FAA ISSUED AN AD TO REQUIRE INSPECTION AND ADJUSTMENT OF BOEING 707/720 STABILIZERS.